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SM3322ARA optical sensor ic seiko npc corporation - 1 overview the SM3322ARA is a fluorescence detector ic with a built-in single picture element (pixel) photodiode of 1mm 2 and programmable signal conditioning circuit. the ic has an optical filter on chip with target condition 640nm 60nm, and it integrates all the elements required for optical sensor into an ultra-miniature package. the signal condition circuit has a programmable gain amplifier wit h dark current compensation circuit, so that it can operate in wider temperature range. with 3 addressing bits, up to 8 SM3322ARA can be paralleled. features package dimensions ? optical filter on chip with target condition: 640nm 60nm (unit: mm) ? dark current compensation circuit built-in for stable signal output ? gain setting and output control function using serial interface (data, se, clk, oe) ? connection up to 8 devices in parallel according to 3-bit address setting ? transimpedance range: 500k to 240m ? photodiode detector size: 2.3mm0.6mm (1.0mm 2 photodetector surface area) ? anti-reflection film coating reduces responsivity fluctuations due to wavelength ? supply voltage range: 2.7 to 5.5v (single supply) ? current consumption: 1.5ma (typ)@v dd =5v, no load ? operating temperature range: -40 to +85c ? package: 12 pin hcob ordering information device package SM3322ARA 12 pin hcob typical application circuit photodiode detector a b 3.2 0.1 x y 1.15 0.2 0.35 0.25 0.6 5.5 0.1 a b photodiode detector dimensions(origin:package center) xy -1.15 1.15 -0.7 -0.1 package type : 12pin hcob package size : 3.2mm5.5mm photodiode detector size : 2.3mm0.6mm (1.0mm 2 photo detector surface area) 0.5 0.1 0.05 vss ref a0 a1 a2 out clk se vdd adc cpu SM3322ARA ic1 SM3322ARA ic2 SM3322ARA ic3 oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data adc
SM3322ARA seiko npc corporation - 2 pinout (top view) pin description no. name i/o description 1 vss s ground 2 ref o reference voltage 3 a0 i address setting input 0 4 a1 i address setting input 1 5 a2 i address setting input 2 6 out o analog output 7 vdd s supply voltage 8 se i serial i/f enable input 9 clk i serial i/f clock input 10 oe i output enable control 11 data i/o serial i/f data input/output 12 nc - leave open-circuit for normal use *. i/o: input/output pin i: input pin o: output pin s: supply pin block diagram 123456 7 8 9 10 11 12 vss ref a0 a1 a2 out vdd se clk oe data nc sample & hold offset cancel out buffer post amplifier dark current compensation serial interface timing generator reference voltage source se a0 a1 a2 clk data ref vdd oe pre amplifier vss photodiode
SM3322ARA seiko npc corporation - 3 specifications absolute maximum ratings v ss =0v parameter symbol conditions rating unit supply voltage *1 v dd vdd pin -0.3 to +7.0 v input voltage *1 v in data, clk, se, oe, a0, a1, a2 pins -0.3 to v dd *3 +0.3 v output voltage *1 v out out, ref pins -0.3 to v dd *3 +0.3 v storage temperature *2 t stg -55 to +90 c *1. these ratings must not be exceeded, not even momentarily. if a rating is exceeded, there is a risk of ic failure, deteriora tion in characteristics, and decrease in reliability. *2. store separately in nitrogen or vacuum atmosphere. *3. recommended operating conditions vdd level. recommended operating conditions the recommended operating conditions are the conditions fo r which the electrical characteristics are guaranteed. vss=0v parameter symbol conditions min typ max unit supply voltage v dd 2.7 5.0 5.5 v out output load *1 - - 100 pf ref output load *1 - - 100 pf operating temperature t a -40 - 85 c *1. the output load of the out and ref outputs presumes capacitive load only. for current load, an error in the output voltage occurs, so the outputs must be used under high-impedance conditions. note. since it may influence the reliability if it is used out of range of recommended operati ng conditions, this product shou ld be used within this range. electrical characteristics dc characteristics recommended operating conditions using reference circuit, unless otherwise