BH1772GLC

Ambient Light Sensor ICs 1 Chip Optical Proximity Sensor + Ambient Light Sensor IC BH1772GLC No.11046EBT12 ●Descriptions BH1772GLC 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 reflection of infrared LED(IrLED) light. Ambient light sensor part can 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 2 1) Correspond to I 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) 2 7) Detection range of proximity sensor is around 10 - 100mm (configurable by I C bus) 8) Built in ambient light cancelation (Proximity sensor function) 9) Built in configurable IrLED current driver ●Applications Mobile phone, DSC, Portable game, Camcoder, Car navigation, PDA, LCD display etc. ●Absolute Maximum Ratings Parameter VCC, Supply Voltage ( Ta = 25℃ ) Symbol Vccmax VSDAmax, VSCLmax, VGNDNCmax VLEDCmax, VINTmax Topr Tstg Imax Pd Ratings 4.5 4.5 7 -40～85 -40～100 7 250※ Units V V V ℃ ℃ mA mW SDA,SCL,GNDNC Terminal Voltage LEDC,INT Terminal Voltage Operating Temperature Storage Temperature SDA, INT Sink Current Power Dissipation ※ 70mm × 70mm × 1.6mm glass epoxy board. Decreasing rate is 3.33mW/℃ for operating above Ta=25℃ ●Operating Conditions Parameter VCC Voltage LEDC Terminal Voltage Symbol Vcc Vledc Ratings Min. 2.3 0.7 Typ. 2.5 2.5 Max. 3.6 5.5 Units V V www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/30 2011.06 - Rev.B BH1772GLC ●Electrical characteristics ( Vcc = 2.5V, Ta = 25℃, unless otherwise noted. ) Limits Parameter Symbol Min. Typ. Max. Units Technical note Conditions Ev = 100 lx ※1 Average current when ALS_CONTROL register(40h) = ” 03h ” and the other registers are default. Average current when PS_CONTROL register(41h) = ” 03h ” and the other registers are default. Supply current for ALS Icc1 － 90 180 μA Supply current for PS Icc2 － 90 180 μA Supply current for PS during driving LED current Standby mode current ALS measurement time ALS measurement accuracy ALS dark ( 0 lx ) sensor out PS sensor out (No proximity object) PS sensor out ( Irradiance by proximity object = 324uW/cm2) ILED pulse duration PS measurement time LEDC terminal sink current at LEDC terminal voltage = 1.3V INT output ‘L’ Voltage SCL SDA input 'H' Voltage SCL SDA input 'L' Voltage SCL SDA input 'H'/’L’ Current I2C SDA output 'L' Voltage ※1 Icc3 Icc4 tMALS S/A ALS0 PS0 PS324u twILED tMPS ILEDC VINT VIH VIL IIHL VOL － － － 0.85 0 0 120 － － 18 0 1.26 － -10 0 6.5 0.8 100 1.0 0 0 128 200 10 20 － － － － － 8.5 1.5 125 1.15 2 30 136 250 12.5 22 0.4 － 0.54 10 0.4 mA μA ms Times count count count μs ms mA V V V μA V IOL = 3mA ILED register(42h) [2:0] = ” 010 ” IINT = 3mA ALS & PS standby No Input Light f/s mode H-Resolution mode Sensor out / Actual lx, Ev = 1000 lx ※1 H-Resolution mode Ambient irradiance = 2 0μW/cm Ambient irradiance = 0μW/cm2 White LED is used as optical source www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/30 2011.06 - Rev.B BH1772GLC ●I2C bus timing characteristics ( Vcc = 2.5V, Ta = 25℃, unless otherwise noted. ) Technical note Limits Parameter Symbol Min. I2C SCL Clock Frequency I2C SCL Clock Frequency2 I2C Hold Time ( Repeated ) START Condition I2C Hold Time ( Repeated ) START Condition2 I2C 'L' Period of the SCL Clock I2C 'L' Period of the SCL Clock2 I2C 'H' Period of the SCL Clock I2C 'H' Period of the SCL Clock2 I2C Set up time for a Repeated START Condition I2C Set up time for a Repeated START Condition2 I2C Data Hold Time I2C Data Hold Time2 I2C Data Setup Time I2C Data Setup Time2 I2C Set up Time for STOP Condition I2C Set up Time for STOP Condition2 I2C Bus Free Time between a STOP and START Condition I2C Data Valid Time I2C Data Valid Acknowledge Time fSCL fSCLH tHD;STA tHD;STA tLOW tLOW tHIGH tHIGH tSU;STA tSU;STA tHD;DAT tHD;DAT tSU;DAT tSU;DAT tSU;STO tSU;STO tBUF tVD;DAT tVD;ACK 0 0 0.6 160 1.3 160 0.6 60 0.6 160 0 0 100 10 0.6 160 1.3 － － Typ. － － － － － － － － － － － － － － － － － － － Max. 400 3.4 － － － － － － － － － 70 － － － － － 0.9 0.9 kHz MHz μs ns μs ns μs ns μs ns μs ns ns ns μs ns μs μs μs f/s mode f/s mode f/s mode Hs mode Cb=100pF f/s mode Hs mode f/s mode Hs mode f/s mode Hs mode f/s mode Hs mode f/s mode Hs mode Cb=100pF f/s mode Hs mode f/s mode Hs mode Units Conditions www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/30 2011.06 - Rev.B BH1772GLC ●Package outlines Technical note A C Production code Lot No. WLGA010V28 