SI1141 Просмотр технического описания (PDF) - Silicon Laboratories
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SI1141 Datasheet PDF : 76 Pages
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Si1141/42/43
PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
Features
Integrated infrared proximity detector Accurate lux measurements with IR
Proximity detection adjustable from
correction algorithm
under 1 cm up to 200 cm
Industry's lowest power consumption
Three independent LED drivers
1.71 to 3.6 V supply voltage
15 current settings from 5.6 mA to 9 µA average current (LED pulsed
360 mA for each LED driver
25.6 µs every 800 ms at 180 mA
25.6 µs LED driver pulse width
plus 3 µA Si114x supply)
50 cm proximity range with single
< 500 nA standby current
pulse (<3 klx)
25.6 µs LED “on” time keeps total
15 cm proximity range with single
power consumption duty cycle low
pulse (>3 klx)
without compromising performance
Operates at up to 128 klx (direct
or noise immunity
sunlight)
Internal and external wake support
High reflectance sensitivity
Built-in voltage supply monitor and
< 1 µW/cm2
power-on reset controller
High EMI immunity without shielded Serial communications
packaging
Up to 3.4 Mbps data rate
Integrated ambient light sensor
Slave mode hardware address
100 mlx resolution possible,
decoding (0x5A)
allowing operation under dark glass Small-outline 10-lead 2x2 mm QFN
1 to 128 klx dynamic range possible Temperature Range
across two ADC range settings
–40 to +85 °C
Applications
Handsets
Heart rate monitoring
Pulse oximetry
Wearables
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 Si1141/42/43 is a low-power, reflectance-based, infrared proximity 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 Si1141/
42/43 offers excellent performance under a wide dynamic range and a variety of light
sources including direct sunlight. The Si1141/42/43 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 Si1142/43 is capable of supporting multiple-axis proximity
motion detection. The Si1141/42/43 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
2
8
QFN-10
3
7
4
6
5
DNC
LED1
GND
LED3/CVDD
LED2/CVDD
Rev. 1.4 10/14
Copyright © 2014 by Silicon Laboratories
Si1141/42/43
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