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1/32 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ambient light sensor ics 1 chip optical proximity sensor + ambient light sensor ic bh1771glc descriptions bh1771glc is the ic into which optical proximity sensor and digital ambient light senor are unified. proximity sensor part detects the human or object approach by re flection of infrared led(irled) light. and this device can drive maximum 3 irleds, and touch-less motion detection function c an be implemented. ambient light part c an detect the wide range illuminance from the dark up to under direct sun light. the illuminant intensity of lcd display and keypad can be adjusted, so lower current consumption or higher visibility are possible. features 1) correspond to i 2 c bus interface ( f/s mode & hs mode support ) 2) low current by power down function 3) correspond to 1.8v logic interface 4) als spectral responsibility is approximately human eye response ( peak wavelength : typ. 550nm ) 5) correspond to wide range of light intensity ( 1-65535 lx range ) 6) rejecting 50hz/60hz light noise (als function) 7) detection range of proximity sensor is around 10 - 100mm (configurable by i 2 c bus) 8) touch-less motion detection function 9) built in ambient light cancelation (proximity sensor function) 10) built in configurable irled current driver applications mobile phone, dsc, portable game, camcoder , car navigation, pda, lcd display etc. absolute maxi mum ratings ( ta = 25 ) parameter symbol ratings units vcc, supply voltage vccmax 4.5 v sda,scl,gndnc terminal voltage vsdamax, vsclmax, vgndncmax 4.5 v led1,led2,led3 int terminal voltage vledmax, vintmax 7 v operating temperature topr -40 85 storage temperature tstg -40 100 sda, int sink current imax 7 ma power dissipation pd 250 mw 70mm 70mm 1.6mm glass epoxy board. decreasing rate is 3.33mw/ for operating above ta=25 operating conditions parameter symbol ratings units min. typ. max. vcc voltage vcc 2.3 2.5 3.6 v led1,led2,led3 terminal voltage vled 0.7 2.5 5.5 v no.11046ebt11
technical note 2/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. electrical characteristics ( vcc = 2.5v, ta = 25 , unless otherwise noted. ) parameter symbol limits units conditions min. typ. max. supply current for als icc1 90 180 a ev = 100 lx 1 average current when als_control register(40h) = ? 03h ? and the other registers are default. supply current for ps icc2 90 180 a average current when ps_control register(41h) = ? 03h ? and the other registers are default. supply current for ps during driving led current icc3 6.5 8.5 ma standby mode current icc4 0.8 1.5 a als & ps standby no input light f/s mode als measurement time tmals 100 125 ms h-resolution mode als measurement accuracy s/a 0.85 1.0 1.15 times sensor out / actual lx, ev = 1000 lx 1 als dark ( 0 lx ) sensor out als0 0 0 2 count h-resolution mode ps sensor out (no proximity object) ps0 0 0 9 count ambient irradiance = 0 w/cm 2 ps sensor out ( irradiance by proximity object = 324 w/cm 2 ) ps324u 120 128 136 count ambient irradiance = 0 w/cm 2 iled pulse duration twiled 200 250 s cumulative iled pulse duration twiled2 1 1.25 ms iled register(42h) [7:6] = ?11? ps measurement time tmps 10 12.5 ms led1 terminal sink current at led1 terminal voltage = 1.3v iled1 18 20 22 ma iled register(42h) [2:0] = ? 010 ? led2 terminal sink current at led2 terminal voltage = 1.3v iled2 18 20 22 ma iled register(42h) [5:3] = ? 010 ? led3 terminal sink current at led3 terminal voltage = 1.3v iled3 18 20 22 ma iled3 register(43h) [2:0] = ? 010 ? int output ?l? voltage vint 0 0.4 v iint = 3ma scl sda input 'h' voltage vih 1.26 v scl sda input ?l? voltage vil 0.54 v scl sda input 'h'/?l? current iihl -10 10 a i 2 c sda output ?l? voltage vol 0 0.4 v iol = 3ma 1 white led is used as optical source
technical note 3/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. i 2 c bus timing characteristics ( vcc = 2.5v, ta = 25 , unless otherwise noted. ) parameter symbol limits units conditions min. typ. max. i 2 c scl clock frequency f scl 0 400 khz f/s mode i 2 c scl clock frequency2 f sclh 0 3.4 mhz hs mode cb=100pf i 2 c hold time ( repeated ) start condition t hd;sta 0.6 s f/s mode i 2 c hold time ( repeated ) start condition2 t hd;sta 160 ns hs mode i 2 c ?l? period of the scl clock t low 1.3 s f/s mode i 2 c ?l? period of the scl clock2 t low 160 ns hs mode i 2 c 'h' period of the scl clock t high 0.6 s f/s mode i 2 c 'h' period of the scl clock2 t high 60 ns hs mode i 2 c set up time for a repeated start condition t su;sta 0.6 s f/s mode i 2 c set up time for a repeated start condition2 t su;sta 160 ns hs mode i 2 c data hold time t hd;dat 0 s f/s mode i 2 c data hold time2 t hd;dat 0 70 ns hs mode cb=100pf i 2 c data setup time t su;dat 100 ns f/s mode i 2 c data setup time2 t su;dat 10 ns hs mode i 2 c set up time for stop condition t su;sto 0.6 s f/s mode i 2 c set up time for stop condition2 t su;sto 160 ns hs mode i 2 c bus free time between a stop and start condition t buf 1.3 s i 2 c data valid time t vd;dat 0.9 s f/s mode i 2 c data valid acknowledge time t vd;ack 0.9 s f/s mode
technical note 4/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. package outlines a production code lot no. b wlga010v28