noted parameter symbol conditions min typ max unit current consumption i dd oe=0v, no output load - 1.5 3.0 ma logic input voltage 1 v ih1 data,clk,se,a0,a1,a2 pins 0.8v dd - - v v il1 - - 0.2v dd logic input voltage 2 v ih2 oe pin 0.8v dd - - v v il2 - - 0.2v dd logic input current 1 i ih1 data,clk,se, a0,a1,a2 pins v ih = v dd - - 1 a i il1 v il = 0v -1 - - logic input current 2 i ih2 oe pin, vdd=5.0v v ih = v dd - 10 20 a i il2 v il = 0v -20 -10 - logic output impedance z data data pin, read mode - - 400 ? ref output voltage v ref load capacitance < 100pf *1 0.08v dd 0.10v dd 0.12v dd v out maximum output voltage v out h 0.60v dd 0.70v dd - v output impedance z o out pin *2 - 400 1000 ? *1. if a large load capacitance is connected to ref, the ref voltage may begin to oscillate. accordingly, the load capacitanc e connected to the ref output should be 100pf or lower. *2. the output impedance z o is given by the following equation, where v10 is the output voltage for 10k ? load resistance and v0 is the output voltage with no load. z o = (v0/v10-1)*10 [k ? ]
SM3322ARA seiko npc corporation - 4 photodiode characteristics recommended operating conditions using refe rence circuit, unless otherwise noted. parameter *1 symbol conditions min typ max unit photodetector sensitivity 1 *1 s1/s4 375nm - - 5 % photodetector sensitivity 2 *1 s2/s4 525nm - - 30 % photodetector sensitivity 3 *1 s3/s4 545nm - - 60 % photodetector sensitivity 4 *1 s4 630nm 0.16 0.23 - a/w photodetector sensitivity 5 *1 s5/s4 735nm - - 60 % photodetector sensitivity 6 *1 s6/s4 780nm - - 35 % *1. typical characteristics determined on standalone device. photodiode spectral responsivity photodiode spectral responsivity (500nm~800nm) wavelen g th [ nm ] wavelen g th [ nm ] photodiode spectral responsivity characteristic (typ) photodiode spectral responsivity characteristic (typ) responsivity [a/w] responsivity [a/w]
SM3322ARA seiko npc corporation - 5 analog electrical characteristics recommended operating conditions using refe rence circuit, unless otherwise noted. parameter symbol conditions min typ max unit preamplifier transimpedance *1 cs[00] ts[00] - 0.5 - m ? cs[01] - 1.0 - m ? cs[10] - 2.0 - m ? cs[11] - 4.0 - m ? cs[00] ts[01] - 1.5 - m ? cs[01] 3.0 - m ? cs[10] - 6.0 - m ? cs[11] - 12.0 - m ? cs[00] ts[10] - 3.5 - m ? cs[01] - 7.0 - m ? cs[10] - 14.0 - m ? cs[11] - 28.0 - m ? cs[00] ts[11] - 7.5 - m ? cs[01] - 15.0 - m ? cs[10] - 30.0 - m ? cs[11] - 60.0 - m ? preamplifier conversion time ts[00] - 20 30 s ts[01] - 40 60 s ts[10] - 80 120 s ts[11] - 160 240 s postamplifier gain error - - 1 db dark voltage ref reference, [01111111] below -40 - 40 mv ref reference, [11111111] below -60 - 80 mv *1. design value: preamplifier transimpedance is determined by specifying the preamplifier f eedback capacitance (cs[1:0]) and preamplifier conversion time (ts[1:0]). this is a virtual impeda nce called the preamplifier transimpedance. the preamplifier transimpedance (rti) is calculated using the following equation. the sample and hold circuit is synchronized to the preamplifier conversion time. to determine the output voltage, the sample an d hold circuit must complete one full cycle after photoirradiation. the photoirradiation time should be set to a value equal to or gre ater than the detection time (double the maximum preamplifier conversion time) + analog output capture time. if photoirradiation ends before analog output capture, the output voltage may drop or fall to zero. p hotoirradiation should be continuous until analog output capture is completed. . preamplifier conversion time ts[00] ts[01] ts[10] ts[11] detection time 60 s 120 s 240 s 480 s output voltage = v ref + (rti photodiode photocurrent postamplifier gain) photoirradiation time detection time serial interface light source gain setting time analog output capture time output control time analog output load e capacitanc feedback er preamplifi sec) 10 time conversion er preamplifi ( ? = rti
