ALS-PDIC17-57B-TR8 Datasheet, PDF (14/19 Pages) Everlight Electronics Co., Ltd – Surface - Mount I2C Digital Ambient Light Sensor

Surface - Mount
I²C Digital Ambient Light Sensor
Power Supply Decoupling and Layout
ALS-PDIC17-57B/TR8
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-PDIC17-57B 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. The pull up resister of
two line serial bus “SCL” and “SDA” are recommended to be around 4.7Kohm,
2.7V ~ 5.5V
Figure 17 Application Circuit
Everlight Electronics Co., Ltd.
Document No: DLS-00000xx Rev0.1
14
http://www.everlight.com
Jun. 22, 2011