for further information contact your local stmicroelectronics sales office. september 2012 doc id 023561 rev 2 1/8 8 M41TC8025 highly accurate, temperature-compensated serial real-time clock (rtc) with embedded crystal data brief features embedded high-stability 32 khz dtcxo temperature-compensated serial real-time clock ? 5.0 ppm max from -40 to 85 c ? 3.8 ppm max from 0 to 50 c supply voltage ? clock operating & timekeeping: 1.6 to 5.5 v ?i 2 c interface operating: 1.8 to 5.5 v ? temperature compensation: 2.2 to 5.5 v 0.8 a typical current at 3.0 v supply voltage 400 khz i 2 c interface time-of-day alarm (with interrupt) fixed-cycle timer interrupt function time update interrupt function programmable frequency output ? fout = 1 hz, 1 khz and 32 khz registers for seconds, minutes, hours, day-of- week, date (day of month), month and year with automatic leap year compensation programmable temperature compensation intervals (0.5 s, 2 s default, 10 s, 30 s) applications power meters industrial applications description the M41TC8025 is a serial i 2 c real-time clock (rtc) incorporating temperature compensation to maintain accurate timekeeping over the industrial temperature range of -40 to +85 c. in addition to providing date and time (seconds, minutes, hours, day-of-week, date (day of month), month and year), the device also provides an alarm function, fixed-cycle timer, time update interrupt and programmable frequency outputs (1 hz, 1 khz and 32 khz). the M41TC8025 is provided in a 200 mil, 14-pin soic package. so14 14-pin soic table 1. device summary order code accuracy package M41TC8025amc6f 5.0 ppm (-40 to 85 c) 3.8 ppm (0 to 50 c) so14 www.st.com
device overview M41TC8025 2/8 doc id 023561 rev 2 1 device overview figure 1. logic diagram 1. irq is an open-drain output 2. fout is a cmos output figure 2. pinout note: be sure to connect a 0.1 f to 1 f bypass capacitor between v cc and v ss . table 2. pin description pin name description 1 nc no connect. the nc pin can be connected to v cc , gnd or left floating. 2 scl serial clock input 3 fout programmable frequency output (cmos) . the fout pin is hi-z if foe is low. 4 nf no function. the nf pin can be connected to v cc , gnd or left floating. 5 du do not use externally. the du pin must be left floating. 6v cc power supply 7 foe frequency output enable, contro ls the frequency output on fout pin 8 nc no connect. the nc pin can be connected to v cc , gnd or left floating. 9 nf no function. the nf pin can be connected to v cc , gnd or left floating. 10 irq interrupt output (open drain) 11 v ss ground supply 12 nf no function. the nf pin can be connected to v cc , gnd or left floating. 13 sda serial data input/output 14 nc no connect. the nc pin can be connected to v cc , gnd or left floating. & / % 6 3 3 6 # # ) 2 1 3 # , 3 $ ! ! - v & / 5 4 . & ) 2 1 3 # , 3 $ ! 6 3 3 . # 6 # # . & . # . & ! - v $ 5 & / 5 4 & / % . #
M41TC8025 device overview doc id 023561 rev 2 3/8 figure 3. block diagram figure 4. hardware hookup divide by 32768 1 hz i 2 c sda interf ace year month da te day -of-week hours minutes seconds counter counter counter counter counter counter counter non-clock registers temp sensor 32khz temp-compensated osc & capacitor array compensation control alarm timer counter 0 extension reg flag register control reg fout (sqw) 32khz aie irq v cc v ss tie uie scl 32khz 1khz 1hz clock registers day/week alarm hour alarm min alarm date alarm alarm registers timer counter 1 compare 0 - 59 0 - 59 0 - 23 1 - 7 1 - 3 1 1 - 1 2 0 - 99 fixed-cycle timer time update foe interrupt control am045299v2 9 & & 6 & / 6 ' $ 0 7 & 6 & / 6 ' $ 9 v v 9 & & 0 & 8 ! - v % $ 7 ) 2 ( ) 2 8 7 , 5 4 * 3 , 2
package mechanical data M41TC8025 4/8 doc id 023561 rev 2 2 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 5. so14 - 14-lead small outline (200 mils body width) package mechanical drawing 83 4 883 2_b
M41TC8025 package mechanical data doc id 023561 rev 2 5/8 table 3. so14 - 14-lead small outline (200 mils body width) package mechanical data symbol mm in min typ max min typ max a - - 2.25 - - 0.089 a1 0.15 0.20 0.25 0.006 0.008 0.010 a2 1.80 1.90 2.00 0.071 0.075 0.079 a3 0.85 0.95 1.05 0.033 0.037 0.041 b 0.41 - 0.54 0.016 - 0.021 b1 0.40 0.45 0.50 0.016 0.018 0.020 c 0.14 - 0.21 0.006 - 0.008 c1 0.13 0.15 0.17 0.005 0.006 0.007 d1 9.80 9.90 10.00 0.386 0.390 0.394 d (1) 10.05 10.15 10.25 0.396 0.400 0.404 e 7.30 7.45 7.60 0.287 0.293 0.299 e1 5.20 5.30 5.40 0.205 0.209 0.213 e1.27 0.050 l 0.30 0.50 0.70 0.012 0.020 0.028 l1 1.07 ref. 0.042 ref. r 0.07 - - 0.003 - - r1 0.07 - - 0.003 - - 10 - 8 0 - 8 2 13 15 17 13 15 17 3 6 8 10 6 8 10 4 9.5 11.5 13.5 9.5 11.5 13.5 5 6 8 10 6 8 10 1. dimension ?d? includes mold flash.
part numbering M41TC8025 6/8 doc id 023561 rev 2 3 part numbering table 4. ordering information scheme for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: m41tc 8025 a mc 6 f device family m41tc device type 8025 accuracy a = 5.0 ppm (-40 to 85 c) 3.8 ppm (0 to 50 c) package mc = so14 temperature range 6 = ?40 c to 85 c shipping method f = ecopack ? package, tape & reel
M41TC8025 revision history doc id 023561 rev 2 7/8 4 revision history table 5. document revision history date revision changes 21-aug-2012 1 initial release. 21-sep-2012 2 modified title of document; updated figure 3: block diagram .
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