SM3322ARA seiko npc corporation - 6 ac characteristics data write mode recommended operating conditions using refere nce circuit, unless otherwise noted. parameter symbol conditions min typ max unit write clock low-level pulse width twlw clk pin 40 - - ns write clock high-level pulse width twhw clk pin 40 - - ns data setup time 1 tsu1 between se-clk 40 - - ns data setup time 2 tsu2 between data-clk 40 - - ns data hold time 1 th1 between se-clk 140 - - ns data hold time 2 th2 between data-clk 40 - - ns write clock frequency fclkw - - 10 mhz settling time tst out pin, 100pf load, 1v output amplitude variation, time to reach 95% level - - 2 s output disable time *1 tz out pin - 0.1 - s input capacitance *2 c i se,oe,clk,data pins - 5 - pf output capacitance *2 c o out pin - 5 - pf interface wait time tsi 100 - - ns *1. design value: provided as a measure for the output control time. *2. design value: indicates the terminal capacitance per pin. provided as a guide for when designing the circuit board. low/high-level switch timing measured with respect to 0.5v dd reference level, unless otherwise noted. data read mode recommended operating conditions using refere nce circuit, unless otherwise noted. parameter symbol conditions min typ max unit read clock low-level pulse width twlr clk pin 500 - - ns read clock high-level pulse width twhr clk pin 500 - - ns read clock frequency fclkr - - 1 mhz se hold time tse between se-clk 500 - - ns read-out data delay time trd data pin, 100pf load - - 400 ns low/high-level switch timing measured with respect to 0.5v dd reference level, unless otherwise noted. oe se data clk twlw twhw tsu1 tsu2 th1 th2 1/fclkw tz tst out 95% 100% r/w a2 123 1516 a1 gs1 gs0 tsi se data clk twlr twhr 1/fclkr a2 r/w a1 123 8 91516 trd 7 gs0 gs1 cs1 cs0 - - tse oe "l" or open tzz
SM3322ARA seiko npc corporation - 7 functional description basic function the SM3322ARA detects the current generated from a photodiode and outputs a voltage signal. the transimpedance of the preamplifier can be adjusted for coar se adjustment of the responsivity. the transimpedance adjustment range is 0.5 to 60m ? , set using 4 adjustment bits. also, a dark current compensation circuit is used to compensate photodiode output under dark lighting conditions for output voltage stability with low temperature variation. the gain of the postamplifier can be adjusted for fine adjustment of the responsivity. the gain adjustment range is 1 to 4 time s, set using 4 adjustment bits. also, a built-in offset cancel circuit is used to provide low offset voltage at the output. the output voltage when there is no photoirradiation, called the dark voltage, is 0.1v dd . the maximum output voltage with photoirradiation is 0.7v dd . the device can be addressed using address pi n control. this function allows the transimpedance and gain settings to be adjusted for each device independently when multiple devices are connected in parall el. an output enable control (oe) is used for output control. [address and a[2:0] setting] address a2 setting a1 setting a0 setting [000] vss vss vss [001] vss vss vdd [010] vss vdd vss [011] vss vdd vdd [100] vdd vss vss [101] vdd vss vdd [110] vdd vdd vss [111] vdd vdd vdd serial interface the SM3322ARA use a 3-wire serial interface (se, clk, data) to acce ss the device and to set an internal register to control dev ice operation. note that extraneous signal input on the serial interfa ce pins must be avoided when not reading/writing data to the device to prevent incorrect operation. internal register structure the device read/write mode, address, operating mode, preamplifier transimpedance, and postamplifier gain are set in an internal register. the device can be accessed for writing data to or reading data from the register when the a[2:0] address write data bits match the setting of the address control inputs (a2 to a0). note that register data must be configured before using the device. address data rw a2 a1 a0 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 r/w address don?t care preamplifier transimpedance postamplifier gain feedback capacitance conversion time - - - - cs1 cs0 ts1 ts0 gs3 gs2 gs1 gs0 (1) rw read/write mode set bit. set to ?1? for read mode, and to ?0? for write mode. (2) address a[2:0] (a2 to a0) address bits. (3) preamplifier transimpedance cs[1:0] (d7 to d6) and ts[1:0] (d5 to d4) preamplifier transimpedance setting bits (4) postamplifier gain gs[3:0] (d3 to d0) postamplifier gain setting bits
