S i 11 4 1 / 4 2 / 4 3 - M 0 1
P
ROXIMITY
/ A
M B I E N T
L
I G H T
S
E NS O R
M
O D U L E
Features
WI TH
I
2
C I
NTERFACE
Pin Assignments
Integrated infrared proximity detector
Industry's lowest power consumption
Proximity detection adjustable from
1.71 to 3.6 V supply voltage
under 1 cm to over 50 cm
25.6 µs LED “on” time keeps total
power consumption duty cycle low
Three independent LED drivers
without compromising performance
15 current settings from 5.6 mA to
or noise immunity
360 mA for each LED driver
25.6 µs LED driver pulse width
9 µA average current (LED pulsed
25.6 µs every 800 ms at 180 mA
50 cm proximity range with single
plus 3 µA Si1141/42/43-M01 supply)
pulse (<3 klx)
15 cm proximity range with single
< 500 nA standby current
pulse (>3 klx)
Internal and external wake support
Operates at up to 128 klx (direct
Built-in voltage supply monitor and
sunlight)
power-on reset controller
High reflectance sensitivity
Single IR LED integrated inside the
2
module
< 1 µW/cm
High EMI immunity without shielded
Serial communications
Up to 3.4 Mbps data rate
packaging
Slave mode hardware address
Integrated ambient light sensor
decoding (0x5A)
100 mlx resolution possible, allowing
Small-outline 10-lead
operation under dark glass
4.9x2.85x1.2 mm QFN
1 to 128 klx dynamic range possible
Temperature Range
across two ADC range settings
–40 to +85 °C
Accurate lux measurements with IR
correction algorithm
Si1141/42/43-M01
DNC 1
SDA 2
SCL 3
VDD 4
INT 5
10 LEDA
9 LED1
8 GND
7 LED3/CV
DD
6 LED2/CV
DD
Applications
Handsets
Heart rate monitoring
Pulse oximetry
E-book readers
Notebooks/Netbooks
Portable consumer electronics
Audio products
Security panels
Tamper detection circuits
Dispensers
Valve controls
Smoke detectors
Touchless switches
Touchless sliders
Occupancy sensors
Consumer electronics
Industrial automation
Display backlighting control
Description
The Si1141/42/43-M01 is a low-power, reflectance-based, infrared proximity and
ambient light module with integrated single IR LED, two additional LED driver outputs,
I
2
C 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 Si1141/42/43-M01 offers excellent
performance under a wide dynamic range and a variety of light sources including direct
sunlight. The Si1141/42/43-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 Si1141/42/43-M01 is capable of supporting multiple-axis proximity motion
detection. The Si1141/42/43-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.
Rev. 1.1 12/14
Copyright © 2014 by Silicon Laboratories
Si1141/42/43-M01
Si1141/42/43-M01
Functional Block Diagram
Si1143-M01
Si1143 Proximity/Ambient Light Sensor IC
VDD
Regulator
Temp
A
M
U
X
LED
Drivers
LED1
LEDA
LED1
ADC
Filter
LED3
LED2
LED3
2
LED2
1
Visible
Infrared
Digital Sequencer & Control Logic
INT
SCL
SDA
I
2
C
Registers
Oscillator
GND
Notes:
1. Si1142-M01 and Si1143-M01 only. Must be tied to V
DD
with Si1141-M01.
2. Si1143-M01 only. Must be tied to V
DD
with Si1141-M01 and Si1142-M01.
Figure 1. Si1143-M01 Sensor Module
3.3 V
30 Ohm
5%, 1/16 W
Host
SDA
SCL
SDA
Si1141
SCL
VDD
INT
0.1 uF
INT
Si1141-M01
LED1
LEDA
LED1
LED3
LED2
LED3
LED2
22 µF, 20%, >6 V
GND
Figure 2. Si1141-M01 Module Basic Application Schematic for 1 LED
3.3 V
V
BAT
(3.3 to 4.3V)
No
Pop
Host
SDA
SCL
SDA
Si1142
SCL
VDD
INT
0.1 uF
INT
Si1142-M01
LED1
30 Ohm
5%, 1/16 W
LEDA
LED1
LED3
LED2
LED3
LED2
22 µF, 20%, >6 V
GND
Figure 3. Si1142-M01 Module Application Schematic for Long-Range Proximity Detection
Note:
For more application examples, refer to “AN498: Si114x Designer’s Guide”.
2
Rev. 1.1
Si1141/42/43-M01
3.3 V
V
BAT
(3.3 to 4.3V)
No
Pop
Host
SDA
SCL
SDA
Si1143
SCL
VDD
INT
0.1 uF
INT
Si1143-M01
LED1
5 Ohm
5%, 1/16 W
LEDA
LED1
LED3
LED2
LED3
LED2
47 µF, 20%, >6 V
GND
Figure 4. Si1143-M01 Module Application Schematic with Three LEDs and
Separate LED Power Supply
Rev. 1.1
3
Si1141/42/43-M01
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1. Performance Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.2. Proximity Sensing (PS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3. Ambient Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.4. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3. Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1. Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2. Initialization Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3. Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4. Forced Conversion Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.5. Autonomous Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4. Programming Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1. Command and Response Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2. Command Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3. Resource Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4. Signal Path Software Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.5. I
2
C Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.6. Parameter RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
5. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
7. Package Outline: 10-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8. Suggested PCB Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
9. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
9.1. Si1141/42/43 Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
4
Rev. 1.1
Si1141/42/43-M01
1. Electrical Specifications
1.1. Performance Tables
Table 1. Recommended Operating Conditions
Parameter
V
DD
Supply Voltage
V
DD
OFF Supply Voltage
V
DD
Supply Ripple Voltage
Operating Temperature
SCL, SDA, Input High Logic
Voltage
SCL, SDA Input Low Logic
Voltage
PS Operation under
Direct Sunlight
IrLED Emission Wavelength
IrLED Supply Voltage
IrLED Supply Ripple Voltage
T
I
2
C
VIH
I
2
C
VIL
Edc
l
VLED
IrLED V
F
= 1.0 V nominal
Applies if IrLEDs use
separate supply rail
0–30 kHz
30 kHz–100 MHz
V
DD
above 1.71 V
Start-up
Symbol
V
DD
V
DD_OFF
OFF mode
V
DD
= 3.3 V
1 kHz–10 MHz
Test Condition
Min
1.71
–0.3
—
–40
V
DD
x0.7
0
—
750
V
DD
—
25
—
—
—
850
—
Typ
—
Max
3.6
1.0
50
85
V
DD
V
DD
x0.3
128
950
4.3
Unit
V
V
mVpp
°C
V
V
klx
nm
V
—
—
25
V
DD
x0.77
—
—
—
—
250
100
—
—
mVpp
mVpp
ms
V
Start-Up Time
LED3 Voltage
Table 2. Performance Characteristics
1
Parameter
I
DD
OFF Mode
I
DD
Standby Mode
Symbol
I
off
I
sb
Test Condition
V
DD
< V
DD_OFF
(leakage from SCL,
SDA, and INT not included)
No ALS / PS Conversions
No I
2
C Activity
V
DD
= 1.8 V
Min
—
—
Typ
240
150
Max
1000
500
Unit
nA
nA
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 I
active
for power estimation purposes.
Assumes default settings.
Rev. 1.1
5
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