technical note 5/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. reference data 0 0.5 1 1.5 2 fluorescent light incandescent light halogen light kripton light artifical sun light white led ratio 0 8 16 24 32 40 48 56 64 0 8 16 24 32 40 48 56 64 illuminance [ lx ] measurement result 0.0 0.2 0.4 0.6 0.8 1.0 1.2 400 500 600 700 800 900 1000 1100 wavelength [ nm ] ratio fig.8 als light source dependency ( fluorescent light is set to '1' ) 1 10 100 1000 10000 100000 1 10 100 1000 10000 100000 illuminance [ lx ] measurement result fig.4 als directional characteristics 1 fig.5 als directional characteristics 2 fig.6 als dark response w???? 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 ta [ ] measurement result 0 50 100 150 200 22.533.54 vcc [ v ] icc @ measurement [ ua ] 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio - + - + 1pin fig.7 als measurement accuracy temperature dependency fig.3 illuminance - als measurement result 2 fig.9 vcc - icc ( during als measurement ) fig.1 als spectral response fig.10 als measurement result vcc dependency 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 ang le [ deg ] ratio - + - + 1pin fig.2 illuminance - als measurement result 0.00 0.20 0.40 0.60 0.80 1.00 1.20 400 500 600 700 800 900 1000 1100 wavelength [nm] ratio fig.11 ps spectral response fig.12 ps directional characteristics 1 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio - + - + 1pin 0 0.2 0.4 0.6 0.8 1 1.2 -40 -20 0 20 40 60 80 100 ta [ ] ratio 0 0.2 0.4 0.6 0.8 1 1.2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 vcc [ v ] ratio
technical note 6/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 100 110 120 130 140 150 -40 -20 0 20 40 60 80 100 ta [] ps_dataout [count] 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio - + - + 1pin 0.1 1 10 -40-20 0 20406080100 ta [ ] icc @ power down [ ua ] fig.18 vcc ? icc@0 lx ( power down ) 0 40 80 120 160 200 240 0123456 vledc [v] iledc[ma] fig.16 vledc ? iledc@ iled is set 200ma by iled register fig.17 vledc ? iledc@ iled is set 20ma by iled register 0 4 8 12 16 20 24 0123456 vledc [v] iledc[ma] 0 20 40 60 80 100 120 140 160 180 200 220 240 260 0.001 0.01 0.1 1 10 100 1000 irradiance(mw/cm2] ps_dataout fig.14 irradiance ? ps_dataout fig.15 vcc - icc ( during ps measurement ) fig.13 ps directional characteristics 2 0 50 100 150 200 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 vcc [ v ] icc @ measurement [ ua ] 0 40 80 120 160 200 0 50 100 150 object distance [mm] ps_dataout [count] 18 kodak graycard 90 white paper human hand iled=200ma led : sim-030st center to center : 10mm between bh1771glc and sim-030st fig.20 object distance ? ps_dataout of different reflector 0 40 80 120 160 0 50 100 150 object distance [mm] ps_dataout [count] sim-040st sim-030st iled=200ma reflector: 18%kodak graycard center to center : 10mm between bh1771glc and infrared led fig.22 object distance ? ps_dataout of different infrared led 0 40 80 120 160 200 0 50 100 150 object distance [mm] ps_dataout [count] a=10mm a=20mm a=30mm a=50mm a=70mm a=5mm fig.23 object distance ? ps_dataout of different distance between bh1771glc and sim-030st iled=200ma led : sim-030st reflector : 18%kodak graycard center to center : a between bh1771glc and infrared led fig.19 ps sensor out temperature dependency (irradiance by proximity object = 324 w/cm 2 ) 0 40 80 120 160 0 50 100 150 object distance [mm] ps_dataout [count] iled=200ma iled=50ma iled=100ma led : sim-030st reflector : 18%kodak graycard center to center : 10mm between bh1771glc and sim-030st fig.21 object distance ? ps_dataout of different iled
technical note 7/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 20 40 60 80 100 120 140 -100 -50 0 50 100 position of reflector [mm] ps_dataout [count] 0 20 40 60 80 -100 -50 0 50 100 position of reflector [mm] ps_dataout [count] ? fig.24-27 are ps_dataout measurement results which depend on the position of the reflector. the reflector is a white paper of reflectivity 90% and this size is 50mm50mm. the characteristic of 90%white paper is nearly similar to human hand(human palm). 1) the reflector moves to the parallel dire ction for the position of bh1771glc and led. 2) the reflector moves to the vertical dire ction for the position of bh1771glc and led. direction of reflector movement 0 20 40 60 80 -100 -50 0 50 100 position of reflector [mm] ps_dataout [count] 0 20 40 60 80 100 120 140 -100 -50 0 50 100 position of reflector [mm] ps_dataout [count] fig.26 position of reflector ? ps_dataout height of reflector is 50mm fig.27 position of reflector ? ps_dataout height of reflector is 100mm measurement conditions ? iled=200ma ? led : sim-030st ? reflector : 90%white paper 50mm 50mm ? center to center : a (between bh1771glc and sim-030st) ? ambient irradiance = 0 w/cm 2 a=70mm a=50mm a=30mm a=10mm a=70mm a=50mm a=30mm a=10mm reflector bh1771glc pcb height of reflector led : sim-030st - + a 0 50mm 50mm reflector led : sim-030st bh1771glc 1pin a 0 +a/2 -a/2 50mm 50mm reflector direction of reflector movement led : sim-030st bh1771glc 1pin fig.24 position of reflector ? ps_dataout height of reflector is 50mm measurement conditions ? iled=200ma ? led : sim-030st ? reflector : 90%white paper 50mm 50mm ? center to center : a (between bh1771glc and sim-030st) ? ambient irradiance = 0 w/cm 2 fig.25 position of reflector ? ps_dataout height of reflector is 100mm reflector bh1771glc pcb height of reflector a=70mm a=50mm a=30mm a=10mm a=70mm a=50mm a=30mm a=10mm
