Si1120 Proximity and Ambient Light Sensor IC

Si1120 Proximity and Ambient Light Sensor Block Diagram

The QuickSense Si1120 is the industry’s most sensitive active infrared proximity sensor IC, enabling innovative touchless human interface applications with ultra-low power advantages. Consisting of an infrared LED driver, an infrared photodiode, an ambient light sensor and control logic, the device is packaged in a 3 mm x 3 mm clear DFN. The high-sensitivity infrared photodiode provides a single-pulse infrared proximity measurement, offering customers an opportunity to implement infrared light emitting diodes with unusually low power levels. When combined with a Silicon Labs capacitive touch-sense microcontroller (MCU), the Si1120 proximity and ambient light sensor IC is capable of advanced motion and gesture recognition.

Silicon Labs Si114x optical sensor products offer superior range and sensitivity while keeping power demands low. Use this optical sensor current estimator utility to help you determine the current consumption of your application. Specify whether you need proximity light sensing, ambient light sensing, or both. Choose your channels, and view the estimated average current results in real time.

The Si1120 proximity and ambient light sensor IC is supported within the QuickSense Development Studio.

Features

PWM output
Ambient light sensor
Seven precision optical measurement modes:

3 proximity ranges
3 dc ambient light sensing ranges
1 calibration mode

Low-noise ambient cancelling circuit allows maximum sensitivity with 8–12 bit resolution
Works in direct sunlight (100 klux)
Minimum reflectance sensitivity <1 μW/cm²
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

Applications

Touch screens
Instrumentation panels
Kiosks
Gaming systems
Industrial interface
Security
Smoke detectors
Residential HVAC
Home appliances
Toys
Keyboards
Fax/printer/scanner front panels

Documentation Expand All Collapse All

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Data Sheet (2)

Document Name	Description	Version	Last Updated
Si1120.pdf	Si1120 Data Sheet	1.0	8/27/2010
Si1120_Chinese.pdf	Si1120 Data Sheet (Chinese)	1.0	9/29/2010

Data Short (1)

Document Name	Description	Version	Last Updated
Si1120_short.pdf	Si1120 Data Short	05.18.09	10/19/2009

User Guides (4)

Document Name	Description	Version	Last Updated
QuickSense-FrontPanel_UG.pdf	QuickSense Front Panel User's Guide	0.1	10/27/2009
QuickSense_Studio_UG.pdf	QuickSense Studio User's Guide	0.2	12/18/2009
Si1120-Slider-DEMO.pdf	Si1120 Infrared Slider Demo Kit User's Guide	0.2	10/21/2009
Si1120-EK.pdf	Si1120-EK User's Guide	0.2	12/8/2009

Application Notes (2)

Document Name	Description	Version	Last Updated
AN376.pdf	AN376: Effects of ESD Protection Devices on Capacitive Sensing Performance	0.1	10/27/2009
AN442.pdf	AN442: Si1102 and Si1120 Designer's Guide	0.1	10/27/2009

White Papers (2)

Document Name	Description	Version	Last Updated
Capacitive and proximity sensing_WP.pdf	Developing Next-Generation Human Interfaces using Capacitive and Infrared Proximity Sensing White Paper	0.1	8/30/2010
Safeguarding-Public-Access-Terminals-with-Optical-Tamper-Detection-Technology.pdf	Safeguarding Public Access Terminals with Optical Tamper Detection Technology	1.0	11/21/2011

Miscellaneous (2)

Document Name	Description	Version	Last Updated
Si1120_Slider_qs_guide.pdf	Si1120 Slider Demo Board Quick-Start Guide	0.3	10/19/2009
Si1120EK_qs_guide.pdf	Si1120-EK Quick-Start Guide	0.2	10/21/2009

PCN (1)

Document Name	Description	Version	Last Updated
1111011A Si1120 Assembly Thailand Flood Recovery.pdf	1111011A Si1120 Assembly Thailand Flood Recovery

Development Kits and Featured Software

Design Tools Expand All Collapse All

Get notified when these files are updated.

