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Si1145 Datasheet

PROXIMITY/UV/AMBIENT LIGHT SENSOR IC

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Si1145/46/47
PROXIMITY/UV/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
Features
Integrated infrared proximity detector Integrated UV index sensor
Proximity detection adjustable from Industry's lowest power consumption
under 1 cm to over 50 cm
1.71 to 3.6 V supply voltage
Three independent LED drivers
9 µA average current (LED pulsed
15 current settings from 5.6 mA to
25.6 µs every 800 ms at 180 mA
360 mA for each LED driver
plus 3 µA Si114x supply)
25.6 µs LED driver pulse width
< 500 nA standby current
50 cm proximity range with single
Internal and external wake support
pulse (<3 klx)
Built-in voltage supply monitor and
15 cm proximity range with single
power-on reset controller
pulse (>3 klx)
25.6 µs LED “on” time keeps total
Operates at up to 128 klx (direct
power consumption duty cycle low
sunlight)
without compromising performance
High reflectance sensitivity
or noise immunity
< 1 µW/cm2
I2C Serial communications
High EMI immunity without shielded Up to 3.4 Mbps data rate
packaging
Slave mode hardware address
Integrated ambient light sensor
decoding
100 mlx resolution possible,
Small-outline 10-lead 2x2 mm QFN
allowing operation under dark glassTemperature Range
1 to 128 klx dynamic range possible –40 to +85 °C
across two ADC range settings
Accurate lux measurements with IR
correction algorithm
Applications
Handsets
E-book readers
Notebooks/Netbooks
Portable consumer electronics
Audio products
Security panels
Tamper detection circuits
Dispensers
Description
Valve controls
Smoke detectors
Touchless switches
Touchless sliders
Occupancy sensors
Consumer electronics
Industrial automation
Display backlighting control
Photo-interrupters
The Si1145/46/47 is a low-power, reflectance-based, infrared proximity, ultraviolet
(UV) index, and ambient light sensor with I2C digital interface and programmable-
event interrupt output. This touchless sensor IC includes an analog-to-digital
converter, integrated high-sensitivity visible and infrared photodiodes, digital signal
processor, and one, two, or three integrated infrared LED drivers with fifteen
selectable drive levels. The Si1145/46/47 offers excellent performance under a wide
dynamic range and a variety of light sources including direct sunlight. The Si1145/46/
47 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. With two or more LEDs, the Si1146/47 is capable of
supporting multiple-axis proximity motion detection. The Si1145/46/47 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
VDD
INT
DNC
10
1
9
28
QFN-10
37
4
5
6
DNC
LED1
GND
LED3/CVDD
LED2/CVDD
Rev. 1.3 12/14
Copyright © 2014 by Silicon Laboratories
Si1145/46/47




Silicon Laboratories

Si1145 Datasheet Preview

Si1145 Datasheet

PROXIMITY/UV/AMBIENT LIGHT SENSOR IC

No Preview Available !

Si1145/46/47
Functional Block Diagram
VDD
INT
SCL
SDA
Regulator
Temp
Visible
A
M
U
X
Infrared
ADC
Filter
LED
Drivers
Digital Sequencer & Control Logic
I2C Registers
Oscillator
LED1
LED21
LED32
GND
1. Si1146 and Si1147 only. Must be tied to VDD with Si1145.
2. Si1147 only. Must be tied to VDD with Si1145 and Si1146.
3.3 V
Host
SDA
SCL
INT
0.1 uF
Si1145
SDA LED1
SCL GND
VDD CVDD
INT CVDD
30 ohm
5%, 1/16 W
15 µF, 20%, >6 V
Figure 1. Si1145 Basic Application
3.3 V
4.3 V
Host
0.1 uF
Si1147
SDA
LED1
SCL GND
VDD
LED3
INT LED2
No
Pop
30 ohm
5%, 1/16 W
22 uF, 20%, >6V
Figure 2. Si1147 Application with Three LEDs and Separate LED Power Supply
Note: For more application examples, refer to “AN498: irLED Selection Guide for Si114x Proximity Applications”.
2 Rev. 1.3


Part Number Si1145
Description PROXIMITY/UV/AMBIENT LIGHT SENSOR IC
Maker Silicon Laboratories
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Si1145 Datasheet PDF





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