technical note 8/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. i 2 c bus communication 1) slave address "0111000" 2) main write format 1. case of ?indicate register address? st slave address 0111000 w 0 ack indicate register address 010xxxxx ack sp 2. case of "write to data register after indicating register address" st slave address 0111000 w 0 ack indicate register address 010xxxxx ack data specified at register address field ack ?????? ack data specified at register address field + n ack sp bh1771glc continues to write data with address increments until master i ssues stop condition. write cycle is 40h - 41h - 42h - 43h - 44h - 45h - 46h ? 52h ??? 5dh ? 5eh - 40h ??? ex ) if register address field is 45h, then bh1771glc writes data like seeing in below. 45h - 46h -52h ??? 5dh ? 5eh - 40h???it is c ontinued until master issues stop condition. 3) main read format 1. case of read data after indicate register address and read data ( master issues restart condition ) st slave address 0111000 w 0 ack indicate register address 010xxxxx ack st slave address 0111000 r 1 ack data specified at register address field ack data specified at register address field + 1 ack ?????? ack data specified at register address field + n nack sp 2. case of read data after selecting register address st slave address 0111000 r 1 ack data specified at register address field ack data specified at register address field + 1 ack ?????? ack data specified at register address field + n nack sp bh1771glc outputs data from specified address field until master i ssues stop condition. read cycle is 40h - 41h - 42h - 43h - 44h - 45h - 46h ? 4ah ??? 5dh ? 5eh - 40h ??? ex ) if register address field is 4ch, then bh1771glc outputs data like seeing in below. 4ch - 4dh -4eh ??? 5dh ? 5eh - 40h???it is c ontinued until master i ssues stop condition. bh1771glc operates as i 2 c bus slave device. please refer formality i 2 c bus specification of nxp semiconductors from master to slave from slave to master
technical note 9/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. block diagram and block explanation ? i 2 c interface i 2 c bus interface. f/s mode and hs mode is suppor ted. 1.8v logic inte rface is supported. ? por power on reset function. ? osc internal oscillator. ? timing controller internal management block for proximity sensor and ambient light sensor. ? int interface int terminal control block. details are on page 14 - 16 ? data registers register for strage of measurement resu lts or commands. details are on page 17. ? ps control logic this block controls proximity sensor analog block ? led pulse gen led current generator. led current value is config urable by iled( 42h ) and iled3( 43h ) register. ? irled drivers. irled driver block. active led termi nal is set by iled( 42h ) register. ? pd_als photo diode for ambient light sensor. p eak wavelength is approximately 550nm. ? 16bit adc ad converter for als. ? als control logic this block controls ambient light sensor analog block. ? pd_ps photo diode for proximity sensor. peak wavelength is approximately 850nm. ? dc light rejection amp dc light is rejected in this block. and generated infrared pulse is passed to linear adc block. ? linear adc ad converter for proximity sensor. detection range is very wide ( 1 w/cm 2 - 100mw/cm 2 ). ? linear/log converter linear to logarithm converter for proximity sensor. output data is 8bit. ps irradiance calculation example is on page 26. int sda scl led3 reflector ambient light ambient li g ht sensor proximit y sensor 16bit adc vcc timing controller led1 dc light rejection amp irled drivers led2 irled osc i 2 c interface vdd led vdd led vdd led por linear / log converter als control logic ps control ::?:?::o ::?:? :::?::? :?:?:?:? :?:?:?:? :?:?:?:::?:?:: ::?:?:?::a ::?:?::a :?::? interface gnd linear adc gndnc gnd_led irled irled
technical note 10/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. example of application circuit diagram if you do not use the int pin, please connect to gnd or opening (non connect). 1) in case of using 1irled if you do not use the led2 or led3, please connect to vdd_led or opening (non connect). 2) in case of using 3 irleds gndnc int sda scl led3 ambient li g ht sensor proximit y sensor 16bit adc vcc timing controller led1 dc light rejection amp irled drivers led2 osc i 2 c interface por linear / log converter als control logic ps co n t r o l logic led pulse gen data pd_als pd_ps int interface gnd linear adc gnd_led micro controller or baseband processor 3 10 2 1 4 5 6 7 8 9 i r led ( ex. 10 f) 2.5 - 5.5v gndnc int sda scl led3 ambient li g ht sensor proximit y sensor 16bit adc vcc timing controller led1 dc light rejection amp irled drivers led2 osc i 2 c interface por linear / log converter als control logic ps control ::?:?::o ::?:?:w :::?::?:w :?:?:? data pd_als pd_ps int interface gnd linear adc gnd_led micro controller or baseband processor 3 10 2 1 4 5 6 7 8 9 i r led ( ex. 10 f)
technical note 11/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 3) in case of extending proximity sensor detection distance bh1771glc can drive maximum 200ma(typ) current. by adding simp le external circuit, it is possible to increase irled current and to extend detection distance. in case of driving large current forirled, note that the current value must not be over the absolute maximum rating for irled. gndnc int sda scl led3 ambient li g ht sensor proximit y sensor 16bit adc vcc timing controller led1 dc light rejection amp irled drivers led2 osc i 2 c interface por linear / log converter als control logic ps co n t r o l logic led pulse gen data pd_als pd_ps int interface gnd linear adc gnd_led micro controller or baseband processor 3 10 2 1 4 5 6 7 8 9 i r led ( ex. 10 f) 1kohm pmos ex. rtr030p02 (rohm) * in the case of the following setting for above circuit, led current is proximity 500ma. vdd_led=5v, r1=3.9ohm
