Si1146 Datasheet PDF - Silicon Laboratories
| Part Number | Si1146 | |
| Description | PROXIMITY/UV/AMBIENT LIGHT SENSOR IC | |
| Manufacturers | Silicon Laboratories | |
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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 glass Temperature 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
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Si1145/46/47
Table 2. Performance Characteristics1
Parameter
Symbol
Test Condition
Min Typ Max Unit
IDD OFF Mode
Ioff VDD < VDD_OFF (leakage from SCL, — 240 1000 nA
SDA, and INT not included)
IDD Standby Mode
Isb
IDD Standby Mode
Isb
IDD Actively Measuring
Peak IDD while LED1,
LED2, or LED3 is Actively
Driven
LED Driver Saturation
Voltage2,3
Iactive
No ALS / PS Conversions
No I2C Activity
VDD = 1.8 V
No ALS / PS Conversions
No I2C Activity
VDD =3.3 V
Without LED influence, VDD = 3.3 V
VDD = 3.3 V
Vdd=1.71 to 3.6 V
PS_LEDn=0001
PS_LEDn=0010
PS_LEDn=0011
PS_LEDn=0100
PS_LEDn=0101
PS_LEDn=0110
PS_LEDn=0111
PS_LEDn=1000
PS_LEDn=1010
PS_LEDn=1010
PS_LEDn=1011
PS_LEDn=1100
PS_LEDn=1101
PS_LEDn=1110
PS_LEDn=1111
— 150 500 nA
— 1.4 — µA
— 4.3 5.5 mA
— 8 — mA
mV
— 50 70
— 60 105
— 70 105
— 80 105
— 115 450
— 150 450
— 185 450
— 220 450
— 255 450
— 290 450
— 315 600
— 340 600
— 360 600
— 385 600
— 410 600
LED1, LED2, LED3
Pulse Width
tPS
— 25.6 30
µs
LED1, LED2, LED3, INT,
SCL, SDA
Leakage Current
VDD = 3.3 V
–1 — 1 µA
Notes:
1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx.
2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply
and voltage drop allow the driver to saturate and current regulation is lost.
3. Guaranteed by design and characterization.
4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes.
Assumes default settings.
Rev. 1.3
5
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| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ Si1146.PDF Datasheet ] | |
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