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BH1751FVI
● Block Diagram
VCC
DVI
Technical Note
I C Interface
PD
AMP
ADC
OSC
GND
2
Logic
+
ADDR
POR
SCL
SDA
? Logic + I C Interface
● Block Diagram Descriptions
? PD
Photo diode with approximately human eye response.
? AMP
Integration-OPAMP for converting from PD current to Voltage.
? ADC
AD converter for obtainment Digital 16bit data.
2
Ambient Light Calculation and I 2 C BUS Interface. It is including below register.
Data Register → This is for registration of Ambient Light Data. Initial Value is "0000_0000_0000_0000".
Measurement Time Register → This is for registration of measurement time. Initial Value is "0100_0101".
? OSC
Internal Oscillator ( typ. 320kHz ). It is CLK for internal logic.
? POR
Power on reset. All register is reset after VCC is supplied. Please refer P.8 (Caution of power on reset function).
● Measurement Procedure
Power supply
State is automatically changed to
Power Down mode.
One Time Measurement
Initial state is Power Down mode after
VCC and DVI supply.
Power Down
Power On
Measurement Command
Continuous Measurement
State Transition by I 2 C write-command.
Automatically State Transition
*
"Power On" Command is possible to omit.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
4/16
2011.11 - Rev.B
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