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/30 2011.06 - Rev.B BH1772GLC ●Reference Data 1.2 Technical note 64 56 100000 1.0 10000 0.8 Measurement Result 48 40 32 24 16 8 0 Measurement Result 1000 Ratio 0.6 100 0.4 10 0.2 0.0 400 500 600 700 800 900 1000 1100 1 0 8 16 24 32 40 48 56 64 1 10 100 1000 10000 100000 Wavelength [ nm ] Illuminance [ lx ] Illuminance [ lx ] Fig.1 ALS Spectral Response Fig.2 Illuminance ALS Measurement Result Fig.3 Illuminance ALS Measurement Result 2 1.2 1 1pin 0.8 Ratio + 1.2 10 1 8 Measurement Result - 0.8 蛍光灯白熱灯感度比 6 0.6 0.4 + Ratio - 0.6 0.4 + 1pin 4 0.2 0 -90 -60 -30 0 30 60 90 0.2 0 Angle [ deg ] -90 -60 -30 0 + 2 0 30 60 90 -40 -20 0 20 40 60 80 100 Angle [ deg ] Ta [ ℃ ] Fig.4 ALS Directional Characteristics 1 1.2 Fig.5 ALS Directional Characteristics 2 Fluorescent Light Incandescent Light Fig.6 ALS Dark Response 200 ICC @ Measurement [ uA ] 1 0.8 Halogen Light 150 Ratio 0.6 Kripton Light 100 0.4 0.2 0 -40 -20 0 20 40 60 80 100 Artifical Sun Light 50 White LED 0 0 0.5 1 Ratio 1.5 2 2 2.5 3 VCC [ V ] 3.5 4 Ta [ ℃ ] Fig.7 ALS Measurement Accuracy Temperature Dependency 1.2 Fig.8 ALS Light Source Dependency ( Fluorescent Light is set to '1' ) 1.20 Fig.9 VCC - ICC ( During ALS measurement ) 1.2 1 1pin 1 1.00 0.8 0.80 Ratio 0.8 - + Ratio 0.6 Ratio 0.60 0.6 0.4 0.2 0 + 0.4 0.40 0.2 0.20 0 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 VCC [ V ] 0.00 400 500 600 700 800 900 1000 1100 -90 -60 -30 0 30 60 90 Wavelength [nm] Angle [ deg ] Fig.10 ALS Measurement Result VCC Dependency Fig.11 PS Spectral Response Fig.12 PS Directional Characteristics 1 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/30 2011.06 - Rev.B BH1772GLC 1.2 1 0.8 PS_DATAOUT 260 240 Technical note 200 200 180 160 140 120 100 80 60 ICC @ Measurement [ uA ] 0.01 0.1 1 10 100 1000 220 150 Ratio 0.6 - - 1pin 100 0.4 + 50 0.2 0 -90 -60 -30 0 + 40 20 0 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 VCC [ V ] 30 60 90 0 0.001 Angle [ deg ] Irradiance(mW/cm2] Fig.13 PS Directional Characteristics 2 240 Fig.14 Irradiance – PS_DATAOUT 10 Fig.15 VCC - ICC ( During PS measurement ) 24 20 16 ILEDC[mA] 200 160 ILEDC[mA] ICC @ POWER DOWN [ uA ] 0 1 2 3 VLEDC [V] 120 12 8 4 0 1 80 40 0 0 1 2 3 VLEDC [V] 4 5 6 0.1 4 5 6 -40 -20 0 20 40 60 80 100 Ta [ ℃ ] Fig.16 VLEDC – ILEDC@ ILED is set 200mA by ILED register 150 Fig.17 VLEDC – ILEDC@ ILED is set 20mA by ILED register 90％ White paper 200 PS_DATAOUT [count] 160 120 80 40 18％ Kodak GrayCard 0 0 50 100 Object Distance [mm] 150 Human hand ILED=200mA LED : SIM-030ST Center to Center : 10mm between BH1772GLC and SIM-030ST Fig.18 VCC – ICC@0 Lx ( POWER DOWN ) ILED=200mA 160 PS_DATAOUT [count] 120 80 40 0 0 ILED=100mA LED : SIM-030ST Reflector : 18%Kodak Graycard Center to Center : 10mm between BH1772GLC and SIM-030ST PS_DATAOUT [count] 140 130 120 110 ILED=50mA 50 100 150 Object Distance [mm] 100 -40 -20 0 20 40 60 80 100 Ta [℃] Fig.19 PS sensor out Fig.20 Object Distance – PS_DATAOUT Temperature Dependency of different reflector 2 (Irradiance by Proximity object = 324μW/cm ) 160 PS_DATAOUT [count] 120 80 Fig.21 Object Distance – PS_DATAOUT of different ILED SIM-040ST PS_DATAOUT [count] ILED=200mA Reflector : 18%Kodak Graycard Center to Center : 10mm between BH1772GLC and Infrared LED 200 160 120 80 40 0 A=5mm A=10mm A=20mm A=30mm ILED=200mA LED : SIM-030ST Reflector : 18%Kodak Graycard Center to Center : A between BH1772GLC and Infrared LED SIM-030ST 40 0 0 50 100 Object Distance [mm] 150 A=50mm A=70mm 0 50 100 150 Object Distance [mm] Fig.22 Object Distance – PS_DATAOUT of different Infrared LED Fig.23 Object Distance – PS_DATAOUT of different distance between BH1772GLC and SIM-030ST www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/30 2011.06 - Rev.B BH1772GLC ●I2C 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 Technical note ACK SP 2. Case of "write to data register after indicating register address" ST Slave Address 0111000 W 0 ACK Indicate register address 010XXXXX Data specified at register address field + N ACK Data specified at register address field ACK ・・・・・・ ACK ACK SP BH1772GLC continues to write data with address increments until master issues stop condition. Write cycle is 40h - 41h - 42h - 43h - 44h - 45h - 46h – 52h ……… 5Dh – 5Eh - 40h ……… Ex ) If register address field is 45h, then BH1772GLC writes data like seeing in below. 