BH1730FVC_16 Datasheet, PDF (14/24 Pages) Rohm – Digital 16bit Serial Output Type Ambient Light Sensor IC

BH1730FVC
8. Power On Sequence
ALL registers of BH1730FVC are reset when VCC powers up. There are some notes about power up and down sequence
as shown below.
(1) Power ON Time: t1
More than 2ms is needed to activate BH1730FVC after VCC becomes more than 2.4V from less than 0.4V.
Operating voltage is from 2.4V to 3.6V.
(2) Power OFF time: t2
More than 1ms (VCC < 0.4V) is needed before supplying power to BH1730FVC.
VCC
2.4V
0.4V
t1
BH1730FVC
Undefined Behavior
active
t2
t1
Undefined Behavior
active
Note: ”active state” means that BH1730FVC operates and accept I²C bus access correctly.
9. ALS Sensitivity Adjustment Function
BH1730FVC is capable of changing its ALS sensitivity. This is used to compensate the effect of attenuation by the optical
window. Adjustment is done by changing the integration time. For example, when transmission rate of optical window is
1/n (measurement result becomes 1/n times if optical window is above the sensor), the effect of optical window is
compensated by changing integration time from default to n times.
Take note that at 100,000 lx or higher illuminance cannot be measured even when the sensitivity is decreased.
10. Optical Design for the Device
0.8 mm
0.4mm
0.4mm
1.3 mm
0.4mm 0.4mm
PD area (0.25mm x 0.3 mm)
Please design the optical window so that light can
cover at least this are.
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TSZ22111・15・001
14/20
TSZ02201-0M3M0F616050-1-2
8.Jun.2016 Rev.001