ALS-PDIC17-79NB-TR8 Datasheet, PDF (15/21 Pages) Everlight Electronics Co., Ltd – I2 Digital Ambient Light Sensor

Surface - Mount
I²C Digital Ambient Light Sensor
ALS-PDIC17-79NB/TR8
Power Supply Decoupling and Layout
The power supply lines must be decoupled with capacitors, 4.7uF and 0.1uF, placed as close to the
device package as possible. The bypass capacitor should have low effective series resistance (ESR) and
effective series inductance (ESI), such as the common ceramic types, which provide a low impedance path to
ground at high frequencies to handle transient currents caused by internal logic switching. ALS-PDIC17-79NB
is relatively insensitive to layout. Like other I2C devices, it is intended to provide excellent performance even in
significantly noisy environments. There are only a few considerations that will ensure best performance. Route
the supply and I2C traces as far as possible from all sources of noise. Use two power-supply decoupling
capacitors, 4.7µF and 0.1µF, placed close to the device.
Everlight Electronics Co., Ltd.
Document No: DLS-xxxxxxx Rev1
15
http://www.everlight.com
Oct. 12, 2010