45h - 46h -52h ……… 5Dh – 5Eh - 40h………It is continued 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 Slave Address 0111000 W 0 R 1 ACK Indicate register address 010XXXXX Data specified at register address field Data specified at register address field + N ACK ST ACK ACK Data specified at register address field + 1 2. ST ACK ・・・・・・ ACK NACK SP Case of read data after selecting register address Slave Address 0111000 R 1 ACK Data specified at register address field Data specified at register address field + N ACK Data specified at register address field + 1 ACK ・・・・・・ ACK NACK SP BH1772GLC outputs data from specified address field until master issues stop condition. Read cycle is 40h - 41h - 42h - 43h - 44h - 45h - 46h – 4Ah ……… 5Dh – 5Eh - 40h ……… Ex ) If register address field is 4Ch, then BH1772GLC outputs data like seeing in below. 4Ch - 4Dh -4Eh ……… 5Dh – 5Eh - 40h………It is continued until master issues stop condition. from master to slave from slave to master BH1772GLC operates as I2C bus slave device. Please refer formality I2C bus specification of NXP semiconductors ※ ※ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/30 2011.06 - Rev.B BH1772GLC ●Block diagram and block explanation VDD LED IrLED VCC LEDC IrLED Driver Technical note Proximity Sensor LED Pulse Gen. PS Control Logic Linear / Log converter Data INT interface INT DC light rejection Amp Registers Linear ADC Reflector GND_LED PD_PS Timing Controller OSC POR Ambient Light 16bit ADC PD_ALS ALS Control Logic I 2C Interface SDA SCL Ambient Light Sensor  I2C Interface GND GNDNC I2C bus interface. f/s mode and Hs mode is supported. 1.8V logic interface 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 13 - 14  DATA registers Register for strage of measurement results or commands. Details are on Page 15.  PS control logic This block controls proximity sensor analog block  LED Pulse Gen LED current generator. LED current value is configurable by ILED( 42h ) register.  IrLED Driver IrLED driver block.  PD_ALS Photo diode for ambient light sensor. Peak 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 2 2 AD converter for proximity sensor. Detection range is very wide ( 1μW/cm - 100mW/cm ).  Linear/Log converter Linear to logarithm converter for proximity sensor. Output data is 8bit. PS irradiance calculation example is on Page 24. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/30 2011.06 - Rev.B BH1772GLC ●Example of application circuit diagram If you do not use the INT pin, please connect to GND or opening (non connect). Regarding NC1 and NC2, please connect to VDD_LED or open (non connect). 1) Standard application circuit example VDD_LED 2.5 - 5.5V 2.3 – 3.6V (ex. 0.1μF) (ex. 10μF) 6 LEDC 3 NC1 NC2 2 1 DC light rejection Amp PD_PS Timing Controller OSC SCL ALS Control Logic I 2C Interface 8 SDA 9 IrLED Driver VCC Technical note (ex. SIM-030ST(Rohm)) IrLED 1.65 – 5.5V Proximity Sensor LED Pulse Gen PS Control Logic Linear / Log converter Data INT interface 5 INT Registers Linear ADC 1.65 - 3.6V POR Micro Controller or Baseband Processor 16bit ADC PD_ALS Ambient Light Sensor 4 7 GND GNDNC 10 GND_LED 2) In case of extending proximity sensor detection distance BH1772GLC can drive maximum 200mA(Typ) current. By adding simple external circuit, it is possible to increase IrLED current and to extend detection distance. In case of driving large current for IrLED, note that the current value must not be over the absolute maximum rating for IrLED. VDD_LED 4.5 - 5.5V 2.3 – 3.6V 1kOhm (ex. 10μF) PMOS （ex. RTR030P02 (Rohm)） 6 LEDC 3 NC1 NC2 2 1 DC light rejection Amp PD_PS Timing Controller OSC SCL ALS Control Logic I 2C Interface 8 SDA 9 IrLED Driver (ex. 0.1μF) VCC 1.65 – 5.5 V Proximity Sensor LED Pulse Gen PS Control Logic Linear / Log converter Data INT interface 5 INT Registers IrLED (ex. SIM-030ST (Rohm)) R1 Linear ADC 1.65 - 3.6V POR Micro Controller or Baseband Processor 16bit ADC PD_ALS Ambient Light Sensor 4 7 GND GNDNC 10 GND_LED * In the case of the following setting for above circuit, LED current is proximity 500mA. VDD_LED=5V, R1=3.9Ohm www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/30 2011.06 - Rev.B BH1772GLC ●Terminal description PIN No. Technical note Terminal Name Equivalent Circuit Function Terminal for