technical note 12/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. terminal description pin no. terminal name equivalent circuit function 1 led3 nch open drain led3 terminal. led current and emitting interval is defined by internal register. register value is possible to configure by i 2 c bus. 2 led2 nch open drain led2 terminal. led current and emitting interval is defined by internal register. register value is possible to configure by i 2 c bus. 3 led1 nch open drain led1 terminal. led current and emitting interval is defined by internal register. register value is possible to configure by i 2 c bus. 4 gnd_led gnd terminal for led driver 5 int nch open drain output. interrupt setting is defined by internal register. register value is possible to configure by i 2 c bus. 6 vcc power supply terminal 7 gnd gnd terminal 8 scl i 2 c bus interface scl terminal 9 sda i 2 c bus interface sda terminal 10 gndnc non connect or pull down to gnd if you do not use the int pin, please connect to gnd or opening (non connect). if you do not use the led2 or led3, please connect to vdd_led or opening (non connect). vcc
technical note 13/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. proximity sensor measurement sequence the below figure shows proximity sensor measurement sequence. first ps measurement is triggered by i 2 c bus master writes measurement command to ps_control register ( 41h ). bh1771glc has 3 led-drivers and their combinations are set by iled,iled3 register ( 42h, 43h ). in the case of only led2 is inactive, led3 emit immediately after led1 emittion. 1. forced mode ps measurement is done only 1time and ps trigger bit ( 44h<0> ) is overwritten from 'h' to ?l? after ps measurement complete. ps measurement is re-started by master writes ps trigger bit to 'h'. 2. stand alone mode ps measurement is continuously done un til master select the other mode. measurement interval is defined at ps_meas_rate register ( 45h ). twiled : led current pulse duration, please refer p2 ( electrical characteristics ). twiled2 : cumulative led current pulse duration, please refer p2 ( electrical characteristics ). tmps : proximity sensor measurement time, please refer p2 ( electrical characteristics ). measurement result is generated in this term. ps meas rate: in case of stand alone mode, it is defined at ps_meas_rate register ( 45h ). in case of forced mode, it means the term until overwriting ps trigger bit to ?h?. ambient light sensor measurement sequence the below figure shows ambient light sensor measurement sequence. first als measurement is triggered by i2c bus master writing measurement command to als_control register ( 40h ). 1. forced mode als measurement is done only 1time and als trigger bit( 44h<1> ) is overwritten from 'h' to ?l? after als measurement is completed. als measurement is re-started by master writes als trigger bit to 'h'. 2. stand alone mode als measurement is continuously done until master sele ct the other mode. measurement interval is defined at als_meas_rate register ( 46h ). if als rate disable bit ( 46h<7> ) is ?h?, there is no in terval between measurement. tmals : ambient light sensor measurement time, pl ease refer p2 ( electric al characteristics ). measurement result is generated in this term. als meas rate : in case of stand alone mode, it is defined at als_meas_rate register ( 46h ) in case of forced mode, it means the te rm until overwriting als trigger bit to ?h?. tmals start measurement als meas rate led1 led2 led3 led1 led2 led3 twiled twiled2 tmps ps meas rate start measurement start measurement start measurement
technical note 14/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. interrupt function interrupt function compares als or ps measurement result to pres et interrupt threshold level. ps uses one threshold level or two threshold level ( in hysteresis mode ) and als uses two thre shold level (upper and lower ). interrupt status is monitored by int pin or als_ps_status register ( 4eh ) and interrupt f unction is able to be controlled by interrupt register ( 52h ). interrupt threshold is defined at als_th_up and al s_th_low and ps_th_led and ps_th_l_led registers ( 53h - 59h, 5ch - 5eh ). ps_th_l_led registers are effectiv e when ps hysteresis bit ( 52h<4> ) is ?h?. interrupt persistence function is defined at persistence register ( 5bh ). int pin is nch open drain terminal so this terminal should be pull-up to some kind of voltage source by an external resister. maximum sink current rating of this terminal is 7ma. there are two output modes about interrupt func tion ( latched mode and unlatched mode ). in case of using als and ps interrupt functions at the same time, latch mode is recommended. int terminal is high impedance when vcc is supplied. int terminal becomes inactive by setting interrupt register (52h) [1:0] to ?00?. ( it is not worked during power down mode. power down mode means als_control(40h) <1>=?0? and ps_control(41h)<1> = ?0?.) int terminal keeps just previous state which power down co mmand is sent. so to set int terminal to high impedance is recommended. vcc current(approximately 25 a at vcc=2.5v) is consumed during in t terminal is ?l?. there are two method to set int terminal to high impedance. 1) send software reset command. (write ?h? to als_control(40 h)<2>. software reset is also worked during power down. all registers are initialized by software reset command.) 2) write ?000? to interrupt register(52h)<2:0>. ex1) in case of using ps ?h? threshold interrupt register 52h<4> : ?0? in case of unlatch mode if the measur ement value exceed the ps interrupt thres hold ?h? value, the interrupt becomes active. and if the measurement value goes below the threshold, the interrupt becomes inactive. in case of latch mode once the interrupt becomes active, it keeps the status until end of measurement after interrupt register is read. in case of persistence function is set to active, if the interrupt is inactive, it keeps inactive status until the measurement value is beyond the threshold ?h? value continuously. if the inte rrupt is active, it keeps active status until the measurement value is below threshold ?h? value continuously or unt il end of measurement after interrupt register is read. master reads interrupt register ps interrupt threshold ?h? level time unlatch mode latch mode sequential measurement result unlatch mode persistence = 2 active inactive
