BH1751FVI Datasheet, PDF (8/17 Pages) Rohm – Digital 16bit Serial Output Type Ambient Light Sensor IC

BH1751FVI
●Application circuit example
Technical Note
I²C bus pull up resister
0.1µF
BH1751FVI
VCC
ADDR
GND
SCL
DVI
SDA
2.2kohm 2.2kohm
0.1µF
Micro
Controller
I²C bus voltage source
* I²C BUS is trademark of Phillips Semiconductors. Please refer formality specification for pull up resister.
●Caution of power on reset function
BH1751FVI has power on reset (POR) function. POR is to reset all register and flip flop when VCC Power supplies.
There are some cautions about power on and down sequence seeing in below.
① Power on time : t1
More than 2ms is need to active BH1751FVI after VCC supplies more than 2.0V from VCC is less than 0.4V.
② Power off time : t2
More than 1ms (VCC < 0.4V) is need to active BH1751FVI.
VCC
2.0V
0.4V
t1
BH1751FVI
Don’t care
active
t2
t1
Don’t care
active
*”active state” is that BH1751FVI works and accept I²C bus access correctly.
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8/16
2010.02 - Rev.A