Human Interface Products Copyright © 2010 by Silicon Laboratories 11.19.10
Visible
VDD
SDA
SCL
Regulator
I2C
LED
Drivers
LED1
GND
INT Infrared
Register Map
A
M
U
X
ADC
Temp Filter
Oscillator
Digital Sequencer & Control Logic
LED2
NC
DNC
LED3
Si1143
Proximity/Ambient Light Sensor with I2C Interface
Description
The Si1143 is a low-power, reflectance-based
infrared proximity and ambient light sensor with I2C
digital interface and programmable-threshold
interrupt output. This device includes an integrated
high-sensitivity photodiode, digital converter, digital
signal processor, and three integrated infrared LED
drivers with selectable drive levels. The Si1143 of fers
excellent performance under a wide dynamic range
of light sources including direct sunlight. The
photodiode response and associated digital
conversion circuitry provide excellent immunity to
artificial light flicker noise. The three infrared LED
driver device is capable of supporting advanced
infrared proximity motion detection. The Si1143
supports slave and autonomous modes of operation.
The device is provided in an 10-lead 2x2 mm QFN
package and is capable of operation from 1.8 to
3.6 V over the –40 to +85 °C temperature range.
Applications
-Handsets
-eReaders
-Notebooks/netbooks/tablet PCs
-Portable consumer electronics
-Audio products
-Security panels
-Tamper detection circuits
-Dispensers
-Valve controls
-Smoke detectors
-Touchless switches
-Occupancy sensors
-Consumer electronics
-Industrial automation
-Display backlighting control
-Photo-interrupter
Features
QuickSense™ Integrated Infrared Proximity Detector
-Three independent LED drivers
-Fifteen current settings from 6 mA to 416 mA for each LED
driver
-25.6 µs LED driver pulse width
-500 mm proximity range with single pulse (<2.5 kLx)
-150 mm proximity range with single pulse (>2.5 kLx)
-Operates at up to 128 klux (direct sunlight)
-Minimum reflectance sensitivity
< 1 µW/cm2
-High EMI immunity without shielded packaging
QuickSense™ Integrated Ambient Light Sensor
-10 mlx resolution possible, allowing operation under dark glass
-1 to 128 klx dynamic range possible across two ADC range set-
tings
-17-bit resolution
-Accurate lux measurements possible with IR correction algo-
rithm
-25.6 µs measurement cycle keeps total power consumption
duty cycle low without compromising performance or noise
immunity
Industry's Lowest Power Consump tio n
-1.8 to 3.6 V supply voltage
-9.7 µA average dc current draw
Assuming single PS channel, ALS Visible + ALS IR every
800 ms,
3 µA average current for sensors and internal circuitry, and
6.7 µA average current for external LED (assuming 209 mA for
25.6 µs every 800 ms)
-< 20 nA powered down current
-< 500 nA standby current
-Internal and external wake support
-Built-in voltage supply monitor and power-on reset controller
Serial Communications
-SMBus (I2C compatible) up to 3.4 Mbps data rate
-Slave mode hardware address recognition
Small-outline 10-Lead 2x2 mm QFN Package
Temperature Range: –40 to +85 °C
Human Interface Products Copyright © 2010 by Silicon Laboratories 11.19.10
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
Si1143
Proximity/Ambient Light Sensor with I2C Interface
Selected Electrical Specifications
(TA = –40 to +85 °C unless otherwise specified)
Parameter Conditions Min Typ Max Units
Supply Voltage –40 to +85 °C, VDD to VSS 1.8 3.3 3.6 V
Operating Temperature –40 25 85 °C
PS Operation under
Direct Sunlight (Edc) VDD = 3.3 V — — 128 klx
IDO Standby Mode VDD = 3.3 V — — 500 nA
Min. Detectable
Reflectance Input VDD = 3.3 V — 0.1 1µW/cm2
ALS Dynamic Range 10m —128k lx
ALS Linearity 100–1000 Lux — — ±5 %
10–100 Lux — — ±10 %
3–10 Lux — — ±30 %
Pin Assignments (Preliminary)
LED1
VDD
SCL GND
INT
2
3
4
9
8
7
6
QFN-10
LED2
SDA 1
DNC
10NC 5
LED3
Note: Connect any unused LED drivers to VDD.
10-Pin QFN Package
Symbol Millimeters
Min Typ Max
A 0.55 0.65 0.75
b 0.20 0.25 0.30
D 2.00 BSC
e 0.50 BSC
E 2.00 BSC
L 0.30 0.35 0.40
aaa 0.10
bbb 0.10
ccc 0.08
ddd 0.10
Product Family
Part Number Pkg LED Drivers Range[<2.5 klx] Range[>2.5 klx] Supply Voltage
Si1143-A10-GM QFN-10 3 500 mm 150 mm 1.8–3.6 V
