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SI1120-A-GMR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
Rev. 1.0 8/10 Copyright © 2010 by Silicon Laboratories Si1120
Si1120
PROXIMITY/AMBIENT LIGHT SENSOR WITH PWM OUTPUT
Features
Applications
Description
The Si1120 is a low-power, reflectance-based proximity and ambient light
sensor with advanced analog signal processing and analog PWM output.
It includes an integrated differential photodiode, signal processor, and
LED driver. Proximity sensing is based on the measurement of reflected
light from an external, optically-isolated, strobed LED. A separate visible
light photodiode is used for ambient light sensing. The standard package
for the Si1120 is an 8-pin ODFN.
Typically 50 cm meter proximity
range with single pulse
Seven precision optical
measurement modes:
3 proximity ranges
3 dc ambient ranges
1 calibration mode
Low-noise ambient cancelling
circuit allows maximum
sensitivity with 8–12 bit resolution
ALS works in direct sunlight
(100 klux)
Minimum reflectance sensitivity
<1 µW/cm
2
High EMI immunity without
shielded packaging
Power supply: 2.2–3.7 V
Operating temperature range:
–40 to +85 °C
Typical 10 µA current
consumption
Programmable 400/50 mA LED
constant current driver output
Allows independent LED supply
voltage
Small outline 3 x 3 mm (ODFN)
Handsets
Touchless switches
Occupancy sensors
Consumer electronics
Notebooks/PCs
Industrial automation
Display backlighting control
Photo-interrupter
U.S. Patent #5,864,591
U.S. Patent #6,198,118
Other patents pending
Pin Assignments
MD
VSS
TXO
TXGD
SC
VDD
PRX
STX
1
2
3
4
8
7
6
5
Si1120
ODFN
Si1120
2 Rev. 1.0
Functional Block Diagram
Figure 1. Si1120 Typical Application Example of Digital Proximity and Ambient Light Sensor with
C8051F931 MCU and I
2
C Interface
Infrared
emitter
Ambient Light
Sources
Product
Case
IR
VIS
MUX
AMP
CMP
BUF
PRX
VDD
TXO
TXGDVSS
MD
SC
STX
VREG
RAMP
GEN
MODE
CTRL
TX
PWM
Output
Optical Block
Transparent
window
Transparent
window
VDD / DC+
GND / DC-
DCEN
VBAT
GND
P0.0/VREF
P0.1 / AGND
P0.2 / XTAL1
P0.3 / XTAL2
P0.4 / TX
P0.5 / RX
P0.6 / CNVSTR
P0.7 / IREF0
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
XTAL3
XTAL4
RST / C2CK
P2.7 / C2D
PRX
TXGD
TXO
STX
VSS
MD
SC
VDD
C8051F931
Si1120
C1
1.0 uF
C4
68.0 uF
R1
30 ohm
C2
10 uF
C3
0.1 uF
TX LED
3.3 V
Si1120
Rev. 1.0 3
TABLE OF CONTENTS
Section Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.2. Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.3. Proximity Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.4. Ambient-Light Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.5. Choice of LED and LED Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.6. Power-Supply Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.7. Practical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3. Pin Descriptions—Si1120 (ODFN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5. Photodiode Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
6. Package Outline (8-Pin ODFN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

SI1120-A-GMR

Mfr. #:
Buy SI1120-A-GMR
Manufacturer:
Silicon Labs
Description:
Proximity Sensors Proximity/Ambient Light Sensor with PWM Output
Lifecycle:
New from this manufacturer.
Delivery:
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