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s-35199a01 www.sii-ic.com 3-wire real-time clock ? seiko instruments inc., 2007-2010 rev.2.0 _00 seiko instruments inc. 1 the s-35199a01 is a cmos 3-wire real-time clock ic which operat es with the very low current consumption and in the wide range of operation voltage. the operation voltage is 1.3 v to 5.5 v so that this ic can be used for various power supplies from main supply to backup battery. due to the 0.34 a current consumption and wide range of power supply voltage at time keeping, this ic makes the battery life longer. in the system which operates with a backup battery, the included free registers can be used as the function for user?s backup memory. users always can take back the information in the registers which is stored before power-off the main power supply, after the voltage is restored. this ic has the function to correct advance/ delay of the clock data speed, in the wide range, which is caused by the oscillatio n circuit?s frequency deviation. correcting according to the te mperature change by combining th is function and a temperature sensor, it is possible to make a high precise clock function whic h is not affected by the ambient temperature. this ic has the function for the external microcomputer?s sub clock to output the 32.768 khz clock pulse. and for this output, users can select either of nch open drain or cmos. moreover, this ic has a 24-bit binary up counter. this counter counts up every 60 sec from power-on so that users are able to grasp the elapsed time from power-on up to 30 years. ? features ? low current consumption : 0.34 a typ. (v dd = 3.0 v, ta = 25 c) ? wide range of operating voltage : 1.3 to 5.5 v ? built-in clock-correction function ? clock pulse output (cmos output, function to select frequency) ? 32.768 khz clock pulse output (nch open-drain, output control pin) ? built-in 24-bit binary up counter ? built-in free user register ? 3-wire (micro wire) cpu interface ? built-in alarm interrupter ? built-in flag generator during detection of low power voltage or at power-on ? auto calendar up to the year 2099, automatic leap year calculation function ? built-in constant voltage circuit ? built-in 32.768 khz crystal oscillator (c d built in, c g external) ? lead-free, halogen-free ? applications ? mobile game devices ? mobile av devices ? digital still cameras ? digital video cameras ? electronic power meters ? dvd recorders ? tvs, vcrs ? mobile phones, phs ? car navigation ? package ? wlp-12a
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 2 ? pin configuration d3 wlp-12a bottom view c3 b3 a3 d2 c2 b2 a2 d1 c1 b1 a1 vss xin xout vddl ctrl int fout sio sck vdd f32k cs (1.84 1.97 0.6 max) figure 1 ? marking specifications 1 01 (1) (2) 99a lot number top view figure 2 ? list of pin table 1 pin no. symbol descrip tion i/o configuration a1 vss gnd pin ? ? b1 xin c1 xout connection pin for crystal oscillator ? ? d1 vddl power supply pin for fout output ? ? a2 sio i/o pin for serial data bi-directional nch open-drain output (no protective diode at vdd) cmos input b2 ctrl control pin for f32k output input cmos input (built-in pull-down resistor. no protective diode at vdd) c2 int output pin for interrupt signal output nch open-drain output (no protective diode at vdd) d2 fout output pin for clock pulse signal output cmos output a3 cs input pin for chip select input cmos input (built-in pull-down resistor. no protective diode at vdd) b3 sck input pin for serial clock input cmos input (no protective diode at vdd) c3 vdd pin for positive power supply ? ? d3 f32k pin for 32.768 khz output output nch open-drain output (no protective diode at vdd)
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 3 ? pin function ? cs (input for chip select) pin this pin is to input chip select, has a pull-down resistor. communication is available when this pin is in ?h? level. if not using communication, set this pin ?l? or open. ? sio (i/o for serial data) pin this pin is to data input/output for serial interface. when the cs pin is in ?h?, the sio pin inputs/outputs data by synchronizing with a clock pulse from the sck pin. the status is in high impedance when the cs pin is in ?l? or open, so that the s-35199a01 does not transmit data. setting the cs pin to ?h? level from ?l? or open, this sio pin goes in the input status so that it receives the command data. this pin has cmos input and nch open drain output. ? sck (input for serial clock) pin this pin is to input a clock pulse for serial interface. when the cs pin is in ?h?, the sio pin inputs/outputs data by synchronizing with the clock pulse. when the cs pin is in ?l? or open, the sck pin does not accept inputting a clock pulse. ? xin, xout (crystal oscillator connect) pin connect a crystal oscillator between xin and xout. ? int (output for interrupt signal) pin this pin outputs a signal of interrupt, or a clock pulse. by using the status register 2, users can select either of; alarm 1 interrupt, alarm 2 interrupt, output of user-set frequency, per-minute edge interrupt, minute-periodical interrupt 1, minute-periodical interrupt 2, or 32.768 khz output. this pin has nch open drain output. ? ctrl (f32k output control) pin this pin is to control output from the f32k pin, has a pull-down resistor. this pin outputs a clock pulse from the f32k pin when the ctrl pin is in ?h?. it does not do so when the ctrl pin is in ?l? or open. set this ctrl pin to ?l? or open at power-on. to output 32.768 khz from the f32k pin, after power-on, set the ctrl pin to ?h? more than one sec after. ? f32k (32.768 khz output) pin this pin has the function to output-control, outputs 32.768 khz. when the ctrl pin is in ?h?, this pin outputs the 32.768 khz clock pulse, when the ctrl pin is in ?l? or open, the status is in high impedance. this pin has nch open drain output. ? fout (output for clock pulse signal) pin this pin is to output the clock pulse selected by users. users can select the frequency by using the fout setting register 1 and 2. this pin outputs ?l? at power-on. this pin has cmos output. ? vdd (positive power supply) pin connect this vdd pin with a positive power supply. regarding the values of voltage to be applied, refer to ? ? recommended operation conditions? . ? vddl (positive power supply for fout output) pin this pin is for positive power supply for the fout pin?s output. set the value of voltage to be applied as v ddl v dd . ? vss pin connect this vss pin to gnd.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 4 ? equivalent circuits of i/o pin sck figure 3 sck pin sio figure 4 sio pin cs, ctrl figure 5 cs pin, ctrl pin int, f32k figure 6 int pin, f32k pin fout vddl figure 7 fout pin and vddl pin
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 5 ? block diagram status register 1 sck cs l ow power supply voltage detector vdd vss comparator 1 second minute hour day of week day month year shift register serial interface int xin xout sio comparator 2 clock correction register divider, timing generator int controller 2 constant- voltage circuit status register 2 int register 2 24-bit binary up counter fout vddl oscillator fout setting register 1 fout setting register 2 real-time data register alarm expansion register 1 alarm expansion register 2 int register 1 int controller 1 f32k ctrl 32.768 khz controller free register power-on detection circuit figure 8