technical note 15/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ex2 ) in case of using ps ?h/l? threshold ( interrupt register 52h<4> : ?1?) in case of unlatch mode if the measur ement value exceed the ps interrupt thres hold ?h? value, the interrupt becomes active. and if the measurement value is below the th reshold ?l? value, the interrupt becomes inactive. in case of latch mode once the interrupt becomes active, it keeps the status until end of measurement after interrupt register is read. in case of persistence function is set to active, if the interrupt is inactive, it keeps inactive status until the measurement value is beyond the threshold ?h? value continuously. if the inte rrupt is active, it keeps active status until the measurement value is below threshold ?l? value continuously or unt il end of measurement after interrupt register is read. master reads interrupt register unlatch mode ps interrupt threshold ?h? level ps interrupt threshold ?l? level sequential measurement result time latch mode unlatch mode persistence = 2 active inactive sequential measurement result
technical note 16/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ex3 ) ambient light sensor interrupt function in case of unlatch mode if the measurement value is within the range set by als interrupt threshold ?h? and ?l? value, the interrupt becomes inactive. and if the measurement value is out of the range set by threshold ?h? and ?l? value, the interrupt becomes active. in case of latch mode once the interrupt becomes active, it keeps the status until end of measurement after interrupt register is read. in case that persistence function is set to active, if the interrupt is inactive, it keeps inactive status until the measuremen t value is continuously out of the range set by threshold ?h? and ?l? value. if the interrupt is acti ve, it keeps active status u ntil the measurement value is continuously wi thin the range set by threshold ?h? and ?l? value or until end of measurement after interrupt register is read. master reads interrupt register unlatch mode a ls interrupt threshold ?h? level a ls interrupt threshold ?l? level sequential measurement result time latch mode unlatch mode persistence = 2 active inactive sequential measurement result
technical note 17/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. command set address type register name register function 40h rw als_control als operation mode control and sw reset 41h rw ps_control ps operation mode control 42h rw i_led selection of active led and led1, led2 current setting 43h rw i_led3 led3 current setting 44h rw als_ps_meas forced mode trigger 45h rw ps_meas_rate ps measurement rate 46h rw als_meas_rate als measurement rate 4ah r - reserved 4bh r manufact_id manufacturer id 4ch r als_data_0 als data (low byte) 4dh r als_data_1 als data (high byte) 4eh r als_ps_status measurement data and interrupt status 4fh r ps_data_led1 ps data from led1 50h r ps_data_led2 ps data from led2 51h r ps_data_led3 ps data from led3 52h rw interrupt interrupt setting 53h rw ps_th_led1 ps interrupt h threshold for led1 54h rw ps_th_led2 ps interrupt h threshold for led2 55h rw ps_th_led3 ps interrupt h threshold for led3 56h rw als_th_up_0 als upper threshold low byte 57h rw als_th_up_1 als upper threshold high byte 58h rw als_th_low_0 als lower threshold low byte 59h rw als_th_low_1 als lower threshold high byte 5ah rw als_sensitivity als sensitivity setting 5bh rw persistence int pin interrupt persistence setting 5ch rw ps_th_l_led1 ps interrupt l threshold for led1 5dh rw ps_th_l_led2 ps interrupt l threshold for led2 5eh rw ps_th_l_led3 ps interrupt l threshold for led3
technical note 18/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. als_control ( 40h ) 7 6 5 4 3 2 1 0 res res res res als resolution sw reset als mode default value 00h field bit type description res 7 : 4 rw write 0000 als resolution 3 rw 0 : h-resolution mode, 1 lx step output 1 : m-resolution mode, 4 lx step output sw reset 2 rw 0 : initial reset is not started 1 : initial reset is started als mode 1 : 0 rw 00 : standby mode 01 : don?t use. 10 : forced mode 11 : stand alone mode ps_control ( 41h ) 7 6 5 4 3 2 1 0 x x x x x x ps mode default value 00h field bit type description na 7 : 2 - ignored ps mode 1 : 0 rw 00 : standby mode 01 : don?t use. 10 : forced mode 11 : stand alone mode i_led ( 42h ) 7 6 5 4 3 2 1 0 ps active led2 current led1 current default value 1bh field bit type description ps active 7 : 6 rw 00 : led1 is active, led2,3 are inactive 01 : led1,2 are active, led3 is inactive 10 : led1,3 are active, led2 is inactive 11 : all leds are active led2 current 5 : 3 rw 000 : 5ma 001 : 10ma 010 : 20ma 011 : 50ma 100 : 100ma 101 : 150ma 11x : 200ma led1 current 2 : 0 rw
technical note 19/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. i_led3 ( 43h ) 7 6 5 4 3 2 1 0 x x x x x led3 current default value 03h field bit type description na 7 : 3 - ignored led3 current 2 : 0 rw 000 : 5ma 001 : 10ma 010 : 20ma 011 : 50ma 100 : 100ma 101 : 150ma 11x : 200ma als_ps_meas ( 44h ) 7 6 5 4 3 2 1 0 x x x x x x als trigger ps trigger default value 00h field bit type description na 7 : 2 - ignored als trigger 1 rw 0 : ignored 1 : start als measurement at force mode *2 ps trigger 0 rw 0 : ignored 1 : start ps measurement at force mode *2 *2 even if trigger is set during measuremen t, the measurement doesn?t start. the measurem ent will start, in case that it is set to forced mode by als_control register (40h) or ps_co ntrol register (41h) and is not during measurement.
