BH1710FVC_10 Datasheet, PDF (6/17 Pages) Rohm – Digital 16bit Serial Output Type Ambient Light Sensor IC

BH1710FVC
Technical Note
●Explanation of Asynchronous reset and Reset command "0000_0111"
1) Asynchronous reset
All registers are reset. It is necessary on power supply sequence. Please refer "Timing chart for VCC and DVI power
supply sequence" in this page. It is power down mode during DVI = 'L'.
2) Reset command
Reset command is for only reset Illuminance data register. (reset value is '0') It is not necessary even power supply
sequence. It is used for removing previous measurement result. This command is not working in power down mode, so
that please set the power on mode before input this command.
●Timing chart for V_CC and DVI power supply sequence
DVI is I²C bus reference voltage terminal. And it is also asynchronous reset terminal. It is necessary to set to 'L' after VCC
is supplied. In DVI 'L' term, internal state is set to Power Down mode.
1) Recommended Timing chart1 for VCC and DVI supply.
VCC
DVI
Reset Term ( more than 1µs )
2) Timing chart2 for VCC and DVI supply.
(If DVI rises within 1µs after VCC supply)
VCC
DVI
Reset Term (more than 1µs)
Don't care state
ADDR, SDA, SCL is not stable if DVI 'L' term (1µs) is not given by systems.
In this case, please connect the resisters (approximately 100kOhm) to ADDR without directly
connecting to VCC or GND,
because it is 3 state buffer for Internal testing.
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2010.06 - Rev.B