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 6 ? absolute maximum ratings table 2 parameter symbol applicable pin rating unit power supply voltage 1 v dd ? v ss ? 0.3 to v ss + 6.5 v power supply voltage 2 v ddl ? v ss ? 0.3 to v dd v input voltage v in sck , sio, cs, ctrl v ss ? 0.3 to v ss + 6.5 v output voltage 1 v out1 sio, int , f32k v ss ? 0.3 to v ss + 6.5 v output voltage 2 v out2 fout v ss ? 0.3 to v ddl v operating ambient temperature *1 t opr ? ? 40 to +85 c storage temperature t stg ? ? 55 to +125 c *1. conditions with no condensation or frost. condensation and frost cause short circuiting between pins, resulting in a malfunction. caution the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefor e not be exceeded under any conditions. ? recommended operation conditions table 3 (v ss = 0 v) parameter symbol conditions min. typ. max. unit power supply voltage 1 *1 v dd ta = ? 40 to +85 c 1.3 3.0 5.5 v power supply voltage 2 v ddl ta = ? 40 to +85 c 1.3 ? v dd v time keeping power supply voltage *2 v ddt ta = ? 40 to +85 c v det ? 0.15 ? 5.5 v crystal oscillator c l value c l ? ? 6 7 pf *1. the power supply voltage that allows communication under the conditions shown in table 8 of ? ? ac electrical characteristics? . *2. the power supply voltage that allows time keeping. for the relationship with v det (low power supply voltage detection voltage), refer to ? ? characteristics (typical data)? . ? oscillation characteristics table 4 (ta = 25 c, v dd = 3.0 v, v ss = 0 v, sp-t2a crystal oscillator (c l = 6 pf, 32.768 khz) manufactured by seiko instruments inc.) parameter symbol conditions min. typ. max. unit oscillation start voltage v sta within 10 seconds 1.1 ? 5.5 v oscillation start time t sta ctrl pin = ?l? or open ? ? 1 s ic-to-ic frequency deviation *1 ic ? ? 10 ? +10 ppm frequency voltage deviation v v dd = 1.3 to 5.5 v ? 3 ? +3 ppm/v external capacitance c g applied to xin pin ? ? 9.1 pf internal oscillation capacitance c d applied to xout pin ? 8 ? pf duty ratio duty applied when 32.768 khz is output from either int , f32k, or fout pin 40 ? 60 % *1. reference value
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 7 ? dc electrical characteristics table 5 dc characteristics (v dd = 3.0 v) (ta = ? 40 to + 85 c, v ss = 0 v, sp-t2a crystal oscillator (c l = 6 pf, 32.768 khz, c g = 9.1 pf) manufactured by seiko instruments inc.) parameter symbol applicable pin conditions min. typ. max. unit current consumption 1 i dd1 ? out of communication ? 0.34 0.97 a current consumption 2 i dd2 ? out of communication (when 32.768 khz is output from f32k pin or int pin) ? 0.60 1.47 a current consumption 3 i dd3 ? during communication ( sck = 100 khz) ? 5 8 a input current leakage 1 i izh sck , sio v in = v dd ? 0.5 ? 0.5 a input current leakage 2 i izl sck , sio v in = v ss ? 0.5 ? 0.5 a input current 1 i ih1 cs, ctrl v in = v dd 2 6 16 a input current 2 i ih2 cs, ctrl v in = 0.4 v 40 100 300 a input current 3 i ih3 cs, ctrl v in = 1.0 v ? 215 ? a output current leakage 1 i ozh sio, int , f32k v out1 = v dd ? 0.5 ? 0.5 a output current leakage 2 i ozl sio, int , f32k v out1 = v ss ? 0.5 ? 0.5 a input voltage 1 v ih sck , sio, cs, ctrl ? 0.8 v dd ? v ss + 5.5 v input voltage 2 v il sck , sio, cs, ctrl ? v ss ? 0.3 ? 0.2 v dd v output current 1 i ol1 int , f32k v out1 = 0.4 v 3 5 ? ma output current 2 i ol2 sio, fout v out1 = v out2 = 0.4 v 5 10 ? ma output current 3 i oh fout v out2 = v dd ? 0.4 v ? ? 1.5 ? 1 ma power supply voltage detection voltage v det ? ? 0.65 1 1.35 v
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 8 table 6 dc characteristics (v dd = 5.0 v) (ta = ? 40 to + 85 c, v ss = 0 v, sp-t2a crystal oscillator (c l = 6 pf, 32.768 khz, c g = 9.1 pf) manufactured by seiko instruments inc.) parameter symbol applicable pin conditions min. typ. max. unit current consumption 1 i dd1 ? out of communication ? 0.36 1.18 a current consumption 2 i dd2 ? out of communication (when 32.768 khz is output from f32k pin or int pin) ? 0.82 2.17 a current consumption 3 i dd3 ? during communication ( sck = 100 khz) ? 9.3 14 a input current leakage 1 i izh sck , sio v in = v dd ? 0.5 ? 0.5 a input current leakage 2 i izl sck , sio v in = v ss ? 0.5 ? 0.5 a input current 1 i ih1 cs, ctrl v in = v dd 8 16 50 a input current 2 i ih2 cs, ctrl v in = 0.4 v 40 150 350 a input current 3 i ih3 cs, ctrl v in = 2.0 v ? 610 ? a output current leakage 1 i ozh sio, int , f32k v out1 = v dd ? 0.5 ? 0.5 a output current leakage 2 i ozl sio, int , f32k v out1 = v ss ? 0.5 ? 0.5 a input voltage 1 v ih sck , sio, cs, ctrl ? 0.8 v dd ? v ss + 5.5 v input voltage 2 v il sck , sio, cs, ctrl ? v ss ? 0.3 ? 0.2 v dd v output current 1 i ol1 int , f32k v out1 = 0.4 v 5 8 ? ma output current 2 i ol2 sio, fout v out1 = v out2 = 0.4 v 6 13 ? ma output current 3 i oh fout v out2 = v dd ? 0.4 v ? ? 2.3 ? 1.5 ma power supply voltage detection voltage v det ? ? 0.65 1 1.35 v
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 9 ? ac electrical characteristics table 7 measurement conditions input pulse voltage v ih = 0.8 v dd , v il = 0.2 v dd input pulse rise/fall time 20 ns output determination voltage v oh = 0.8 v dd , v ol = 0.2 v dd output load 80 pf + pull-up resistor 10 k sio c = 80 pf v dd r = 10 k remark the power supplies of the ic and load have the same electrical potential. figure 9 output load circuit table 8 ac electrical characteristics (ta = ? 40 to +85 c) v dd *2 1.3 v v dd *2 3.0 v parameter symbol min. typ. max. min. typ. max. unit clock pulse width t sck 5 ? 250000 1 ? 250000 s setup time before cs rise t ds 1 ? ? 0.2 ? ? s hold time after cs rise t csh 1 ? ? 0.2 ? ? s input data setup time t isu 1 ? ? 0.2 ? ? s input data hold time t iho 1 ? ? 0.2 ? ? s output data definition time *1 t acc ? ? 3.5 ? ? 1 s setup time before cs fall t css 1 ? ? 0.2 ? ? s hold time after cs fall t dh 1 ? ? 0.2 ? ? s input rise/fall time t r , t f ? ? 0.1 ? ? 0.05 s *1. since the output format of the sio pin is nch open-drain output, output data definition time is determined by the values of the load resistance (r l ) and load capacity (c l ) outside the ic. therefore, use this value only as a reference value. *2. regarding the power supply voltage, refer to ? ? recommended operation conditions? .
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 10 sio t ds t csh t ds sck t dh t css t dh cs figure 10 timing diagram 1 during 3-wire communication input data 80% 20% t f t r t isu t iho t r , t f 20% 20% 80% 80% 80% 20% sck figure 11 timing diagram 2 during 3-wire communication output data 80% 20% 50% 50% 50% t sck t sck t acc 20% 80% 20% sck figure 12 timing diagram 3 during 3-wire communication
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 11 ? configuration of data communication 1. configuration of data communication after setting the cs pin ?h?, transmit the 4-bit code ?0110? or ?0111?, after that, transmit a 3-bit command and 1-bit read/write command. next, data is output or input from b7. regarding details, refer to ? ? serial interface? . code ?0110? is compatible with the sii s-35190a/192a as software. regarding details, refer to ?2. configuration of command? . command 0 1 1 0/1 c2 c1 c0 r / w code read/write bit b7 b6 b5 b4 b3 b2 b1 b0 1-byte data figure 13 data communication
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 12 2. configuration of command 13 types of command are available for the s-35199a01, the s-35199a01 does read/write the various registers by inputting these codes and commands. the s-35199a01 does not perform any operation with any codes and commands other than those below. table 9 list of command command data code c2 c1 c0 description b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 status register 1 access reset *1 24/12 sc0 *2 sc1 *2 int1 *3 int2 *3 bld *4 poc *4 0 0 1 status register 2 access int1fe int1me int1ae 32ke sc2 *2 sc3 *2 int2ae test *5 0 1 0 real-time data 1 access (year data to) y1 m1 d1 w1 h1 m1 s1 y2 m2 d2 w2 h2 m2 s2 y4 m4 d4 w4 h4 m4 s4 y8 m8 d8 ? *6 h8 m8 s8 y10 m10 d10 ? *6 h10 m10 s10 y20 ? *6 d20 ? *6 h20 m20 s20 y40 ? *6 ? *6 ? *6 pm/am m40 s40 y80 ? *6 ? *6 ? *6 ? *6 ? *6 ? *6 0 1 1 real-time data 2 access (hour data to) h1 m1 s1 h2 m2 s2 h4 m4 s4 h8 m8 s8 h10 m10 s10 h20 m20 s20 pm/am m40 s40 ? *6 ? *6 ? *6 int register 1 access (alarm time 1: week/hour/minute) (int1ae = 1, int1me = 0, int1fe = 0) w1 h1 m1 w2 h2 m2 w4 h4 m4 ? *6 h8 m8 ? *6 h10 m10 ? *6 h20 m20 ? *6 pm/am m40 a1we a1he a1me 1 0 0 int register 1 access (output of user-set frequency) (int1me = 0, int1fe = 1) 1 hz 2 hz 4 hz 8 hz 16 hz sc4 *2 sc5 *2 sc6 *2 1 0 1 int register 2 access (alarm time 2: week/hour/minute) (int2ae = 1) w1 h1 m1 w2 h2 m2 w4 h4 m4 ? *6 h8 m8 ? *6 h10 m10 ? *6 h20 m20 ? *6 pm/am m40 a2we a2he a2me 1 1 0 clock-correction