SM3322ARA seiko npc corporation - 8 [adjustment bit assignment] out pin control the out pin is controlled by the level of the oe control pin. oe pin out pin conditions 0.8v dd output enable normal operation output when a[2:0] write data matches the setting of the address control inputs. open output enable normal operation output 0.2v dd output disable gs3 gs2 gs1 gs0 0 0 0 0 1.00 cs1 cs0 0 0 0 1 1.08 0 0 20.0 0 0 1 0 1.17 0 1 10.0 0 0 1 1 1.27 1 0 5.0 0 1 0 0 1.38 1 1 2.5 0 1 0 1 1.50 0 1 1 0 1.63 0 1 1 1 1.78 1 0 0 0 1.94 1 0 0 1 2.13 ts1 ts0 1 0 1 0 2.33 0 0 20 1 0 1 1 2.57 0 1 40 1 1 0 0 2.85 1 0 80 1 1 0 1 3.17 1 1 160 1 1 1 0 3.55 1 1 1 1 4.00 postamplifier gain gain (times capacitance (pf) preamplifier feedback capacitance cs[1:0] time (s) ts[1:0] gs[3:0] preamplifier conversion time
SM3322ARA seiko npc corporation - 9 gain setting (register write mo de, oe = low or open-circuit) if oe is low or open circuit, serial inte rface operation starts when se goes high. write data comprises 1 read/write mode bit (write mode = 0), 3 address bits, and 12 write data bits transferred in sequence. if the address data bits match the address control pin settings (meaning the device is addressed), the write data is loaded into the register, and the write data becomes valid and serial interface operation ends when se goe s low. note that data will be corrupted if there are less tha n or more than 16 clock pulses received during serial data transfer. register write (when oe is low) register write (when oe is open-circuit) analog output control (register write mode, oe = high) if oe is high, serial interface ope ration starts when se goes high. write data comprises 1 read/write mode bit (write mode = 0), 3 address bits, and 4 dummy data bits transferred in sequence. the address data becomes valid and serial interface operation ends when se goes low. if the address data bits match the address control pin settings (meaning the device is addressed), the output is enabled. if the output was already enabled and the address data does not match the address pin settings, the output is disabled. note that if there are less than or more than 8 clock pulses received during serial data transfer, an address mismatch occurs and the output is disabled. in addition, sequential write cycles to th e register are permitted while oe is high. register write (when oe is high) oe se data clk a2 a1 a0 r/w - cs1 cs0 ts1 ts0 gs3 gs2 gs1 gs0 1234 5 6 7 8 9 10 11 12 13 14 15 16 "l" - - - oe se data clk out a2 a1 a0 r/w - cs1 cs0 ts1 ts0 gs3 gs2 gs1 gs0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 "l" (open) (hi-z) - - - oe se data clk out a2 a1 a0 r/w - 1234 5 6 78 (hi-z) - - -
SM3322ARA seiko npc corporation - 10 reading data from the register (oe = low or open-circuit) serial interface operation starts when se goes high. read data comprises 1 read/write mode bit (read mode = 1), 3 a ddress bits, and 4 dummy data bits transferred in sequence when o e is open-circuit or goes low. the address control pin setting is comp ared with the address register setting on the falling edge of the 8 th clk pulse. if the settings match (meaning the device is addressed), the data in the 8-bit analog adjustment code register is read o ut in sequence. on the serial interface, the gs0 data bit is transferred on the 15 th falling edge of clk, and then any data bits transferred between the 16 th falling edge of clk and the falling edge on se are undefined data . serial interface operation ends when se goes low, and the da ta terminal reverts to an input. make sure there are not less than nor more than 16 input pulses on the clk clock. if the number o f clock pulses is incorrect, incorrect data may be written to the register or read from the register. register read se data clk a2 a1 a0 r/w - cs1 cs0 ts1 ts0 gs3 gs2 gs1 gs0 1234 5678910111213141516 - - - -
