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SI1145 Fiches technique(PDF) 1 Page - Silicon Laboratories

No de pièce SI1145
Description  Integrated infrared proximity detector
Download  70 Pages
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI1145 Fiches technique(HTML) 1 Page - Silicon Laboratories

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Rev. 1.0 11/14
Copyright © 2014 by Silicon Laboratories
Si1145/46/47-M01
Si1145/46/47-M01
PROXIMITY/UV/AMBIENT LIGHT SENSOR MODULE WITH
I2C INTERFACE
Features
Applications
Description
The Si1145/46/47-M01 is a low-power, reflectance-based, proximity, UV Index and
ambient light module with integrated single IR LED, two additional LED driver
outputs, I2C digital interface, and programmable-event interrupt output. This
touchless sensor module includes an analog-to-digital converter, integrated high-
sensitivity visible and infrared photodiodes, digital signal processor, and three
integrated infrared LED drivers with fifteen selectable drive levels. The Si1145/46/47-
M01 offers excellent performance under a wide dynamic range and a variety of light
sources including direct sunlight. The Si1145/46/47-M01 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 Si1145/46/47-M01 is capable of supporting multiple-axis
proximity motion detection. The Si1145/46/47-M01 devices are provided in a 10-lead
4.9x2.85x1.2 mm QFN package and are capable of operation from 1.71 to 3.6 V over
the –40 to +85 °C temperature range.
Integrated infrared proximity detector

Proximity detection adjustable from
under 1 cm to over 50 cm

Three independent LED drivers

15 current settings from 5.6 mA to
360 mA for each LED driver

25.6 μs LED driver pulse width

50 cm proximity range with single
pulse (<3 klx)

15 cm proximity range with single
pulse (>3 klx)

Operates at up to 128 klx (direct
sunlight)

High reflectance sensitivity
< 1 μW/cm2

High EMI immunity without shielded
packaging
Integrated UV index sensor
Integrated ambient light sensor

100 mlx resolution possible,
allowing operation under dark glass

1 to 128 klx dynamic range possible
across two ADC range settings

Accurate lux measurements with IR
correction algorithm
Industry's lowest power consumption

1.71 to 3.6 V supply voltage

9 μA average current (LED pulsed
25.6 μs every 800 ms at 180 mA
plus 3 μA Si1145/46/47-M01
supply)

< 500 nA standby current

Internal and external wake support

Built-in voltage supply monitor and
power-on reset controller

25.6 μs LED “on” time keeps total
power consumption duty cycle low
without compromising performance
or noise immunity
IR LED integrated inside the module
I2C Serial communications

Up to 3.4 Mbps data rate

Slave mode hardware address
decoding (0x60)
Small-outline 10-lead
4.9x2.85x1.2 mm QFN
Temperature Range

–40 to +85 °C
Handsets
Heart rate monitoring
Pulse oximetry
Wearables
E-book readers
Notebooks/Netbooks
Portable consumer electronics
Touchless switches
Touchless sliders
Consumer electronics
Display backlighting control
Pin Assignments


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