register access v0 v1 v2 v3 v4 v5 v6 v7 0110 1 1 1 free register access f0 f1 f2 f3 f4 f5 f6 f7 0 0 0 up counter access *7 c64k c256 c1 c128k c512 c2 c256k c1k c4 c512k c2k c8 c1m c4k c16 c2m c8k c32 c4m c16k c64 c8m c32k c128 0 0 1 fout setting register 1 access 256 hz 512 hz 1 khz 2 khz 4 khz 8 khz 16 khz 32 khz 0 1 0 fout setting register 2 access 1 hz 2 hz 4 hz 8 hz 16 hz 32 hz 64 hz 128 hz 1 0 0 alarm expansion register 1 access (alarm time 1 : year/month/day) y1 m1 d1 y2 m2 d2 y4 m4 d4 y8 m8 d8 y10 m10 d10 y20 ? *6 d20 y40 a1ye ? *6 y80 a1me a1de 0111 1 0 1 alarm expansion register 2 access (alarm time 2 : year/month/day) y1 m1 d1 y2 m2 d2 y4 m4 d4 y8 m8 d8 y10 m10 d10 y20 ? *6 d20 y40 a2ye ? *6 y80 a2me a2de *1. write-only flag. the s-35199a01 initializes by writing ?1? in this register. *2. scratch bit. a r/w-enabled, user-free register. *3. read-only flag. valid only when using the alarm function. when the alarm time matches, this flag is set to ?1?, and it is cleared to ?0? when read. *4. read-only flag. ?poc? is set to ?1? when power is applied. it is cleared to ?0? when read. regarding ?bld?, refer to ? ? low power supply voltage detection circuit ?. *5. test bit for sii. be sure to set ?0? in use. *6. no effect by write. it is ?0? when read. *7. the up counter is a read-only register.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 13 ? configuration of register 1. real-time data register the real-time data register is a 7-byte register that stores the data of year, month, day, day of the week, hour, minute, and second in the bcd code. to write/read real-time data 1 access, transmit/receive the data of year in b7, month, day, day of the week, hour, minute, second in b0, in 7-byte. when you skip the procedure to access the data of year, month, day, day of the week, read/write real-time data 2 access. in this case, transmit/receive the data of hour in b7, minute, second in b0, in 3-byte. year data (00 to 99) month data (01 to 12) day data (01 to 31) hour data (00 to 23 or 00 to 11) minute data (00 to 59) second data (00 to 59) y80 y40 y4 y8 y10 y20 y2 y1 b7 b0 m1 m2 m4 m8 m10 0 0 0 d1 d2 d4 d8 d10 d20 0 0 w1 w2 w4 0 0 0 0 0 h1 h4 h8 h10 h20 h2 0 m1 s2 s4 s8 s10 s20 s40 0 m8 m10 m20 m40 0 m4 m2 am / pm s1 start bit of real-time data 2 data access start bit of real-time data 1 data access day of week data (00 to 06) b7 b0 b7 b0 b7 b0 b7 b0 b7 b0 b7 b0 figure 14 real-time data register
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 14 year data (00 to 99): y1, y2, y4, y8, y10, y20, y40, y80 sets the lower two digits in the western calendar year (00 to 99) and links together with the auto calendar function until 2099. example: 2053 (y1, y2, y4, y8, y10, y20, y40, y80) = (1, 1, 0, 0, 1, 0, 1, 0) month data (01 to 12): m1, m2, m4, m8, m10 example: december (m1, m2, m4, m8, m10, 0, 0, 0) = (0, 1, 0, 0, 1, 0 ,0 ,0) day data (01 to 31): d1, d2, d4, d8, d10, d20 the count value is automatically changed by the auto calendar function. 1 to 31: jan., mar., may, july, aug., oct., dec., 1 to 30: april, june, sep., nov. 1 to 29: feb. (leap year), 1 to 28: feb. (non-leap year) example: 29 (d1, d2, d4, d8, d10, d20, 0, 0) = (1, 0, 0, 1, 0, 1, 0, 0) day of the week data (00 to 06): w1, w2, w4 a septenary up counter. day of the week is counted in the order of 00, 01, 02, ?, 06, and 00. set up day of the week and the count value. hour data (00 to 23 or 00 to 11): h1, h2, h4, h8, h10, h20, am / pm in a 12-hour expression, write 0; am, 1; pm in the pm/am bit. in a 24-hour expression, users can write either 0 or 1. 0 is read when the hour data is fr om 00 to 11, and 1 is read when from 12 to 23. example (12-hour expression): 12 p.m. (h1, h2, h4, h8, h10, h20, am/pm, 0) = (0, 1, 0, 0, 1, 0, 1, 0) example (24-hour expression): 22 (h1, h2, h4, h8, h10, h20, am/pm, 0) = (0, 1, 0, 0, 0, 1, 1, 0) minute data (00 to 59): m1, m2, m4, m8, m10, m20, m40 example: 32 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (0, 1, 0, 0, 1, 1, 0, 0) example: 55 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (1, 0, 1, 0, 1, 0, 1, 0) second data (00 to 59): s1, s2, s4, s8, s10, s20, s40 example: 19 seconds (s1, s2, s4, s8, s10, s20, s40, 0) = (1, 0, 0, 1, 1, 0, 0, 0)
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 15 2. status register 1 status register 1 is a 1-byte register that is used to display and set various modes. the bit configuration is shown below. b7 reset 12 / 24 r r r r/w r/w sc1 b6 b5 b4 b3 b2 b1 b0 bld int2 poc int1 sc0 r r/w w r : read w : write r/w : read/write figure 15 status register 1 b0 : poc this flag is used to confirm whether the power is on. the power-on detection circuit operates at power-on and b0 is set to ?1?. this flag is read-only. once it is read, it is automatically set to ?0?. when this flag is ?1?, be sure to initial ize. regarding the operation after power-on, refer to ? ? power-on detection circuit and register status? . b1 : bld this flag is set to ?1? when the power supply voltage decreases to the level of detection voltage (v det ) or less. users can detect a drop in the power supply voltage. this flag is set to ?1? once, is not set to ?0? again even if the power supply increases to the level of detection voltage (v det ) or more. this flag is read-only. when this flag is ?1?, be sure to initialize. regarding the operation of the power supply voltage detection circuit, refer to ? ? low power supply voltage detection circuit? . b2, b3 : int2, int1 this flag indicates the time set by alarm and when the time has reached it. this flag is set to ?1? when the time that users set by using the alarm interrupt function has come. t he int1 flag in ?1? at alarm 1 interrupt mode, the int2 flag in ?1? at alarm 2 interrupt mode. set ?0? in int1ae (b5 in the status register 2) or in int2ae (b1 in the status register 2) after reading ?1? in the int1 flag or in the int2 flag. this flag is read-only. this flag is read once, is set to ?0? automatically. b4, b5 : sc1, sc0 these are 2-bit sram type registers that can be freely set by users. b6 : 24 / 12 this flag is used to set 12-hour or 24-hour expression. 0 : 12-hour expression 1 : 24-hour expression b7 : reset the internal ic is initialized by setting this bit to ?1?. th is bit is write-only. it is always ?0? when read. when applying the power supply voltage to the ic, be sure to write ?1? to this bit to initialize the circuit. regarding each status of data after initialization, refer to ? ? register status after initialization ?.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 16 3. status register 2 status register 2 is a 1-byte register that is used to display and set various modes. the bit configuration is shown below. b7 int1fe int1me r/w r/w 32ke b6 b5 b4 b3 b2 b1 b0 sc3 sc2 int1ae r/w r/w: read/write r/w r/w r/w r/w r/w int2ae test figure 16 status register 2 b0 : test this is a test flag for sii. be sure to set this flag to ?0? in use. if this flag is set to ?1?, be sure to initialize to set ? 0?. b1 : int2ae this is an enable bit for alarm 2 interrupt. when this bit is ?0?, alarm 2 interrupt is disabled. when it is ?1?, it is enabled . to use alarm 2 interrupt, access the int register 2 and t he alarm expansion register 2 after enabling this flag. caution note that alarm 2 interrupt is output from the int pin regardless of the settings in flags b4 to b7. b2, b3 : sc3, sc2 these are 2-bit sram type registers that can be freely set by users. b4 : 32ke, b5 : int1ae, b6 : int1me, b7 : int1fe these bits are used to select the output mode for the int pin. table 10 shows how to select the mode. to use alarm 1 interrupt, access the int register 1 and the alarm expansion register 1, after setting the alarm 1 interrupt mode. table 10 output modes for int pin 32ke int1ae int1me int1fe int pin output mode 0 0 0 0 no interrupt 0 ? *1 0 1 output of user-set frequency 0 ? *1 1 0 per-minute edge interrupt 0 0 1 1 minute-periodical interrupt 1 (50% duty) 0 1 0 0 alarm 1 interrupt 0 1 1 1 minute-periodical interrupt 2 1 ? *1 ? *1 ? *1 32.768 khz output *1. don?t care (both of 0 and 1 are acceptable).