internal test. Non connect or pull up to VDD_LED ( external IrLED anode terminal ) 1 NC1 2 NC2 Terminal for internal test. Non connect or pull up to VDD_LED ( external IrLED anode terminal ) 3 LEDC Nch open drain LED current output terminal. LED current and emitting interval is defined by internal register. Register value is possible to configure by I2C bus. GND terminal for LED driver 4 GND_LED Nch open drain output. Interrupt setting is defined by internal register. Register value is possible to 2 configure by I C bus. 5 INT 6 7 VCC GND Power supply terminal GND terminal 2 I C bus Interface SCL terminal 8 SCL 2 I C bus Interface SDA terminal 9 SDA VCC 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). www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/30 2011.06 - Rev.B BH1772GLC ●Proximity sensor measurement sequence Technical note The below figure shows proximity sensor measurement sequence. First PS measurement is triggered by I2C bus master writes measurement command to PS_CONTROL register ( 41h ). 1. Forced mode PS measurement is done only 1time and PS trigger bit ( 44h ) 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 until master select the other mode. Measurement interval is defined at PS_MEAS_RATE register ( 45h ). LED LED start measurement start measurement PS meas rate tMPS twILED twILED : tMPS : LED current pulse duration, please refer P2 ( Electrical Characteristics ). 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 I C bus master writing measurement command to ALS_CONTROL register ( 40h ). 1. Forced mode ALS measurement is done only 1time and ALS trigger bit( 44h ) 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 select the other mode. Measurement interval is defined at ALS_MEAS_RATE register ( 46h ). If ALS rate disable bit ( 46h ) is ‘H’, there is no interval between measurement. start measurement start measurement ALS meas rate tMALS tMALS : Ambient light sensor measurement time, please refer P2 ( Electrical 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 term until overwriting ALS trigger bit to ‘H’. 2 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/30 2011.06 - Rev.B BH1772GLC ●Interrupt function Technical note Interrupt function compares ALS or PS measurement result to preset interrupt threshold level. PS uses one threshold level or two threshold level ( in hysteresis mode ) and ALS uses two threshold level (upper and lower ). Interrupt status is monitored by INT pin or ALS_PS_STATUS register ( 4Eh ) and Interrupt function is able to be controlled by INTERRUPT register ( 52h ). Interrupt threshold is defined at ALS_TH_UP and ALS_TH_LOW and PS_TH_H and PS_TH_L registers ( 53h, 56 - 59h, 5Ch ). PS_TH_L registers is effective when PS hysteresis bit ( 52h ) 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 function ( 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)=’0’ and PS_CONTROL(41h) = ‘0’.) INT terminal keeps just previous state which power down command is sent. So to set INT terminal to high impedance is recommended. VCC current(approximately 25μA at VCC=2.5V) is consumed during INT terminal is ‘L’. There are two method to set INT terminal to high impedance. 1) Send software reset command. (Write ‘H’ to ALS_CONTROL(40h). Software reset is also worked during power down. All registers are initialized by software reset command.) 2) Write “000” to INTERRUPT register(52h). ex1) In case of using only PS ‘H’ threshold ( INTERRUPT register 52h : ‘0’ ) In case of unlatch mode if the measurement value exceeds the PS interrupt threshold ‘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 interrupt is active, it keeps active status until the measurement value is below threshold ‘H’ value continuously or until end of measurement after INTERRUPT register is read. Master reads INTERRUPT register Latch mode Unlatch mode Unlatch mode persistence = 2 active inactive PS interrupt threshold ‘H’ level Sequential measurement result time www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/30 2011.06 - Rev.B BH1772GLC Technical note ex2 ) In case of using PS ‘H/L’ threshold ( INTERRUPT register 52h : ‘1’ ) In case of unlatch mode if the measurement value exceeds the PS interrupt threshold ‘H’ value, the interrupt becomes active. And if the measurement value goes below the threshold ‘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 interrupt is active, it keeps active status until the measurement value is below threshold ‘L’ value continuously or until end of measurement after INTERRUPT register is read. Master reads INTERRUPT register Latch mode Unlatch mode Unlatch mode persistence = 2 active inactive PS interrupt threshold ‘H’ level PS interrupt threshold ‘L’ level Sequential measurement result time www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/30 2011.06 - Rev.B BH1772GLC Technical note 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 measurement value is continuously out of the range set by threshold ‘H’ and ‘L’ value. If the interrupt is active, it keeps active status until the measurement value is continuously within the range set by threshold ‘H’ and ‘L’ value or until end of measurement after INTERRUPT register is read. Master reads INTERRUPT register Latch mode Unlatch mode Unlatch mode persistence = 2 active inactive ALS interrupt threshold ‘H’ level ALS interrupt threshold ‘L’ level SSequentialmeasurement result equential measurement result time www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/30 2011.06 - Rev.B BH1772GLC ●Command set Address 40h 41h 42h 43h 44h 45h 46h 4Ah 4Bh 4Ch 4Dh 4Eh 4Fh 50h 51h 52h 53h 54h 55h 56h 57h 58h 59h 5Ah 5Bh 5Ch 5Dh 5Eh Type RW RW RW RW RW RW RW R R R R R R R R RW RW RW RW RW RW RW RW RW RW RW RW RW Register name ALS_CONTROL PS_CONTROL I_LED Reserved register 1 ALS_PS_MEAS PS_MEAS_RATE ALS_MEAS_RATE Reserved register 2 Reserved register 3 ALS_DATA_0 ALS_DATA_1 ALS_PS_STATUS PS_DATA Reserved register 4 Reserved register 5 INTERRUPT PS_TH_H Reserved register 6 Reserved register 7 ALS_TH_UP_0 ALS_TH_UP_1 ALS_TH_LOW_0 ALS_TH_LOW_1 ALS_SENSITIVITY PERSISTENCE PS_TH_L Reserved register 8 Reserved register 9 Technical note Register function ALS operation mode control and SW reset PS operation mode control LED current setting Forced mode trigger PS measurement rate ALS measurement rate ALS data (Low Byte) ALS data (High Byte) Measurement data and interrupt status PS data Interrupt setting PS interrupt H threshold ALS upper threshold low byte ALS upper threshold high byte ALS lower threshold low byte ALS lower threshold high byte ALS sensitivity setting INT pin INTERRUPT persistence setting PS interrupt L threshold - www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/30 2011.06 - Rev.B BH1772GLC ○ ALS_CONTROL ( 40h ) 7 RES Technical note 6 RES 5 RES 4 RES 3 ALS Resolution 2 SW Reset 1 0 ALS mode default value 00h Field RES ALS Resolution SW reset Bit 7:4 3 2 Type RW RW RW Description Write “0000” 0 : H-Resolution mode, 1 lx step output 1 : M-Resolution mode, 4 lx step output 0 : initial reset is not started 1 : initial reset is started 00 : Standby mode 01 : Don’t use. 10 : Forced mode 11 : Stand alone mode 3 X 2 X 1 0 PS mode default value 00h ALS mode ○ PS_CONTROL ( 41h ) 7 X 1:0 RW 6 X 5 X 4 X Field NA Bit 7:2 Type - Description Ignored 00 : Standby mode 01 : Don’t use. 10 : Forced mode 11 : Stand alone mode PS mode 1:0 RW ○ I_LED ( 42h ) 7 6 5 4 3 2 1 0 default value 1Bh Field Reserved Bit 7:3 Type RW Description write “00011” 000 : 5mA 001 : 10mA 010 : 20mA 011 : 50mA 100 : 100mA 101 : 150mA 11X : 200mA Reserved LED current LED current 2:0 RW ○ Reserved register 1 ( 43h ) 7 6 X X 5 X 4 X 3 X 2 Reserved 1 0 default value 03h Field NA Reserved Bit 7:3 2:0 Type RW Description Ignored 000 : 5mA www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/30 2011.06 - Rev.B BH1772GLC ○ ALS_PS_MEAS ( 44h ) 7 X Technical note 6 X 5 X 4 X 3 X 2 X 1 0 ALS PS trigger trigger default value 00h Field NA ALS trigger PS trigger *2 Bit 7:2 1 0 Type RW RW Description Ignored 0 : Ignored *2 1 : Start ALS measurement at force mode 0 : Ignored 1 : Start PS measurement at force mode *2 Even if trigger is set during measurement, the measurement doesn’t restart. The measurement will start, in case that It is set to forced mode by ALS_CONTROL register (40h) or PS_CONTROL register (41h) and is not during measurement. ○ PS_MEAS_RATE ( 45h ) 7 6 X X 5 X 4 X 3 2 1 0 default value 05h PS meas rate Field NA Bit 7:4 Type - Description Ignored 0000 : 10ms 0001 : 20ms 0010 : 30ms 0011 : 50ms 0100 : 70ms 0101 : 100ms 0110 : 200ms 0111 : 500ms 1000 : 1000ms 1001 : 2000ms 101X : 2000ms 11XX : 2000ms PS meas rate 