Document
Si1145/46/47-M01
PROXIMITY/UV/AMBIENT LIGHT SENSOR MODULE WITH I2C INTERFACE
Features
Integrated infrared proximity detector Accurate lux measurements with IR
Proximity detection adjustable from
correction algorithm
under 1 cm to over 50 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 Si1145/46/47-M01
50 cm proximity range with single
supply)
pulse (<3 klx)
< 500 nA standby current
15 cm proximity range with single
Internal and external wake support
pulse (>3 klx)
Built-in voltage supply monitor and
Operates at up to 128 klx (direct
power-on reset controller
sunlight)
25.6 µs LED “on” time keeps total
High reflectance sensitivity
power consumption duty cycle low
< 1 µW/cm2
without compromising performance
High EMI immunity without shielded
or noise immunity
packaging
IR LED integrated inside the module
Integrated UV index sensor
I2C Serial communications
Integrated ambient light sensor
Up to 3.4 Mbps data rate
100 mlx resolution possible,
Slave mode hardware address
allowing operation under dark glass
decoding (0x60)
1 to 128 klx dynamic range possible Small-outline 10-lead
across two ADC range settings
4.9x2.85x1.2 mm QFN
Temperature Range
–40 to +85 °C
Applications
Handsets Heart rate monitoring Pulse oximetry Wearables E-book readers Notebooks/Netbooks
Description
Portable consumer electronics Touchless switches Touchless sliders Consumer electronics Display backlighting control
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 highsensitivity visible and infrared photodiodes, digital signal processor, and three integrated infrared LED drivers with fifteen selectable drive levels. The Si1145/46/47M01 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.
Pin Assignments
Si114x-M01
DNC 1 SDA 2 SCL 3 VDD 4 INT 5
10 LEDA 9 LED1 8 GND 7 LED3/CVDD 6 LED2/CVDD
Rev. 1.0 11/14
Copyright © 2014 by Silicon Laboratories
Si1145/46/47-M01
Si1145/46/47-M01
Functional Block Diagram
Si114x-M01
Si114x Proximity/Ambient Light Sensor IC
VDD Regulator
LED1
Temp
A M
ADC
Visible
U X
Filter
LED Drivers
LED3 LED2
INT SCL SDA
Infrared
I2C
Digital Sequencer & Control Logic
Registers
Oscillator
LEDA LED1 LED3Note2 LED2Note1
GND
Notes: 1. Si1146-M01 and Si1147-M01 only. Must be tied to VDD with Si1145-M01. 2. Si1147-M01 only. Must be tied to VDD with Si1145-M01 and Si1146-M01.
Figure 1. Si114x-M01 Sensor Module
3.3 V
Host SDA SCL
INT
0.1 uF
SDA SCL VDD INT
Si1145
Si1145-M01
LED1
LED3 LED2
GND
LEDA LED1
LED3 LED2
30 Ohm 5%, 1/16 W
22 µF, 20%, >6 V
Figure 2. Si1145-M01 Module Basic Application Schematic for 1 LED
2 Rev. 1.0
3.3 V
Host SDA SCL INT
Si1145/46/47-M01
VBAT
(3.3 to 4.3V)
0.1 uF
SDA SCL VDD INT
Si1147
Si1147-M01
LED1
LED3 LED2
GND
No 30 Ohm Pop 5%, 1/16 W
LEDA LED1 LED3 LED2
22 µF, 20%, >6 V
Figure 3. Si1147-M01 Module Application Schematic for Long-Range Proximity Detection
Note: For more application examples, refer to “AN498: Si114x Designer’s Guide”.
3.3 V
VBAT
(3.3 to 4.3V)
Host SDA SCL
INT
0.1 uF
SDA SCL VDD INT
Si1147
Si1147-M01
LED1
LED3 LED2
GND
No Pop
LEDA LED1
LED3 LED2
5 Ohm 5%, 1/16 W
47 µF, 20%, >6 V
Figure 4. Si1147-M01 Module Application Schematic with Three LEDs and Separate LED Power Supply
Rev. 1.0
3
Si1145/46/47-M01 TABLE OF CONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.1. Performance Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.2. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.1. Introduction . . . . . . . . . . . . . . . .