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 17 4. int register 1 and int register 2 the int register 1 is to set up the output of user-set frequenc y, or to set up alarm 1 interrupt. the int register 2 is for setting alarm 2 interrupt. users are able to switch the output mode by using the status register 2. if selecting to use the output mode for alarm interrupt by status register 2; this regi ster works as the alarm-time data register. in the int register 1, if selecting the output of user-set frequency by status regi ster 2; this register works as the data register to set the frequency for clock output. from the int pin, a clock pulse and alarm interrupt are output, according to the or-condition that these two registers have. (1) alarm interrupt users can set the alarm time (the data of day of the week, hour, minute) by using the int register 1 and 2 which are 3-byte data registers. the configuration of register is as we ll as the data register of day of the week, hour, minute, in the real-time data register; is expressed by the bcd code . do not set a nonexistent day. users are necessary to set up the alarm-time data according to the 12/24 hour expres sion that they set by using the status register 1. h8 h4 h2 h1 a1me m8 m4 m2 m1 h20 h10 m10 m20 m40 h8 h4 h2 h1 a2me m8 m4 m2 m1 h20 h10 m10 m20 m40 a m/ pm a 1we 0 0 w4 w2 w1 b7 b0 0 0 int register 1 0 0 w4 w2 w1 0 0 int register 2 a 2we a 1he a 2he a m/ pm b7 b0 b7 b0 b7 b0 b7 b0 b7 b0 figure 17 int register 1 and 2 (alarm-time data) the int register 1 has a1we, a1he, a1me at b0 in each byte. it is possible to make data valid; the data of day of the week, hour, minute which are in the corresponded byte; by setting these bits to ?1?. this is as well in a2we, a2he, a2me in the int register 2. regarding set-up of year, month, day, refer to ?9. alarm expansion register 1 and alarm expansion register 2? . setting example: alarm time ?7:00 pm? in the int register 1 (a) 12-hour expression (status register 1 b6 = 0) set up 7:00 pm data written to int register 1 day of week ? *1 ? *1 ? *1 ? *1 ? *1 ? *1 ? *1 0 hour 1 1 1 0 0 0 1 1 minute 0 0 0 0 0 0 0 1 b7 b0 *1. don?t care (both of 0 and 1 are acceptable). (b) 24-hour expression (status register 1 b6 = 1) set up 19:00 pm data written to int register 1 day of week ? *1 ? *1 ? *1 ? *1 ? *1 ? *1 ? *1 0 hour 1 0 0 1 1 0 1 *2 1 minute 0 0 0 0 0 0 0 1 b7 b0 *1. don?t care (both of 0 and 1 are acceptable). *2. set up pm/ am flag along with the time setting.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 18 (2) output of user-set frequency the int register 1 is a 1-byte data register to set up the ou tput frequency. setting each bit b7 to b3 in the register to ?1?, the frequency which corresponds to the bit is output in the and-form. sc4 to sc6 is 3-bit sram type registers that can be freely set by users. b7 r/w r/w 8 hz b6 b5 b4 b3 b2 b1 b0 sc4 16 hz 4 hz r/w r/w: read/write r/w r/w r/w r/w r/w sc5 sc6 2 hz 1 hz figure 18 int register 1 (data register for output frequency) example: b7 to b3 = 50h 16 hz 8 hz 4 hz 2 hz int pin output status register 2 set to int1fe = 1 1 hz figure 19 example of output from int regist er 1 (data register for output frequency)
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 19 5. clock-correction register the clock-correction register is a 1-byte register that is used to correct advance/delay of the clock. when not using this function, set this register to ?00h?. regarding the register values, refer to ? ? function to clock-correction? . b7 r/w r/w v3 b6 b5 b4 b3 b2 b1 b0 v5 v4 v2 r/w r/w: read/write r/w r/w r/w r/w r/w v6 v7 v1 v0 figure 20 clock-correction register 6. free register the free register is a 1-byte sram type register that can be set freely by users. b7 r/w r/w f3 b6 b5 b4 b3 b2 b1 b0 f5 f4 f2 r/w r/w: read/write r/w r/w r/w r/w r/w f6 f7 f1 f0 figure 21 free register
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 20 7. up counter the up counter is a 24-bit read-only register. it starts bi nary counting from ?000000h? from power-on and continues counting as long as power is being applied. it continues counting when initialization, instead of returning to ?000000h?. at power-on, registers are cleared by the power-on detection circui t so that the up counter is cleared to ?000000h?. if the power-on detection circuit does not operate successfully, the counter may start from the indefinite status. for successful operation of the power-on detection circuit, refer to ? ? power-on detection circuit and register status? . regarding the operation timing of the up counter, refer to ? ? up-count operation? . c128 c64 c32 c16 c8 c4 c2 c1 b7 b0 c3 2k c16k c8k c4k c2k c1k c512 c256 b7 b0 c8 m c4m c2m c1m c512k c256k c128k c64k b7 b0 figure 22 up counter table 11 example of count value and read data in register count value read data in register 000001h 000080h 000002h 000040h ? ? ? ? ? ? efffffh f7ffffh ? ? ? ? ? ? ffffffh ffffffh
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 21 8. fout setting register 1 and fout setting register 2 fout setting register 1 and 2 are 1-byte data registers to set up the output frequency for the fout pin. as well as the function output of user-set frequency, in the int register 1, by setting each bit in the register to ?1?, the frequency, which corresponds to the bit, is output in the and-form. figure 25 shows the setting example. at power-on, the fout setting register 1 and 2 are set to ?00h? so that no clock pulses are output. the value of output voltage is defined by v ddl . b7 r/w r/w 2 khz b6 b5 b4 b3 b2 b1 b0 8 khz 4 khz 1 khz r/w r/w: read/write r/w r/w r/w r/w r/w 16 khz 32 khz 512 hz 256 hz figure 23 fout setting register 1 b7 r/w r/w 8 hz b6 b5 b4 b3 b2 b1 b0 32 hz 16 hz 4 hz r/w r/w: read/write r/w r/w r/w r/w r/w 64 hz 128 hz 2 hz 1 hz figure 24 fout setting register 2 setting example: fout setting register 1 : b7 to b0 = 80h, fout setting register 2 : b7 to b0 = 05h 256 hz 128 hz 64 hz 32hz set data in fout setting register 1 and fout setting register 2 fout pin *1 *1 *1 *1. the value of output voltage is defined by v ddl . set v ddl v dd . figure 25 example of output of clock pulse
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 22 9. alarm expansion register 1 and alarm expansion register 2 the alarm expansion register 1 and 2 are 3-byte registers. they are expansion registers for the int register 1 and 2 which output alarm interrupt. users are able to set the alarm time; the data of year, month, day. the configuration of register is expressed by bcd code as well as the data register of year, month, day in the real-time register. m10 0 a1ye a 1me b7 b0 d1 d10 d20 0 a1de b7 b0 m4 m8 d8 d4 d2 y1 y2 y10 y20 y40 y80 b7 b0 y4 y8 a larm expansion register 1 a larm expansion register 2 m1 m2 m10 0 a2ye a2me b7 b0 d1 d10 d20 0 a2de b7 b0 m4 m8 d8 d4 d2 y1 y2 y10 y20 y40 y80 b7 b0 y4 y8 m1 m2 figure 26 alarm expansion register 1, alarm expansion register 2 to make the year data of alarm expansion register 1 valid, set a1ye to ?1?. for the month data, set a1me to ?1?, for the day data, set a1de to ?1?. set as well a2me, a2ye, a2de in the alarm expansion register 2. regarding how to set the data of day of the week, hour, and minute, refer to ?(1) alarm interrupt ? in ? 4. int register 1 and int register 2? . setting example: setting alarm time ?january 31, 2015? in the alarm expansion register 1 data written to the alarm expansion register 1 year 1 0 1 0 1 0 0 0 month 1 0 0 0 0 ? *1 1 1 day 1 0 0 0 1 1 ? *1 1 b7 b0 *1. don?t care (both of 0 and 1 are acceptable.)
