Ambient Light Sensor ICs
1 chip Optical Proximity Sensor
+ Ambient Light Sensor IC
BH1771GLC
No.11046EAT11
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 reflection of infrared LED (IrLED) light. And this device can drive maximum 3
IrLEDs, and touch-less motion detection function can be implemented. Ambient light 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 visibilities 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) 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 Maximum Ratings (Ta = 25)
Parameter Symbol Ratings Units
VCC, Supply Voltage
Vccmax 4.5 V
VSDAmax,
SDA,SCL,GNDNC Terminal Voltage VSCLmax, 4.5 V
VGNDNCmax
VLEDmax,
LED1,LED2,LED3 INT Terminal Voltage 7 V
VINTmax
Operating Temperature Topr -4085
Storage Temperature Tstg -40100
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
Ratings
Parameter Symbol 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
www.rohm.com
2011.01 - Rev.A
1/31
2011 ROHM Co., Ltd. All rights reserved. BH1771GLC Technical Note
Electrical characteristics (VCC = 2.5V, Ta = 25, unless otherwise noted.)
Limits
Parameter Symbol Units Conditions
Min. Typ. Max.
1
Ev = 100 lx
Average current when
Supply current for ALS Icc1 90 180 A
ALS_CONTROL register(40h) = 03h
and the other registers are default.
Average current when
Supply current for PS PS_CONTROL register(41h) = 03h
Icc2 90 180 A
and the other registers are default.
Supply current for PS
Icc3 6.5 8.5 mA
during driving LED current
ALS & PS standby No Input Light
Standby mode current Icc4 0.8 1.5 A
f/s mode
ALS measurement time tMALS 100 125 ms
1
ALS measurement accuracy S/A 0.85 1.0 1.15 Times Sensor out / Actual lx, Ev = 1000 lx
ALS dark (0 lx) sensor out ALS0 0 0 2 count
PS sensor out
2
Ambient irradiance = 0W/cm
PS0 0 0 30 count
(No proximity object)
PS sensor out (Irradiance by 2
2 PS324u 120 128 136 count Ambient irradiance = 0W/cm
proximity object = 324W/cm )
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
ILED register(42h)[2:0] = 010
ILED1 18 20 22 mA
at LED1 terminal voltage = 1.3V
LED2 terminal sink current
ILED2 18 20 22 mA ILED register(42h) [5:3] = 010
at LED2 terminal voltage = 1.3V
LED3 terminal sink current
ILED3 register(43h)[2:0] = 010
ILED3 18 20 22 mA
at LED3 terminal voltage = 1.3V
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
2
I C SDA output L Voltage VOL 0 0.4 V IOL = 3mA
1 White LED is used as optical source
www.rohm.com
2011.01 - Rev.A
2/31
2011 ROHM Co., Ltd. All rights reserved.