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BH1721FVC
● Block Diagram
VCC
DVI
Technical Note
I C Interface
AMP
ADC
2
Logic
+
SCL
SDA
? Logic + I C Interface
PD
OSC
GND
● 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 "01_0010_1100".
? OSC
Internal Oscillator. It is CLK for internal logic.
● Measurement Procedure
Power supply
Initial state is Power Down mode after
VCC and DVI supply.
Power Down
Power On
Measurement command
State Transition by I 2 C write-command.
Automatically State Transition
Continuous measurement
* "Power On" Command is possible to omit.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
4/15
2011.11 - Rev.B
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