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 23 ? power-on detection circ uit and register status the power-on detection circuit operates by power-on the s-35199a01, as a result each register is cleared; each register is set as follows. real-time data register : 00 (y), 01 (m), 01 (d), 0 (day of the week), 00 (h), 00 (m), 00 (s) status register 1 : ?01h? status register 2 : ?80h? int register 1 : ?80h? int register 2 : ?00h? clock correction register : ?00h? free register : ?00h? up counter : ?00 00 00h? fout setting register 1 : ?00h? fout setting register 2 : ?00h? alarm expansion register 1 : ?00h? alarm expansion register 2 : ?00h? ?1? is set in the poc flag (b0 in the status register 1) to indicate that power has been applied. to correct the oscillation frequency, the status register 2 goes in the mode the output of user-set frequency, so that 1 hz clock pulse is output from the int pin. when ?1? is set in the poc flag, be sure to initialize. the poc flag is set to ?0? due to initialization so that the output of user-set frequency mode is cleared. (refer to ? ? register status after initialization ?.) for the regular operation of power-on detection circuit, the peri od to power-up the s-35199a01 is that the voltage reaches 1.3 v within 10 ms after setting the ic?s power supply voltage at 0 v. when the power-on detection circuit is not working normally is; the poc flag (b0 in the status register) is not in ?1?, or 1 hz is not output from the int pin. in this case, power-on the s-35199a01 once again because the internal data may be in the indefinite status. do not transmit data immediately after power-on at least one sec because the power-on detection circuit is operating. within 10 ms 1.3 v 0 v *1 *1. 0 v indicates that there are no potential differences between the vdd pin and vss pin of the s-35199a01. figure 27 how to raise the power supply voltage
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 24 ? register status after initialization the status of each register after initialization is as follows. real-time data register : 00 (y), 01 (m), 01 (d), 0 (day of the week), 00 (h), 00 (m), 00 (s) status register 1 : ?0 b6 b5 b4 0 0 0 0 b? (in b6, b5, b4, the data of b6, b5, b6 in the status register 1 at initialization is set. refer to figure 28 .) status register 2 : ?00h? int register 1 : ?00h? int register 2 : ?00h? clock correction register : ?00h? free register : ?00h? up counter : is not initialized and continues counting. fout setting register 1 : ?00h? fout setting register 2 : ?00h? alarm expansion register 1 : ?00h? alarm expansion register 2 : ?00h? cs sck 0 0 0 0 1 0 1 0 0 0 1 1 0 x sio code + command 0 0 0 000110 01 code + command 0 0 0 0 1 0 0 0 write to status register 1 read from status register 1 b5 : not reset b5 b7 write ?1? to reset flag and sc0. figure 28 data of status register 1 at initialization
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 25 ? low power supply voltage detection circuit the s-35199a01 has a low power supply voltage detection circui t, so that users can monitor drops in the power supply voltage by reading the bld flag (b1 in the status register 1) . there is a hysteresis width of approx. 0.15 v (typ.) between detection voltage and release voltage (refer to ? ? characteristics (typical data)? ). the low power supply voltage detection circuit does the sampling operation only once in one sec for 15.6 ms. if the power supply voltage decreases to the level of detection voltage (v det ) or less, ?1? is set to the bld flag so that sampling operation stops. once ?1? is detected in the bld flag, no sampling operation is performed even if the power supply voltage increases to the level of release voltage or more, and ?1? is held in the bld flag. after initialization, or onc e the bld flag is read, the bld flag is automatically set to ?0? to restart the sampling operation. if the bld flag is ?1? even after the power supply voltage is recovered, the internal circuit may be in the indefinite status. in this case, be sure to initialize the circuit. v dd bld flag stop stop stop sampling pulse hysteresis width 0.15 v approximately bld flag reading detection voltage release voltage 15.6 ms 1 s 1 s figure 29 timing of low power supply voltage detection circuit ? circuits power-on and low po wer supply voltage detection figure 30 shows the changes of the poc flag and bld flag due to v dd fluctuation. v dd bld flag status register 1 reading poc flag low power supply voltage detection voltage low power supply voltage detection voltage v ss figure 30 poc flag and bld flag
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 26 ? correction of nonexistent data and end-of-month when users write the real-time data, the s-35199a01 checks it. in case that the data is invalid, the s-35199a01 does the following procedures. 1. processing of nonexistent data table 12 processing of nonexistent data register normal data nonexistent data result year data 00 to 99 xa to xf, ax to fx 00 month data 01 to 12 00, 13 to 19, xa to xf 01 day data 01 to 31 00, 32 to 39, xa to xf 01 day of week data 0 to 6 7 0 24-hour 0 to 23 24 to 29, 3x, xa to xf 00 hour data *1 12-hour 0 to 11 12 to 20, xa to xf 00 minute data 00 to 59 60 to 79, xa to xf 00 second data *2 00 to 59 60 to 79, xa to xf 00 *1. in a 12-hour expression, write the pm/am flag (b1 in hour data in the real-time data register). in 24-hour expression, the pm/am flag in the real-time data register is omitted. however in the flag in read, users are able to read 0; 0 to 11, 1; 12 to 23. *2. processing of nonexistent data, regarding second data, is done by a carry pulse which is generated one sec after, after write. at this point the carry pulse is sent to the minute-counter. 2. correction of end-of-month a nonexistent day, such as february 30 and april 31, is set to the first day of the next month.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 27 ? int pin output mode these are selectable for the int pin output mode; alarm 1 interrupt, alarm 2 interrupt, the output of user-set frequency, per-minute edge interrupt output, minute-periodical interrupt output 1 and 2, 32.768 khz output. in alarm 1 interrupt/output of frequency; set data in the int r egister 1. in alarm 2 interrupt, set data in the int register 2. to swith the output mode, use the status register 2. refer to ? 3. status register 2 ? in ? ? configuration of register ?. when switching the output mode, be careful of the output status of the pin. especially, when using alarm interrupt/output of frequency, switch the output mode after setting ?00h? in the int register 1 or 2. alarm 2 inte rrupt is dependent from other modes. regardless of other settings of mode if alarm 2 interrupt was generated, be careful that ?l? is output from the int pin. in 32.768 khz output/per-minute edge interrupt output/minute-periodical interrupt output, it is unnecessary to set data in the int register 1 or 2 for users. refer to the followings regarding each operation of output modes. 1. alarm interrupt output alarm interrupt output is the function to output ?l? from the int pin, at the alarm time which is set by user has come. if setting the pin output to ?h?, turn off the alarm function by setting ?0? in int1ae/int2ae in the status register 2. to set the alarm time, set the data of day of the week, hour, minute in the int register 1 or 2, set the data of year, month, day in the alarm expansion register 1 or 2. refer to ?4. int register 1 and int register 2? and ?9. alarm expansion register 1 and alarm expansion register 2? in ? ? configuration of register? . alarm setting of ?y (year), m (month), d (day), w (day of the week), h (hour), m (minute)? int register x alarm enable flag ? axhe = axme = axwe = "1" alarm expansion register x alarm enable flag ? axye = axme = axde = "1" change by program alarm time matches period when alarm time matches off change by program 01 s 59 s *1 h h 00m 00 s h h (m ? 1) m 59 s real-time data int1ae/int2ae h h (m + 1) m 00 s change by program int pin status register 2 setting ? alarm 1 interrupt 32ke = 0, int1me = int1fe = 0 ? alarm 2 interrupt none mx comparator hx wx dx alarm interrupt mx yx second real-time data minute int register 1 int register 2 y (year), m (month), d (day), w (day of the week) alarm expansion register 1 alarm expansion register 2 year hour week day month *1. if users clear int1ae/int2ae once; ?l? is not output from the int pin by setting int1ae/int2ae enable again, within a period when the alarm time matches real-time data. figure 31 alarm interrupt output timing (1/2)
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 28 alarm setting of ?h (hour)? mx hx wx dx mx yx off off *1 int1ae/int2ae *1 comparator alarm interrupt second real-time data minute int register 1 int register 2 alarm expansion register 1 alarm expansion register 2 year hour week day month change by program alarm time matches period when alarm time matches change by program real-time data change by program int pin y (year), m (month), d (day), w (day of the week) alarm time matches *2 01 s 59 s h h 00 m 00 s h h 59 m 59 s h h 01 m 00 s (h + 1) h 00 m 00 s (h ? 1) h 59 m 59 s int register x alarm enable flag ? axhe = axme = axwe = "1" alarm expansion register x alarm enable flag ? axye = axme = axde = "1" status register 2 setting ? alarm 1 interrupt 32ke = 0, int1me = int1fe = 0 ? alarm 2 interrupt none change by program *1. if users clear int1ae/int2ae once; ?l? is not output from the int pin by setting int1ae/int2ae enable again, within a period when the alarm time matches real-time data. *2. if turning the alarm output on by changing the program, within the period when the alarm time matches real-time data, ?l? is output again from the int pin when the minute is counted up. figure 32 output timing of alarm interrupt (2/2) 2. output of user-set frequency the output of user-set frequency is the function to output the frequency which is selected by using data, from the int pin, in the and-form. set up the data of frequency in the int register 1. refer to ?4. int register 1 and int register 2? in ? ? configuration of register? . int1fe int pin off change by program status register 2 setting 32ke = 0, int1ae = don?t care (0 or 1), int1me = 0 free-run output starts figure 33 output timing of user-set frequency