3:0 RW ○ ALS_MEAS_RATE ( 46h ) 7 6 ALS rate X disable 5 X 4 X 3 X 2 1 0 ALS meas rate default value 02h Field ALS rate disable NA Bit 7 6:3 Type RW - Description 0 : ALS meas rate( 46h ) is active 1 : ALS meas rate( 46h ) is inactive Ignored 000 : 100ms 001 : 200ms 010 : 500ms 011 : 1000ms 1XX : 2000ms ALS meas rate 2:0 RW www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/30 2011.06 - Rev.B BH1772GLC ○ Reserved register 2 ( 4Ah ) 7 6 X X Technical note 5 X 4 X 3 X 2 X 1 X 0 X default value 93h Field NA ○ Reserved register 3 ( 4Bh ) 7 6 X X Bit 7:0 Type R Description Reserved 5 X 4 X 3 X 2 X 1 X 0 X default value 01h Field NA ○ ALS_DATA ( 4Ch, 4Dh ) 7 6 ALS data Bit 7:0 Type R Description Reserved 5 4 3 2 1 0 default value 00h Register ALS data LSBs ALS data MSBs ○ ALS_PS_STATUS ( 4Eh ) 7 6 ALS ALS INT data status status Address 4Ch 4Dh Bit 7:0 7:0 Type R R Description ALS data Low byte ALS data High byte 5 4 3 2 Reserved 1 0 PS PS INT data status status default value 00h Field ALS INT status ALS data status Reserved PS INT status PS data status Bit 7 6 5:2 1 0 Type R R R R R Description 0 : ALS interrupt signal inactive 1 : ALS interrupt signal active 0 : ALS old data (data is already read) 1 : ALS new data (data is renewed after previous reading) 0 : PS interrupt signal inactive 1 : PS interrupt signal active 0 : PS old data (data is already read) 1 : PS new data (data is renewed after previous reading) ALS interrupt signal inactive means that ALS measurement result is within threshold level set by ALS_TH register(56h, 57h, 58h, 59h). ALS interrupt signal active means measurement result is out of threshold level set by ALS_TH register. PS interrupt signal active means PS measurement result exceeds threshold level defined by PS_TH_H register(53h). PS interrupt signal inactive means PS measurement result does not exceed threshold level set by PS_TH_H register. When PS interrupt hysteresis( INTERRUPT register 52h) is ‘H’, if once interrupt signal becomes active, it is kept until measurement result becomes less than PS_TH_L(5Ch) register value. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/30 2011.06 - Rev.B BH1772GLC ○ PS_DATA ( 4Fh ) 7 PS data default value 00h Register PS data ○ Reserved register 4 ( 50h ) 7 6 X X Bit 7:0 Type R Description PS measurement data Technical note 6 5 4 3 2 1 0 5 X 4 X 3 X 2 X 1 X 0 X default value 00h Field Reserved ○ Reserved register 5 ( 51h ) 7 6 X X Bit 7:0 Type R Description Reserved 5 X 4 X 3 X 2 X 1 X 0 X default value 00h Field Reserved Bit 7:0 Type R Description Reserved ○ INTERRUPT ( 52h ) 7 X 6 X 5 Interru pt source 4 PS Interrupt hysteresis 3 Output mode 2 Interrupt polarity 1 0 Interrupt mode default value 08h Field NA Interrupt source PS Interrupt hysteresis Output mode Interrupt polarity Bit 7:6 5 4 3 2 Type R RW RW RW Description Ignored 0 : First interrupt triggered by ALS 1 : First interrupt triggered by PS 0 : Use PS_TH_H only. 1 : Use PS_TH_H and PS_TH_L for hysteresis 0 : INT pin is latched until INTERRUPT register is read. 1 : INT pin is updated after each measurement. 0 : INT pin is logic ‘L’ when interrupt signal is active 1 : INT pin is logic ‘L’ when interrupt signal is inactive 00 : INT pin is inactive. 01 : Triggered by only PS measurement 10 : Triggered by only ALS measurement 11 : Triggered by PS and ALS measurement Interrupt mode 1:0 RW www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/30 2011.06 - Rev.B BH1772GLC ○ PS_TH_H ( 53h ) 7 6 PS H threshold 5 4 3 2 1 0 default value FFh Register PS_TH_H ○ Reserved register 6 ( 54h ) 7 6 Reserved 5 4 3 2 1 0 default value FFh Field Reserved ○ Reserved register 7 ( 55h ) 7 6 Reserved 5 4 3 2 1 0 default value FFh Field Reserved Bit 7:0 Type RW Description write “11111111” Bit 7:0 Type RW Description write “11111111” Bit 7:0 Type RW Description PS Interrupt H threshold level Technical note ○ ALS_TH_UP ( 56h, 57h ) 7 6 5 ALS upper threshold data 4 3 2 1 0 default value FFh Register ALS TH upper LSBs ALS TH upper MSBs Address 56h 57h Bit 7:0 7:0 Type RW RW Description ALS interrupt upper threshold (Low byte) ALS interrupt upper threshold (High byte) ○ ALS_TH_LOW ( 58h, 59h ) 7 6 5 ALS lower threshold data 4 3 2 1 0 default value 00h Register ALS TH lower LSBs ALS TH lower MSBs Address 58h 59h Bit 7:0 7:0 Type RW RW Description ALS interrupt lower threshold (Low byte) ALS interrupt lower threshold (High byte) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/30 2011.06 - Rev.B BH1772GLC ○ ALS_SENSITIVITY ( 5Ah ) 7 6 Technical note 5 4 3 2 1 0 default value 35h ALS sensitivity data Register ALS sensitivity data ○ PERSISTENCE ( 5Bh ) 7 6 ALS persistence Bit 7:0 Type RW Description ALS sensitivity adjustment register（refer to P25） 5 4 3 2 PS persistence 1 0 default value 11h Field ALS persistence PS persistence ○ PS_TH_L ( 5Ch ) 7 6 PS L threshold Bit 7:4 3:0 Type RW RW Description Persistence for ALS interrupt. Persistence for PS interrupt. 