SI1132 Datasheet, PDF (1/49 Pages) Silicon Laboratories – Integrated ambient light sensor

Si1132
UV INDEX AND AMBIENT LIGHT SENSOR IC WITH I²C INTERFACE
Features
 Integrated UV index sensor
 Industry's lowest power
Digital UV Index register that can ^consumption
be read through I²C interface
1.71 to 3.6 V supply voltage
Factory calibration to address
< 500 nA standby current
part-to-part variation
Internal and external wake support
 Integrated ambient light sensor
Built-in voltage supply monitor and
100 mlx resolution possible,
power-on reset controller
allowing operation under dark  I²C Serial communications
glass
Up to 3.4 Mbps data rate
1 to 128 klx dynamic range
Slave mode hardware address
possible across two ADC range
decoding
settings
 Small-outline 10-lead 2x2 mm
Accurate lux measurements with
QFN
IR correction algorithm
 Temperature Range
–40 to +85 °C
Applications
 Fitness/health electronics
 Smart watches
 Smartphone handsets
Description
 Tablets
 Portable consumer electronics
 Display-backlighting control
The Si1132 is a low-power, ultraviolet (UV) index, and ambient light
sensor with I²C digital interface and programmable-event interrupt output.
This sensor IC includes an analog-to-digital converter, integrated high-
sensitivity visible and infrared photodiodes, and digital signal processor.
The Si1132 offers excellent performance under a wide dynamic range
and a variety of light sources including direct sunlight. The Si1132 can
also work under dark glass covers. The photodiode response and
associated digital conversion circuitry provide excellent immunity to
artificial light flicker noise and natural light flutter noise. The Si1132
devices are provided in a 10-lead 2x2 mm QFN package and are capable
of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range.
Pin Assignments
SDA
SCL
V_DD
INT
DNC
10
1
9
2
8
QFN-10
3
7
4
6
5
DNC
V_DD
GND
V_DD
V_DD
Rev. 1.2 12/14
Copyright © 2014 by Silicon Laboratories
Si1132