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 29 3. per-minute edge interrupt output per-minute edge interrupt output is the function to output ?l? from the int pin, when the first minute-carry processing is done, after selecting the output mode. to set the pin output to ?h?, set ?0? in int1me in the status register 2 to turn off the output mode of per-minute edge interrupt. int1me int pin off "l" is output again if this period is within 7.9 ms *1 . change by program status register 2 setting ? 32ke = 0, int1ae = don?t care (0 or 1), int1fe = 0 minute-carry processing minute-carry processing *1. pin output is set to ?h? by disabling the output mode within 7.9 ms, because the signal of this procedure is maintained for 7.9 ms. note that pin output is set to ?l? by setting enable the output mode again. figure 34 timing of per-minute edge interrupt output 4. minute-periodical interrupt output 1 the minute-periodical interrupt 1 is the function to output the one-minute clock pulse (duty 50%) from the int pin, when the first minute-carry processing is done, after selecting the output mode. int1fe, int1me int pin "l" is output again if this period is within 7.9 ms *1 . change by program (off) status register 2 setting ? 32ke = 0, int1ae = 0 minute-carry processing "h" is output again if this period is within 7.9 ms. "l" is output in the next minute-carry processing 30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s minute-carry processing minute-carry processing minute-carry processing minute-carry processing *1. setting the output mode disable makes the pin output ?h?, while the output from the int pin is in ?l?. note that pin output is set to ?l? by setting enable the output mode again. figure 35 timing of minute-periodical interrupt output 1
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 30 5. minute-periodical interrupt output 2 the output of minute-periodical interrupt 2 is the function to output ?l?, for 7.9 ms, from the int pin, synchronizing with the first minute-carry processing after selecting the output mode. however, in read in the real-time data register, the procedure delays at max. 0.5 sec thus output ?l? from the int pin also delays at max. 0.5 sec. in write in the real-time data register, some delay is made in the output period due to write timing and the second-data during write. (a) during normal operation 7.9 ms 7.9 ms 7.9 ms 60 s 60 s int pin minute-carry processing minute-carry processing minute-carry processing (b) during read in the real-time data int pin 7.9 ms serial communication 7.9 ms 7.9 ms 0.5 s max. 60 s 60 s real-time data read command real-time data reading real-time data read command real-time data reading minute-carry processing minute-carry processing minute-carry processing (normal minute- carry processing) (c) during write in the real-time data int pin 7.9 ms real-time data write timing 7.9 ms 7.9 ms 55 s 80 s minute-carry processing minute-carry processing minute-carry processing 45 s 10 s 30 s 50 s the output period is shorter. the output period is longer. second data of writing: "50" s second data of writing: "10" s figure 36 timing of minute-periodical interrupt output 2
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 31 6. operation of power-on detection circuit when power is applied to the s-35199a01, the power-on detection operates to set ?1? in the poc flag (b0 in the status register 1). a 1 hz clock pulse is output from the int pin. status register 2 setting int1fe int pin off 0.5 s 0.5 s change by reset command ? int1ae = int1me = 0, 32ke = 0 figure 37 output timing of int pin during operation of power-on detection circuit ? function to clock-correction the function to clock-correction is to correct advance/delay of the clock due to the deviation of oscillation frequency, in order to make a high precise clock. for correction, the s-35199a01 adjusts the clock pulse by using a certain part of the dividing circuit, not adjusting the frequenc y of the crystal oscillator. correction is performed once every 20 seconds (or 60 seconds). the minimum resolution is approx. 3 ppm (or approx. 1 ppm) and the s-35199a01 corrects in the range of ? 195.3 to +192.2 ppm (or of ? 65.1 to +64.1 ppm). (refer to table 13 .) users can set up this function by using the clock-correction register. regarding how to calculate the setting data, refer to ?1. how to calculate? . when not using this function, be sure to set ?00h?. table 13 function to clock-correction b0 = 0 b0 = 1 correction every 20 seconds every 60 seconds minimum resolution 3.052 ppm 1.017 ppm correction range ? 195.3 to +192.2 ppm ? 65.1 to +64.1 ppm
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 32 1. how to calculate (1) if current oscillation frequency > target frequency (in case the clock is fast) correction value *1 = 128 ? integral value (current oscillation frequency actual measurement value *2 ) (minimum resolution *4 ) (current oscillation frequency actual measurement value *2 ) (target oscillation frequency *3 ) ? caution the figure range which can be corrected is that the calculated value is from 0 to 64. *1. convert this value to be set in the clock correction register. for how to convert, refer to ? (a) calculation example 1?. *2. measurement value when 1 hz clock pulse is output from the int pin. *3. target value of average frequency when the clock correction function is used. *4. refer to table 13 . (a) calculation example 1 in case of current oscillation frequency actual measurement value = 1. 000070 hz, target oscillation frequency = 1.000000 hz, b0 = 0 (minimum resolution = 3.052 ppm) correction value = 128 ? integral value ? ? ? ? () 1.000070 ? () 1.000000 () 1.000070 () 3.052 10 ? 6 = 128 ? integral value (22.93) = 128 ? 22 = 106 convert the correction value ?106? to 7-bit binary and obtain ?1101010b?. reverse the correction value ?1101010b? and set it to b7 to b1 of the clock correction register. thus, set the clock correction register: (b7, b6, b5, b4, b3, b2, b1, b0) = (0, 1, 0, 1, 0, 1, 1, 0) (2) if current oscillation frequency < target frequency (in case the clock is slow) correction value = integral value (current oscillation frequency actual measurement value) (minimum resolution) (current oscillation frequency actual measurement value) (target oscillation frequency) ? + 1 caution the figure range which can be corrected is that the calculated value is from 0 to 62. (a) calculation example 2 in case of current oscillation frequency actual measurem ent value = 0.999920 [hz], target oscillation frequency = 1.000000 [hz]. b0 = 0 (minimum resolution = 3.052 ppm) correction value = integral value ? ? ? ? () 1.000000 ? () 0.999920 () 0.999920 () 3.052 10 -6 + 1 = integral value (26.21) + 1 = 26 + 1 = 27 thus, set the clock correction register: (b7, b6, b5, b4, b3, b2, b1, b0) = (1, 1, 0, 1, 1, 0, 0, 0) (b) calculation example 3 in case of current oscillation frequency actual measurem ent value = 0.999920 [hz], target oscillation frequency = 1.000000 [hz], b0 = 1 (minimum resolution = 1.017 ppm) correction value = integral value ? ? ? ? () 1.000000 ? () 0.999920 () 0.999920 () 1.017 10 -6 + 1 = integral value (78.66) + 1 this calculated value exceeds the correctable range 0 to 62. b0 = ?1? (minim um resolution = 1.017 ppm) indicates the correction is impossible.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 33 2. setting value for register and correction value table 14 setting value for register and correction value (minimum resolution: 3.052 ppm (b0 = 0)) b7 b6 b5 b4 b3 b2 b1 b0 correction value [ppm] rate [s/day] 1 1 1 1 1 1 0 0 192.3 16.61 0 1 1 1 1 1 0 0 189.2 16.35 1 0 1 1 1 1 0 0 186.2 16.09 ? ? ? ? ? ? ? ? ? 0 1 0 0 0 0 0 0 6.1 0.53 1 0 0 0 0 0 0 0 3.1 0.26 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 ? 3.1 ? 0.26 0 1 1 1 1 1 1 0 ? 6.1 ? 0.53 1 0 1 1 1 1 1 0 ? 9.2 ? 0.79 ? ? ? ? ? ? ? ? ? 0 1 0 0 0 0 1 0 ? 189.2 ? 16.35 1 0 0 0 0 0 1 0 ? 192.3 ? 16.61 0 0 0 0 0 0 1 0 ? 195.3 ? 16.88 table 15 setting value for register and correction value (minimum resolution: 1.017 ppm (b0 = 1)) b7 b6 b5 b4 b3 b2 b1 b0 correction value [ppm] rate [s/day] 1 1 1 1 1 1 0 1 64.1 5.54 0 1 1 1 1 1 0 1 63.1 5.45 1 0 1 1 1 1 0 1 62.0 5.36 ? ? ? ? ? ? ? ? ? 0 1 0 0 0 0 0 1 2.0 0.18 1 0 0 0 0 0 0 1 1.0 0.09 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 1 1 ? 1.0 ? 0.09 0 1 1 1 1 1 1 1 ? 2.0 ? 0.18 1 0 1 1 1 1 1 1 ? 3.0 ? 0.26 ? ? ? ? ? ? ? ? ? 0 1 0 0 0 0 1 1 ? 63.1 ? 5.45 1 0 0 0 0 0 1 1 ? 64.1 ? 5.54 0 0 0 0 0 0 1 1 ? 65.1 ? 5.62