technical note 20/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ps_meas_rate ( 45h ) 7 6 5 4 3 2 1 0 x x x x ps meas rate default value 05h field bit type description na 7 : 4 - ignored ps meas rate 3 : 0 rw 0000 : 10ms 0001 : 20ms 0010 : 30ms 0011 : 50ms 0100 : 70ms 0101 : 100ms 0110 : 200ms 0111 : 500ms 1000 : 1000ms 1001 : 2000ms 101x : 2000ms 11xx : 2000ms als_meas_rate ( 46h ) 7 6 5 4 3 2 1 0 als rate disable x x x x als meas rate default value 02h field bit type description als rate disable 7 rw 0 : als meas rate( 46h<2:0> ) is active 1 : als meas rate( 46h<2:0> ) is inactive na 6 : 3 - ignored als meas rate 2 : 0 rw 000 : 100ms 001 : 200ms 010 : 500ms 011 : 1000ms 1xx : 2000ms ( 4ah ) 7 6 5 4 3 2 1 0 x x x x x x x x default value 93h field bit type description na 7 : 0 r reserved
technical note 21/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. manufact_id ( 4bh ) 7 6 5 4 3 2 1 0 manufacturer id default value 01h field bit type description manufacturer id 7 : 0 r 00000001 als_data ( 4ch, 4dh ) 7 6 5 4 3 2 1 0 als data default value 00h register address bit type description als data lsbs 4ch 7 : 0 r als data low byte als data msbs 4dh 7 : 0 r als data high byte als_ps_status ( 4eh ) 7 6 5 4 3 2 1 0 als int status als data status led3 int status led3 data status led2 int status led2 data status led1 int status led1 data status default value 00h field bit type description als int status 7 r 0 : als interrupt signal inactive 1 : als interrupt signal active als data status 6 r 0 : als old data (data is already read) 1 : als new data (data is renewed after previous reading) led3 int status 5 r 0 : led3 interrupt signal inactive 1 : led3 interrupt signal active led3 data status 4 r 0 : led3 old data (data is already read) 1 : led3 new data (data is renewed after previous reading) led2 int status 3 r 0 : led2 interrupt signal inactive 1 : led2 interrupt signal active led2 data status 2 r 0 : led2 old data (data is already read) 1 : led2 new data (data is renewed after previous reading) led1 int status 1 r 0 : led1 interrupt signal inactive 1 : led1 interrupt signal active led1 data status 0 r 0 : led1 old data (data is already read) 1 : led1 new data (data is renewed after previous reading) als interrupt signal inactive means that als measurement resu lt is within threshold level set by als_th register(56h, 57h, 58h, 59h). als interrupt signal active means measurement re sult is out of threshold level set by als_th register. ps interrupt signal active means each ps measurement result ex ceeds threshold level defined by ps_th_led register(53h, 54h, 55h). ps interrupt signal inactive means each ps meas urement result does not exceed threshold level set by ps_th_led register. when ps interrupt hysteresis( interrupt r egister 52h<4>) is ?h?, if once interrupt signal becomes active, it is kept until measurement result becomes less than ps_th_l_led( 5ch 5dh 5eh) register value. regarding als and led1, it is possible to set persistence (5bh).
technical note 22/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ps_data_led ( 4fh, 50h, 51h) 7 6 5 4 3 2 1 0 led data default value 00h register address bit type description led1 data 4fh 7 : 0 r ps measurement data for each led led2 data 50h 7 : 0 r led3 data 51h 7 : 0 r interrupt ( 52h ) 7 6 5 4 3 2 1 0 x interrupt source ps interrupt hysteresis output mode interrupt polarity interrupt mode default value 08h field bit type description na 7 - ignored interrupt source 6 : 5 r 00 : first interrupt triggered by als 01 : first interrupt triggered by led1 10 : first interrupt triggered by led2 11 : first interrupt triggered by led3 ps interrupt hysteresis 4 rw 0 : use ps_th_led only. 1 : use ps_th_led and ps_th_l_led for hysteresis output mode 3 rw 0 : int pin is latched until interrupt register is read. 1 : int pin is updated after each measurement. interrupt polarity 2 rw 0 : int pin is logic ?l? when interrupt signal is active 1 : int pin is logic ?l? when interrupt signal is inactive interrupt mode 1 : 0 rw 00 : int pin is inactive. 01 : triggered by only ps measurement 10 : triggered by only als measurement 11 : triggered by ps and als measurement ps_th_led ( 53h, 54h, 55h) 7 6 5 4 3 2 1 0 led threshold default value ffh register address bit type description led1 threshold 53h 7 : 0 rw ps h threshold for each led led2 threshold 54h 7 : 0 rw led3 threshold 55h 7 : 0 rw
technical note 23/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. als_th_up ( 56h, 57h ) 7 6 5 4 3 2 1 0 als upper threshold data default value ffh register address bit type description als th upper lsbs 56h 7 : 0 rw als interrupt upper threshold (low byte) als th upper msbs 57h 7 : 0 rw als interrupt upper threshold (high byte) als_th_low ( 58h, 59h ) 7 6 5 4 3 2 1 0 als lower threshold data default value 00h register address bit type description als th lower lsbs 58h 7 : 0 rw als interrupt lower threshold (low byte) als th lower msbs 59h 7 : 0 rw als interrupt lower threshold (high byte) als_sensitivity ( 5ah ) 7 6 5 4 3 2 1 0 als sensitivity data default value 35h register bit type description als sensitivity data 7 : 0 rw als sensitivity adjustment register refer to p27 persistence ( 5bh ) 7 6 5 4 3 2 1 0 als persistence ps led1 persistence default value 11h field bit type description als persistence 7 : 4 rw persistence for als interrupt. ps led1 persistence 3 : 0 rw persistence for ps led1 interrupt. ps_th_l_led ( 5ch, 5dh, 5eh) 7 6 5 4 3 2 1 0 led l threshold default value 00h register address bit type description led1 l threshold 5ch 7 : 0 rw ps l threshold for each led led2 l threshold 5dh 7 : 0 rw led3 l threshold 5eh 7 : 0 rw