5 4 3 2 1 0 default value 00h Register PS_TH_L Bit 7:0 Type RW Description PS Interrupt L threshold level ○ Reserved register 8 ( 5Dh ) 7 6 5 4 3 2 1 0 default value 00h Field Reserved ○ Reserved register 9 ( 5Eh ) 7 6 5 4 3 2 1 0 default value 00h Field Reserved Bit 7:0 Type RW Description write “00000000” Bit 7:0 Type RW Description write “00000000” Reserved Reserved www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/30 2011.06 - Rev.B BH1772GLC ●Current consumption Technical note BH1772GLC 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 decide VCC current consumption are like following table. Parameter Symbol Typ. Units Comment ALS part’s current IccALS 140 μA Except for ALS/PS common circuit current. PS part’s current IccPS 250 μA Except for ALS/PS common circuit current. Current flow for 1.4ms PS current during driving LED ALS/PS common ciruit current Icc3 Icccmn 6.5 60 mA μA 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(onlyALS) = 140μA (100ms / 500ms) + 60μA = 88μA 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 * ( 200μs / PS meas rate ) VDD_LED current consumption can calculate according to following formula. IVDD_LED = 200μs / PS meas rate For example in case it drives 50mA and measurement rate is 100ms, the value is as following. e. g. ) ICC(onlyPS) = 250μA * ( 1.4ms / 100ms ) + 60μA + 6.5mA * ( 200μs / 100ms ) = 76.5μA IVDD_LED = 50mA * (200μs / 100ms) = 100μA 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(onlyALS) + Icc(onlyPS) - Icccmn For example in case ALS measurement rate is 500ms and PS measurement rate is 100ms and it drives 50mA, the value is as following. e.g. ) ICC(ALS+PS) = 88μA + 76.5μA - 60μA = 104.5μA VDD_LED current consumption can calculate same as the case of operating only PS. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/30 2011.06 - Rev.B BH1772GLC 4) Technical note I2C bus High speed mode BH1772GLC support I2C bus Hs mode. VCC current consumption increases approximately 80μA during Hs- mode. 8-bit Master code 00001xxx S SDAH A t1 tH SCLH 1 2 to 5 6 F/S mode 7 8 9 7-bit SLA Sr SDAH R/W A n x (8-bit DATA + A/A) Sr P SCLH 1 2 to 5 6 7 8 9 1 2 to 5 6 7 8 9 tFS Hs-mode If P then F/S mode If Sr (dotted lines) then Hs mode tH = MCS current source pull-up Current consumption increases approximately 80uA in this term 80μA = Rp resistor pull-up 5 ) In case of waiting trigger at forced mode ALS/PScommon cucuit current （Icccmn） is flow. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/30 2011.06 - Rev.B BH1772GLC ●ALS Measurement mode explanation Measurement Mode H-Resolution mode M-Resolution mode Measurement Time typ. 100ms. typ.16ms. Resolution 1 Lx 4 Lx Technical note 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 27 26 5 25 4 24 3 23 2 22 1 21 0 20 ALS DATA MSB ( 4Dh ) 7 6 215 214 ALS Lux calculation example ALS DATA LSB = ” 1001_0000 ” ALS DATA MSB = ” 1000_0011 ” 5 213 4 212 3 211 2 210 1 29 0 28 ( 215 + 29 + 28 + 27 + 24 ) ≒ 33680 [ lx ] ●Regarding PS measurement result PS measurement result is converted to logarithm 8bit data and is registered as following format PS_DATA ( 4Fh ) 7 27 6 26 5 25 4 24 3 23 2 22 1 21 0 20 The data seeing above register is possible to change the irradiance. Approximation formula is seeing in below. Irradiance : 10 ^ (PS_DATA * 0.0197) [μW/cm^2] PS irradiance calculation example PS_DATA = ” 1000_0101 ” 10 ^ ( (27 + 22 + 20 ) x 0.0197) = 10^(133 x0.0197) ≒ 417 [ μW/cm^2 ] www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/30 2011.06 - Rev.B BH1772GLC ●ALS sensitivity adjustment function Technical note BH1772GLC is possible to change ALS sensitivity. And it is possible to cancel the optical window influence ( difference with / without optical window ) by using this function. Adjustment 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 sensor sensitivity from default to 2 times. Sensitivity can be adjusted by ALS_SENSITIVITY(5Ah). For example, 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. 