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 34 3. how to confirm setting value for register and result of correction the s-35199a01 does not adjust the frequency of the crystal oscillation by using the clock-correction function. therefore users cannot confirm if it is corrected or not by measuri ng output 32.768 khz. when the function to clock-correction is being used, the cycle of 1 hz clock pulse output from the int pin changes once in 20 times or 60 times, as shown in figure 38 . int pin (1 hz output) a a a a b b0 = 0, a : 19 times, b : once b0 = 1, a : 59 times, b : once 19 times or 59 times once figure 38 confirmation of correction result measure a and b by using the frequency counter *1 . calculate the average frequency (tave) based on the measurement results. b0 = 0, tave = (a 19 + b) 20 b0 = 1, tave = (a 59 + b) 60 calculate the error of the clock based on the average frequency (tave). the following shows an example for confirmation. confirmation example: when b0 =0, 66h is set measurement results: a = 1.000080 hz, b = 0.998493 hz clock correction register setting value average frequency [hz] per day [s] before correction 00 h (tave = a) 1.000080 86393 after correction 66 h (tave = (a 19 + b) 20) 1.00000065 86399.9 calculating the average frequency allows to confirm the result of correction. *1. use a high-accuracy frequency counter of 7 digits or more. caution 1. clock pulse output from the fout pin is not corrected. 2. measure the oscillation frequency under the usage conditions.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 35 ? 32.768 khz output pin the s-35199a01 outputs a 32.768 khz clock pulse from the int , f32k, and fout pins. however, do not output 32.768 khz from these three pins simultaneously because stability of the crystal oscillator is affected. when using the function to clock-correction or adjusting the oscillation frequency, measure the oscillation frequency under the usage conditions. for example, when using 32.768 khz clock pulse which is output from the fout pin, measure this ic while the pulse is being output from the pin. ? timing of clock output from f32k pin the 32.768 khz clock pulse of the oscillation frequency is output from the f32k pin. the f32k pin has an nch open-drain output. when the ctrl pin is in ?h?, the clock pulse is output, and when the ctrl pin is in ?l? or open, the f32k pin is in high impedance. to output 32.768 khz from the f32k pin, set the ctrl pin to ?h? when one sec or more has elapsed after power-on. ctrl pin f32k pin on off figure 39 timing of clock output from f32k pin ? up-count operation the up counter is a 24-bit read-only binary counter. this counter starts counting from ?000000h? from power-on and returns to ?000000h? at the next clock after it has reached ?ffffffh?. a clock pulse is a pulse that is output when the second-data in the real-time data is ?00h?. therefore, some delay is made in the period that a clock pulse is being output due to write timing and write data. the registers are not initialized unless power-on again, so that users are able to grasp the elapsed time from power-on up to 30 years. figure 40 shows the example of timing chart of up counter?s operation. power supply clock pulse of real-time second data "00h" on off 000001h 000010h ffffffh 000000h 000001h 000000h 20 s 60 s 40 s off 40 s 24-bit binary up counter 60 s 60 s 10 s write real-time second data: 50 seconds write real-time second data: 20 seconds a clock pulse is 60 seconds or less. a clock pulse is 60 seconds or more. figure 40 timing chart of 24-bit binary up counter
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 36 ? serial interface the s-35199a01 receives various commands via a 3-wire serial interface to read/write data. regarding transmission is as follows. 1. data read when data is input from the sio pin in synchronization with the falling of the sck clock after setting the cs pin to ?h?, the data is loaded internally in synchronization with the next rising of the sck clock. when w/r bit = ?1? is loaded at the eighth rising of the sck clock, the state of data reading is entered. data corresponding to each command is then output in synchronization with the falling of the subsequent sck clock input. when the sck clock is less than 8, the ic is in the clock-wait status, and no processing is performed. 2. data write when data is input from the sio pin in synchronization with the falling of the sck clock after setting the cs pin to ?h?, the data is loaded internally in synchronization with the next rising of the sck clock. when w/r bit = ?0? is loaded at the eighth rising of the sck clock, the state of data writing is entered. in this state, the data, which is input in synchronization with the falling of the subsequent sck clock input, is written to registers accord ing to each command. as well as in read, when the sck clock is less than 8, the ic is in the clock-wait status, and no processing is performed. 3. data access (1) real-time data access 1 64 8 1 0 1 0 0 1 1 0 x during reading: output mode switching cs sck sio year data second data b0 b7 during reading: in p ut mode switchin g code + command r / w b0 b7 16 56 figure 41 real-time data access 1
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 37 (2) real-time data access 2 32 8 1 1 1 0 0 1 1 0 x during reading: output mode switching cs sck sio hour data second data b0 b7 during reading: input mode switching r / w minute data b0 b7 b0 b7 code + command 16 24 figure 42 real-time data access 2 (3) status register 1 access and status register 2 access 8 1 cs sck *1 0001 1 0 x during reading: output mode switching sio status data during reading: input mode switching b0 b7 r / w 16 code + command *1. 0 : status register 1 selected 1 : status register 2 selected figure 43 status register 1 access and status register 2 access
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 38 (4) int register 1 access and int register 2 access in read/write the int register 1, data varies depending on the setting of the status register 2. be sure to read/write the int register 1 after setting the status register 2. w hen setting the alarm by using the status register 2, these registers work as 3-byte alarm time data registers, in other statuses, they work as 1-byte registers. when outputting the user-set frequency, they are the data registers to set up the frequency. caution users cannot use both functions of alarm 1 interrupt for int pin and the output of user-set frequency simultaneously. read/write the int register 2 after setting int2ae in the stat us register 2. when int2ae is in ?1?, the int register 2 works as for setting the 3-byte alarm time data. the int r egister 2 does not have the function to output the user-set frequency. regarding details of each data, refer to ?4. int register 1 and int register 2? in ? ? configuration of register? . 32 8 1 0 1 0 1 1 0 x during reading: output mode switching cs sck sio day of week data minute data b0 b7 during reading: input mode switching *1 r / w 16 24 hour data b0 b7 b0 b7 code + command *1. 0 : int register 1 selected 1 : int register 2 selected figure 44 int register 1 access and int register 2 access 8 1 cs sck 00101 1 0 x during reading: output mode switching sio frequency setting data during reading: input mode switching b0 b7 r / w 16 code + command figure 45 int register 1 (data register for output frequency) access
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 39 (5) clock correction register access 8 1 cs sck 0 1 1 0 1 1 0 x during reading: output mode switching sio clock correction data during reading: input mode switching b0 b7 r / w 16 code + command figure 46 clock correction register access (6) free register access 8 1 cs sck 11101 1 0 x during reading: output mode switching sio free register data during reading: input mode switching b0 b7 r / w 16 code + command figure 47 free register access
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 40 (7) up counter access access to the up counter is read-only. users cannot write in this counter with write operation. 32 8 1 1 0 0 0 1 1 1 0 x output mode switching cs sck sio count data count data b0 b7 input mode switching c1 c2 c4 c8 c16 c32 c64 c128 c32k c16k c128k c256k c512k c1m c2m c4m c8m c64k b0 b7 read only code + command 16 24 figure 48 up counter access (8) fout setting register 1 access and fout setting register 2 access 8 1 cs sck a 011 1 0 x sio fout setting data b0 b7 r / w *1 16 code + command b *1 to select register, use the following settings. a b register to select 0 1 fout setting register 1 1 0 fout setting register 2 figure 49 fout setting register 1 access and fout setting register 2 access
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 41 (9) alarm expansion register 1 access and alarm expansion register 2 access write in the alarm expansion register 1 (alarm expans ion register 2) after setting the status register 2. 32 8 1 0 1 1 1 1 0 x during reading: output mode switching cs sck sio year data day data b0 b7 during reading: input mode switching r / w *1 16 24 month data b0 b7 b0 b7 code + command *1. 0 : alarm expansion register 1 access 1 : alarm expansion register 2 access figure 50 alarm expansion register 1 access and alarm expansion register 2 access
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 42 ? flowchart of initialization at power- on and example of real-time data set-up figure 51 shows the flowchart of initialization at power-on and an example of real-time data set-up. regarding how to apply power, refer to ? ? power-on detection circuit and register status? . it is unnecessary for users to comply with this flowchart of real-time data strictly. and if using the default data at initializing, it is also unnecessary to set up again. no yes start poc = 1 power-on initialize (status register 1 b7 = 1) set 24-hour/12-hour dis p la y to status re g ister 1 confirm data in status register 1 ok ng set real-time data 1 read real-time data 1 initialization at power-on example of real-time data set-up wait for 1 s read status register 1 poc = 0 no yes bld = 0 yes no test = 0 yes no end read status register 1 read status register 1 read status register 2 figure 51 example of initialization flowchart