SM3322ARA seiko npc corporation - 11 reference circuit device with [000] address setting connect a laminated ceramic capacitor of 10 f or larger as close as possible to the supply voltage terminals. the nominal value rating for each electrical characterist ics parameter is measured using the reference circuit. vss ref a0 a1 a2 out clk se vdd SM3322ARA oe data adc 10 f cpu
SM3322ARA seiko npc corporation - 12 typical application circuits the typical application circuits are provided for reference only, and do not represent a guarantee of circuit operation. we acc ept no liability for any damage resulting from the use of these circuits. always use devices after sufficient evaluation under actual operating conditions. circuit 1 timing diagram oe se data clk ? rti out(ic1) out(ic2) out(ic3) out? ic1 ic2 ic3 (off) (on) (hi-z) (hi-z) (hi-z) (hi-z) ic1 ic2 ic3 (optical irradiation) out(all) vss ref a0 a1 a2 out clk se vdd adc cpu SM3322ARA ic1 SM3322ARA ic2 SM3322ARA ic3 oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data adc
SM3322ARA seiko npc corporation - 13 circuit 2 example with 9 or more devices connected in parallel timing diagram oe(b) se(b) data clk ? rti out(ic a1) out(ic a2) out(ic b1) ic a1 (off) (on) (hi-z) (hi-z) (hi-z) ic a1 ic a8 ic b1 ic b8 se(a) oe(a) ic a2 ic a3 ic a1 ic a2 ic a3 out(ic b2) (hi-z) (optical irradiation) cpu vss ref a0 a1 a2 out clk se vdd SM3322ARA ic a1 SM3322ARA ic b1 SM3322ARA ic b2 SM3322ARA ic b8 SM3322ARA ic a2 SM3322ARA ic a8 oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data vss ref a0 a1 a2 out clk se vdd oe data adc adc
SM3322ARA seiko npc corporation - 14 please pay your attention to the following points at time of using the products shown in this document. 1. the products shown in this document (hereinafter ?produc ts?) are designed and manufactured to the generally accepted standar ds of reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and measurement equipment. the products are no t designed and manufactured to be used in any other special equipment requiring extremely high level of reliability and safety, such as aero space equipment, nuclear power control equipment, medical equipment , transportation equipment, disaster prev ention equipment, security equipment. the products are not designed and manufactured to be used for the apparatus that exerts harmful influence on the huma n lives due to the defects, failure or malfunction of the produ cts. if you wish to use the products in that apparatus, please contact our sales section in advance. in the event that the products are used in such apparatus wi thout our prior approval, we assume no responsibility whatsoever for any damages resulting from the use of that apparatus. 2. npc reserves the right to change the specifications of the pr oducts in order to improve the c haracteristics or reliability t hereof. 3. the information described in this document is presented only as a guide for using the products. no responsibility is assumed by us for any infringements of patents or other rights of the third parties whic h may result from its use. no license is granted by implicati on or otherwise under any patents or other rights of the third parties. then, we assume no responsibility whatsoever for any damages resulting from that infringements. 4. the constant of each circuit shown in this document is descri bed as an example, and it is not guaranteed about its value of the mass production products. 5. in the case of that the products in this document falls unde r the foreign exchange and foreign trade control law or other ap plicable laws and regulations, approval of the export to be based on those laws and regulations are necessary. cu stomers are r equested appropriat ely take steps to obtain required permissions or approvals from appropriate government agencies. seiko npc corporation 1-9-9, hatchobori, chuo-ku, tokyo 104-0032, japan telephone: +81-3-5541-6501 facsimile: +81-3-5541-6510 http://www.npc.co.jp/ email:sales@npc.co.jp nd14019-e-00 2014.11

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