0001_1000 (sensitivity: default * 0.45 ) 24 (sensitivity: default * 0.45 ) Typ. 0011_0101 default 53 default Max. 1111_1110 (sensitivity: default * 4.79 ) 254 (sensitivity: default * 4.79 ) Adjustable range of ALS_SENSITIVITY binary decimal 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 0001_1000 0011_0101 1111_1110 Illuminant per 1count(lx / count) 2.21 1.00 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 the value defined ALS_MEAS_RATE register, ALS_MEAS_RATE register value is ignored. Next measurement is started immediately after one measurement completion. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25/30 2011.06 - Rev.B BH1772GLC ●Recommended land pattern Technical note unit : mm ●Optical window design above the device 1.4 Min. 0.55 Sensing area; (0.55mm x 0.55mm) Min. 0.55 Recommended light receiving area; Please design the optical window so that light can cover at least this area. Min. 0.55 1.4 Min. 0.55 unit : mm www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 26/30 2011.06 - Rev.B BH1772GLC ●The method of distinguishing 1pin There is the following methods of distinguishing 1pin. ① 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. Technical note ② 1Pin 2 pads A ① C 3 pads ②Die pattern Top View ③ Distinguishing by Pad design of bottom side. 1Pin Bottom View Pad of 1pin cuts the corner. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 27/30 2011.06 - Rev.B BH1772GLC ●Power on reset function Technical note BH1772GLC has power on reset function. By operating this function, all of registers are reset when the power is supplied. Please note followings and design the application. ① Power on time : t1 BH1772GLC becomes operational after 2ms since VCC voltage crosses 1.9V from being less than 0.4V. Power off time : t2 Before the power is supplied, VCC voltage should be less than 0.4V at least for 1ms. ② 1.9V VCC 0.4V t1 BH1772GLC Don’t care active Don’t care active t2 t1 *”active state” means that BH1772GLC is correctly operational. INT terminal is high impedance when VCC is supplied. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 28/30 2011.06 - Rev.B BH1772GLC ●Cautions on use Technical note 1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage ( Vccmax, VSDAmax, VSCLmax, VINTmax, VGNDNCmax, VLEDCmax ), temperature range of operating conditions ( Topr ), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit 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 terminals are at a potential lower than 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 the 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 the GND terminal, the ICs can break down. 4) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. 5) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the 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 storage of the set PCB. 6) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the 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 value 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 characteristics. 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 29/30 2011.06 - Rev.B BH1772GLC ● Ordering part number Technical note B H 1 Part No. 7 7 2 G L C - E 2 Part No. Package GLC: WLGA010V28 Packaging and forming specification E2:Embossed tape and reel WLGA010V28 2.8± 0.1 2.65± 0.1(MOLD) 0.9± 0.1 2.65± 0.1(MOLD) 2.8± 0.1 1 Top View 9 Tape Quantity Embossed carrier tape (with dry pack) 3000pcs E2 The direction is the 1pin of product is at the upper left when you hold 4 6 Direction of feed 8 ( reel on the left hand and you pull out the tape on the right hand ) S 0.08 S Bottom View 2.8± 0.1 2.0 0.4 0.4 0.5 0.5 4 6 0.35 0.7 0.7 0.7 0.35 2.8± 0.1 0.4 1 0.2 9 1pin (Unit : mm) Reel 0.4 0.2 Direction of feed 0.4 1.0 1.0 0.4 ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 30/30 2011.06 - Rev.B Notice 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 Products. 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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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A