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 43 ? examples of application circuits v cc xout xin s-35199a01 sio vss vdd sck vss vcc cpu int cs system power supply c g ctrl fout f32k vddl 10 k 10 k 10 k caution 1. because the i/o pin has no protective diode on the vdd side, the relation of v cc v dd is possible. but pay careful attention to the specifications. 2. start communication under stable condition after power-on the power supply in the system. figure 52 application circuit 1 vss vcc cpu xout xin s-35199a01 sio vss vdd sck int cs system power supply c g vddl fout f32k ctr l 10 k 10 k caution start communication under stable condition after power-on the power supply in the system. figure 53 application circuit 2 caution the above connection diagrams do not guarantee operation. set the constants after performing sufficient evaluation using the actual application.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 44 ? adjustment of oscillation frequency 1. configuration of oscillation since crystal oscillation is sensitive to external noise (the clock accuracy is affected), the following measures are essential for optimizing the oscillation conf iguration. (1) place the s-35199a01, crystal oscillator, and external capacitor (c g ) as close to each other as possible. (2) increase the insulation resistance between pins and the substrate wiring patterns of xin and xout. (3) do not place any signal or power lines close to the oscillator. (4) locating the gnd layer immediately below the oscillator is recommended. (5) locate the bypass capacitor adjacent to the power supply pin of the s-35199a01. s-35199a01 xout xin r f = 100 m r d = 100 k c d = 8 pf c g parasitic capacitance c po c d r d r f crystal oscillator: 32.768 khz parasitic capacitance c pi c l = 6 pf *1 c g = 0 to 9.1 pf c pi , c po < 5 pf oscillation internal constant standard values: *1. when using the crystal oscillator with a c l value of 7 pf, externally connect c d if necessary. figure 54 connection diagram 1 c g s-35199a01 top view crystal oscillator a3 b3 vdd d3 a2 b2 c2 d2 vss xin xout d1 locate the gnd layer in the layer immediately below make all the wiring reverse from the crystal oscillator surface wiring rear surface wiring figure 55 connection diagram 2 caution 1. when using the crystal oscillator with a c l exceeding the rated value (7 pf) (e.g : c l = 12.5 pf), oscillation operation may become unstable. use a crystal oscillator with a c l value of 6 pf or 7 pf. 2. oscillation characteristics is subject to the variation of each co mponent such as s ubstrate parasitic capacitance, parasitic resistance, crystal oscillator, and c g . when configurating oscillator, pay sufficient attention for them.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 45 2. measurement of oscillation frequency when the s-35199a01 is turned on, the internal power-on detect ion circuit operates and a signal of 1 hz is output from the int pin to select the crystal oscillator and optimize the c g value. turn the power on and measure the signal with a frequency counter following the circuit configuration shown in figure 56 . if 1 hz signal is not output, the power-on detection circuit does not operate normally. turn off the power and then turn it on again. for how to apply power, refer to ? ? power-on detection circuit and register status? . remark if the error range is 1 ppm in relation to 1 hz, the time is shifted by approximately 2.6 seconds per month (calculated using the following expression). 10 ?6 (1 ppm) 60 seconds 60 minutes 24 hours 30 days = 2.592 seconds int sio cs sck ctrl fout f32k s-35199a01 vdd vddl xout xin vss c g frequency counter open open open open 10 k 10 k 10 k figure 56 configuration of oscillation frequency measurement circuit caution 1. use a high-accuracy freque ncy counter of 7 digits or more. 2. measure the oscillation freq uency under the usage condition. 3. since the 1 hz signal continues to be output, initialization must be executed during normal operation.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 46 3. adjustment of oscillation frequency (1) adjustment by setting c g matching of the crystal oscillator with the nominal frequency must be performed with the stray capacitance on the board included. select a crystal oscillator and optimize the c g value in accordance with the flowchart below. start end set to center of variable capacitance *3 select a crystal oscillator *1 variable capacitance change c g optimal value *2 frequency c g in specification set c g make fine adjustment of frequency using variable capacitance yes no yes no no yes trimmer capacitor fixed capacitor no yes *1 . request a crystal manufacturer for matching evaluation between the ic and a crystal. the recommended crystal characteristic values are, c l value (load capacitance) = 6 pf, r 1 value (equivalent serial resistance) = 50 k max. *2 . the c g value must be selected on the actual pcb since it is affected by stray capacitance. select the external c g value in a range of 0 pf to 9.1 pf. *3 . adjust the rotation angle of the variable capacitance so that the capacitance value is slightly smaller than the center, and confirm the oscillation frequency and the center value of the variable capacitance. this is done in order to make the capacitance of the center value smalle r than one half of the actual capacitance value because a smaller capacitance value increases the frequency variation. figure 57 crystal oscillator setting flow caution 1. the oscillation frequency varies depending on the ambient temperature and power supply voltage. refer to the characteristics examples. 2. the 32.768 khz crystal oscilla tor operates more slowly at an operating temperature than higher or lower 20 to 25 c. therefore, it is recommended to set the oscillator to operate slightly faster at normal temperature.
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 47 ? product name structure 1. product name s-35199a01 - hrt1 package name (abbreviation) and ic packing specification hrt1 : wlp-12a, tape product name 2. package drawing code package name package tape reel wlp-12a ha012-a-p-sd ha012-a-c-sd ha012-a-r-sd ? precautions ? although the ic contains a static electric ity protection circuit, static electricity or voltage that exce eds the limit of the protection circuit should not be applied. ? seiko instruments inc. assumes no responsibility for the way in which this ic is used in products created using this ic or for the specifications of that product, nor does seiko instruments inc. assume any responsibility for any infringement of patents or copyrights by products that include th is ic either in japan or in other countries. ? cautions on using wlp package ? the silicon surface of the device is exposed on the marking side of the package. this por tion is less strong against the mechanical stress compared with normal plastic packages, handle packages with extreme care to avoid any cracking and defects. the pcb potential of the device is exposed on the s ilicon surface, so be careful not to touch the external potential. ? translucent resin is coated over the device side of this package. note that using the package with the device exposed to a strong light source may affect the device characteristics.
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 48 ? characteristics (typical data) (1) current consumption 1 (current consumption out of communication) vs. v dd characteristics (2) current consumption 2 (current consumption when 32.768 khz is output) vs. v dd characteristics ta = 2 5 c, c l = 6 pf, c g = 5.1 pf 1.0 0.8 0.6 0.4 0.2 0 06 1 2 3 5 4 v dd [v] i dd1 [a] ta = 2 5 c, c l = 6 pf, c g = 5.1 pf 1.0 0.8 0.6 0.4 0.2 0 06 1 2 3 5 4 v dd [v] i dd2 [a] (3) current consumption 3 (current consumption during communication) vs. input clock characteristics (4) current consumption 1 (current consumption out of communication) vs. temperature characteristics ta = 2 5 c, c l = 6 pf, c g = 5.1 pf 0 0 1000 200 400 600 800 80 100 60 40 20 sck [khz] i dd3 [a] v dd = 5.0 v v dd = 3.0 v c l = 6 pf, c g = 5.1 pf 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 ?40 85 0 ?25 25 50 75 ta [ c] i dd1 [a] v dd = 5.0 v v dd = 3.0 v (5) current consumption 1 (current consumption out of communication) vs. c g characteristics (6) oscillation frequency vs. c g characteristics ta = 2 5 c, c l = 6 pf 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2 01 0 864 c g [pf] i dd1 [a] v dd = 5.0 v v dd = 3.0 v ta = 2 5 c, c l = 6 pf, c g = 5.1 pf (reference) 60 40 20 0 ?20 ?40 ?60 2 01 0 864 c g [pf] f/f [ppm] v dd = 5.0 v v dd = 3.0 v
3-wire real-time clock rev.2.0 _00 s-35199a01 seiko instruments inc. 49 (7) oscillation frequency vs. v dd characteristics (8) oscillation frequency vs. temperature characteristics ta = 2 5 c, c l = 6 pf, c g = 5.1 pf (reference) 50 40 30 20 10 0 ?10 ?20 ?30 ?40 ?50 06 1 2 3 5 4 v dd [v] f/f [ppm] c l = 6 pf, c g = 5.1 pf (reference) 20 ?140 ?40 85 0 ?25 25 50 75 ?20 0 ?60 ?40 ?100 ?80 ?120 ta [ c] f/f [ppm] v dd = 5.0 v v dd = 3.0 v (9) oscillation start time vs. temperature characteristics (xout pin monitored) (10) output current characteristics 1(v out vs. i ol1 ) ta = 2 5 c, c l = 6 pf 500 450 400 350 300 250 200 150 100 50 0 2 010 864 c g [pf] t sta [ms] v dd = 5.0 v v dd = 3.0 v int pin, f32k pin, ta = 25 c 40 0 06 24 20 25 30 15 10 5 v out [v] i ol1 [ma] v dd = 5.0 v v dd = 3.0 v 135 35 (11) output current characteristics 2 (v out vs. i ol2 ) (12) output current characteristics 3(v dd vs. i oh ) sio pin ? fout pin, ta = 25 c 70 0 06 24 40 50 60 30 20 10 v out [v] i ol2 [ma] v dd = 5.0 v v dd = 3.0 v 135 fout pin, ta = 25 c 0 ?3.5 0 0.6 0.2 0.4 ?1.5 ?1.0 ?0.5 ?2.0 ?2.5 ?3.0 v dd ?v out [v] i oh [ma] v dd = 5.0 v v dd = 3.0 v 0.1 0.3 0.5
3-wire real-time clock s-35199a01 rev.2.0 _00 seiko instruments inc. 50 (13) input current characteristics 3 (v in vs. i ih ) (14) low power supply voltage detection voltage and release voltage, time keeping power supply voltage (min) vs. temperature characteristics cs pin, ctrl pin, ta = 25 c 700 0 06 24 400 500 600 300 200 100 v in [v] i ih [a] v dd = 5.0 v v dd = 3.0 v 135 c l =6 pf, c g = 5.1 pf 1.4 0 ?40 85 0 ?25 25 50 75 1.2 0.8 1.0 0.4 0.6 0.2 ta [ c] v dd [v] detection voltage release voltage v ddt (min) (15) characteristics of power-on detection circuit ta = ? 40 to +85 c v dd [v] 5.5 1.3 0 t 1 t 2 t 3 t 1 : a condition that power-on detection works at turning on t 1 10 ms t 2 : a condition that the ic works regularly and data is retained during power voltage drop t 2 1 ms t 3 : a condition that the ic works regularly and data is retained during power voltage rise t 3 1 ms

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www.sii-ic.com ? the information described herein is subject to change without notice. ? seiko instruments inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design. ? when the products described herein are regulated produ cts subject to the wassenaar arrangement or other agreements, they may not be exported without authoriz ation from the appropriate governmental authority. ? use of the information described he rein for other purposes and/or repr oduction or copying without the express permission of seiko instrum ents inc. is strictly prohibited. ? the products described herein cannot be used as par t of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. ? although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may oc cur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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