technical note 24/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. current consumption bh1771glc can operate als and ps individually. average current consumption is depend on each statuses and measurement duration (set by 45h, 46h register). major elements which dec ide vcc current consumption are like following table. parameter symbol typ. units comment als part?s current iccals 140 a except for als/ps common circuit current. ps part?s current iccps 250 a except for als/ps common circuit current. current flow for 1.4ms (in case of using one led) current flow for 1.8ms (in case of using two leds) current flow for 2.2ms (in case of using three leds) ps current during driving led icc3 6.5 ma als/ps common ciruit current icccmn 60 a 1) current consumption in case of operating only als vcc current consumption can calculate according to following formula. icc(only als) = iccals * ( 100ms / als meas rate ) +icccmn for example in case measurement rate is 500ms, the value is as following. e. g. ) icc(only als) = 140 a (100ms / 500ms) + 60 a = 88 a 2) current consumption in case of operating only ps vcc current consumption can calculate according to following formula. icc(only ps) = iccps * ( 1.4ms / ps meas rate ) +icccmn + icc3 * ( 200 s / ps meas rate* number of leds ) vdd_led current consumption can calculate according to following formula. ivdd_led = (iled1 + iled2 + iled3) * (200 s / ps meas rate) for example in case it drives 50ma for only led1 and measurement rate is 100ms, the value is as following. e. g. ) icc(only ps) = 250 a * ( 1.4ms / 100ms ) + 60 a + 6.5ma * ( 200 s / 100ms * 1 ) = 76.5 a ivdd_led = (50ma + 0 + 0) * (200 s / 100ms) = 100 a for example in case it drive 200ma for led1,2 and 3 and measurement rare is 10ms, the value is as following. e. g. ) icc(only ps) = 250 a * ( 2.2ms / 10ms ) + 60 a + 6.5ma * ( 200 s / 10ms * 3 ) = 505 a ivdd_led = ( 200ma + 200ma + 200ma ) * (200 s / 10ms) = 12ma 3) current consumption in case of operating als and ps at the same time. vcc current consumption can calculate according to following formula. icc( als+ps) = icc(only al s) + icc(only ps) - icccmn for example in case als measurement rate is 500ms and ps measurement rate is 100ms and it drives 50ma for only led1, the value is as following. e.g. ) icc(als+ps) = 88 a + 76.5 a - 60 a = 104.5 a vdd_led current consumption can calculate sa me as the case of operating only ps. 4) i 2 c bus high speed mode bh1771glc support i 2 c bus hs mode. vcc current cons umption increases approximately 80 a during hs- mode.
technical note 25/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 5) in case of waiting trigger at forced mode als/pscommon cucuit current icccmn is flow. current consumption increases approximately 80ua in this term n x (8-bit data + a/a) 6 7 7 8 9 1 2 to 5 6 7 8 9 1 2 to 5 sdah sclh sdah sclh s 8-bit master code 00001xxx t1 6 8 9 2 to 5 1 sr sr p hs-mode if p then f/s mode if sr (dotted lines) then hs mode tfs th 7-bit sla r/w = mcs current source pull-up = rp resistor pull-up a th f/s mode a current consumption increases approximately 80 a in this term
technical note 26/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. als measurement mode explanation measurement mode measurement time resolution h-resolution mode typ. 100ms. 1 lx m-resolution mode typ.16ms. 4 lx we recommend to use h-resolution mode. measurement time ( integration time ) of h-resolution mode is so long that some kind of noise( including in 50hz / 60hz noise ) is rejected. and h-resolution mode is 1 l x resolution so that it is suitable for darkness. regarding als measurement result als measurement result is registered as following format als data lsb ( 4ch ) 7 6 5 4 3 2 1 0 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 als data msb ( 4dh ) 7 6 5 4 3 2 1 0 2 15 2 14 2 13 2 12 2 11 2 10 2 9 2 8 als lux calculation example als data lsb = ? 1001_0000 ? als data msb = ? 1000_0011 ? ( 2 15 + 2 9 + 2 8 + 2 7 + 2 4 ) P 33680 [ lx ] regarding ps measurement result ps measurement result is converted to logarith m 8bit data and is registered as following format ps_data_led1 ( 4fh ), ps_data_led2 ( 50h ), ps_data_led3 ( 51h ) 7 6 5 4 3 2 1 0 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 the data seeing above registers are possible to change the irradiance. approximation formula is seeing in below. irradiance : 10 ^ (ps_data_led * 0.0197) [ w/cm^2] ps irradiance calculation example ps_data_led1 = ? 1000_0101 ? 10 ^ ( (2 7 + 2 2 + 2 0 ) x 0.0197) = 10^(133 x0.0197) P 417 [ w/cm^2 ]
technical note 27/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. als sensitivity adjustment function bh1771glc is possible to change als sensitiv ity. and it is possible to cancel the opt ical window influence ( difference with / without optical window ) by using this function. adjustm ent is done by changing measurement time. for example, when transmission rate of optical window is 50% (measurement result becomes 0.5 times if optical window is set), influence of optical window is ignored by changing s ensor sensitivity from default to 2 times. sensitivity can be adjusted by als_sensitivity(5ah). for exampl e, sensitivity 2 times when the value of the register is 2 times, and the measurement time 2 times, too. the range of adjusting als_sensitivity is below. min. typ. max. adjustable range of als_sensitivity binary 0001_1000 (sensitivity: default * 0.45 ) 0011_0101 default 1111_1110 (sensitivity: default * 4.79 ) decimal 24 (sensitivity: default * 0.45 ) 53 default 254 (sensitivity: default * 4.79 ) it is possible to detect 0.21lx by using this function at h-resolution mode. the below formula is to calculate illuminant per 1 count. illuminant per 1 count ( lx / count ) = 1 * 53 / x 53 : default value of als_sensitivity register (decimal) x : als_sensitivity register value (decimal) illuminant per 1 count is as following within adjustable range of als_sensitivity. als_sensitivity register value i lluminant per 1count(lx / count) 0001_1000 2.21 0011_0101 1.00 1111_1110 0.21 please input the opecode at power down state to change als_ sensitivity register. there is a possibility of malfunction when the opecode to change als_sensitivity register is input while the illuminant measurement is on-going in stand alone mode, if als measurement time exceeds t he value defined als_meas_rate register, als_meas_rate register value is ignored. next measurement is st arted immediately after one measurement completion.
technical note 28/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. recommended land pattern optical window design above the device unit : mm sensing area; (0.55mm x 0.55mm) please design the optical window so that light can cover at least this area. unit : mm 1.4 min. 0.55 min. 0.55 1.4 min. 0.55 min. 0.55 recommended light receiving area;
technical note 29/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. the method of distinguishing 1pin there is the following methods of distinguishing 1pin. distinguishing by pad design of top side. there are 5 pads in the one side of a top side . there is a space between 2 pads and 3 pads. distinguishing by die pattern. distinguishing by pad design of bottom side. a b 2 pads top view 3 pads 1pin bottom view 1pin pad of 1pin cuts the corner. die pattern
technical note 30/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. power on reset function bh1771glc has power on reset function. by operating this func tion, all of registers are reset when the power is supplied. please note followings and design the application. power on time : t1 bh1771glc becomes operational after 2ms since vc c voltage crosses 1.9v from being less than 0.4v. power off time : t2 before the power is supplied, vcc voltage s hould be less than 0.4v at least for 1ms. *?active state? means that bh177 1glc is correctly operational. int terminal is high impedance when vcc is supplied. 0.4v vcc 1.9v active don?t care t1 bh1771glc don?t care t2 active t1
technical note 31/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. cautions on use 1) absolute maximum ratings an excess in the absolute maximum ra tings, such as supply voltage ( vccmax, vsdamax, vsclmax, vintmax, vgndncmax, vledmax ), temperature range of operating conditions ( topr ), etc., c an break down devices, thus making impossible to identify breaking mode such as a short circui t or an open circuit. if any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. 2) gnd voltage make setting of the potential of the gnd terminal and gnd_led terminal so that they will be maintained at the minimum in any operating state. furthermore, check to be sure no termina ls are at a potential lower th an the gnd voltage including an actual electric transient. 3) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of th e ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or t he gnd terminal, the ics can break down. 4) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. 5) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each pr ocess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to tu rn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to turn off t he power supply and then dismount it from the jig. in addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the stor age of the set pcb. 6) input terminals in terms of the construction of ic, parasitic elements are in evitably formed in relation to po tential. the op eration of the parasitic element can cause interference with circuit operation, thus resulting in a malfunct ion and then breakdown of the input terminal. therefore, pay thorough attention not to handle t he input terminals; such as to apply to the input terminals a voltage lower than the gnd respectively, so that any parasitic element will operate. in addition, apply to the input terminals a voltage within the guaranteed val ue of electrical characteristics. 7) thermal design perform thermal design in which there are adequate margins by taking into account the power dissipation ( pd ) in actual states of use. 8) treatment of package dusts or scratch on the photo detector may affect the optical characterist ics. please handle it with care. 9) rush current when power is first supplied to the cmos ic, it is possible that the internal logic may be unstable and rush current may flow instantaneously. therefore, give special consideration to power coupling capacitance, power wiring, width of gnd wiring, and routing of connections.
technical note 32/32 bh1771glc www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ordering part number b h 1 7 7 1 g l c - e 2 part no. part no. package glc: wlga010v28 packaging and forming specification e2:embossed tape and reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs e2 () direction of feed reel 1pin (unit : mm) wlga010v28 2.65 0.1(mold) 8 0.08 s 2.8 0.1 2.65 0.1(mold) 2.8 0.1 0.9 0.1 1 46 9 top view s bottom view 2.8 0.1 1 4 9 6 2.8 0.1 0.35 0.35 0.7 0.7 0.7 0.4 0.4 1.0 1.0 0.4 0.4 2.0 0.4 0.4 0.5 0.5 0.2 0.2
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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