Software (4)

Document Name	Description	Version	Updated
IrSlider_EK.exe	IrSlider Evaluation Kit
QuickSense_Studio.exe	QuickSense Studio
QuickSense_FrontPanelSTB.exe	QuickSense_FrontPanelSTB Evaluation Kit
Si1120_EK.exe	Si1120 Evaluation Kit

Schematics/Layout (2)

Document Name	Description	Version	Updated
ULADI_SiliconLabs_Reader.exe	ADI Ultra-Librarian Reader for CAD/CAE Schematic Footprints and Symbols .bxl Files
SI1120.bxl	Si1120 CAD/CAE Schematic Footprints and Symbols	1.0

Training (1)

Document Name	Description	Version	Updated
Solutions_Active_Infrared_Proximity_Sensing.pdf	Silicon Labs Solutions for Active Infrared Proximity Sensing

Product Matrix

Part Number		Available Documents	Description	Infrared Range	Package	Output Type	Dev Kit	Ambient Light Sensor
Si1120-A-GM		Data Sheet Data Sheet Data Short	PWM proximity sensor with ambient light sensor	50 cm	3 x3 mm ODFN8	PWM	Si1120EK	Yes

Education Center

Training & Resources

Featured Videos

QuickSense Portfolio Overview
QuickSense^TM Human Interface Portfolio Overview

Advanced Gesture Recognition-Go Beyond Touch Sense

Proximity & Ambient Light Sensor Solutions

Featured Web Utilities

IR Range Estimator

This web-based utility will help you determine if the object you're detecting with the Si114x proximity and ambient light sensors will be within range, and if the SNR threshold is high enough to trigger a detection event. This tool can determine if you have adequate SNR in less than a minute.
» IR Range Estimator

Optical Sensor Current Estimator

This current estimator utility will help you determine how much current is required for your application. Specify whether you need proximity light sensing, ambient light sensing, or both. Choose your channels, and view the estimated average current results in real time.
» Optical Sensor Current Estimator

Featured White Papers

Designing Intuitive Gesture-Based Human Interface Systems

Unlike human-to-human gesturing, human-machine gesturing does not have a foundation of thousands of years of history to serve as a context and this poses a challenge for human interface system designers. How does a system designer minimize the pain of "learning" gestures for the user?
» Designing Intuitive Gesture-Based Human Interface Systems

Capacitive Touch and Proximity Sensing Design Considerations

The availability of enabling technology that can revolutionize the way we interact with consumer electronics products and an urgency to incorporate this technology demonstrates the increased importance consumers are placing on interface design. What defines good human interface design, and how can system designers implement a smarter, friendlier and more intuitive solution?
» Capacitive Touch and Proximity Sensing Design Considerations

Featured Presentations and Tutorials

QuickSense™ Touchless Slider Evaluation Kit Demonstration

See how quickly and easily you can implement complex gesture recognition using intuitive software development tools for configuring, building and calibrating active infrared sensing systems.
» QuickSense™ Touchless Slider Evaluation Kit Demonstration

C8051F990 Slider Demonstration

This video provides a brief introduction to the Silicon Labs capacitance to digital converter and highlights a low power slider implemented with the C8051F990 capacitive touch sense MCU. In addition, the video provides a visual demonstration of the wake-on slide feature and the evaluation kit functions.
» C8051F990 Slider Demonstration

Solutions for Active Infrared Proximity Sensing

See a demonstration of the QuickSense™ API and learn about the structure of the projects created by the QuickSense™ Configuration Wizard.
» Solutions for Active Infrared Proximity Sensing

QuickSense™ API Demonstration

See a demonstration of the QuickSense™ API and learn about the structure of the projects created by the QuickSense™ Configuration Wizard.
» QuickSense™ API Demonstration

Music Keyboard Demo

This application example uses the Keyboard Evaluation Kit to illustrate the use of capacitive sensing switches using the C8051F700 family of MCUs with Silicon Labs Capacitance to Digital Converter (CDC) technology.
» Music Keyboard Demo

QuickSense™ Studio Demo

See how you can implement capacitive and IR sensors in minutes! This video takes you step by step through the features and operation of the QuickSense™ Studio application, a common development environment that simplifies characterization of capacitive and IR sensing systems using Silicon Labs human interface products.
» QuickSense™ Studio Demo

Sensors

Title Content
QuickSense™ Si1120 Proximity and Ambient Light Sensor ICs

Features

Applications