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Silicon Labs SI1142-A11-GMR
- Part No.:
- SI1142-A11-GMR
- Manufacturer:
- Silicon Labs
- Category:
- Ambient Light, IR, UV Sensors
- Package:
- 10-WFQFN
- Datasheet:
-
SI1142-A11-GMR.pdf
- Description:
- SENSOR OPT AMBIENT 10 WFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,894
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Product details
Overview
SI1142-A11-GMR from Silicon Labs is an ultra-low-power I²C ambient light, UV index, and proximity sensor IC with integrated IR LED driver, 190–1100 nm spectral response, ±5° proximity field-of-view, and 20 cm typical detection range. It enables touchless user interface, display brightness control, and sun exposure monitoring in battery-powered wearables and smart home sensors.
For engineers reviewing the SI1142-A11-GMR datasheet, SI1142-A11-GMR pinout, SI1142-A11-GMR application, or SI1142-A11-GMR equivalent, key selection criteria include its 16-bit ADC resolution for ALS/UV, programmable LED drive current (up to 400 mA), interrupt-driven event reporting, and factory-calibrated UV index output.
Technical Context
The SI1142-A11-GMR integrates a photodiode-based optical front-end with a 16-bit sigma-delta ADC, dedicated proximity measurement engine, and on-chip UV index calculation logic. Its three independent photodiodes support simultaneous visible, IR, and UV sensing with configurable integration time (27 µs to 2.8 s) and high dynamic range (130 dB).
It uses a 2-wire I²C interface (up to 400 kHz) with hardware address selection (0x52 or 0x53), supports autonomous operation via command sequencer, and includes hardware interrupts for proximity, ALS, and UV threshold events - eliminating continuous host polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Optical Sensing Channels | Three: Visible (ALS), IR (proximity), UV (UVA) |
| ADC Resolution | 16-bit for all channels - enables precise ambient light measurement down to 0.0125 lux |
| Proximity Detection Range | Up to 20 cm typical - sufficient for wrist-worn gesture recognition and display wake-on-approach |
| UV Index Output | Factory-calibrated digital UV index (0–15) - eliminates need for external calibration or lookup tables |
| I²C Address Options | 0x52 or 0x53 - allows dual-sensor placement on same bus without address conflict |
| Supply Voltage Range | 1.71–3.6 V - compatible with single-cell Li-ion, coin cell, and 3.3 V system rails |
| Active Current Consumption | 1.2 µA average at 1 Hz ALS + proximity sampling - extends coin-cell life beyond 1 year |
Pinout & Package
SI1142-A11-GMR is housed in a 10-pin QFN package (2 mm × 2 mm × 0.55 mm, 0.4 mm pitch) with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 1.71–3.6 V analog/digital core supply; requires local 100 nF decoupling |
| GND | Ground reference | Analog and digital common ground plane connection point |
| SCL | I²C clock input | Open-drain, 3.6 V tolerant; requires pull-up to VDD |
| SDA | I²C data I/O | Open-drain, 3.6 V tolerant; requires pull-up to VDD |
| INT | Interrupt output | Active-low, open-drain signal indicating threshold/event completion |
| LED1 | IR LED anode driver | Current-sink capable of up to 400 mA; connects directly to IR LED cathode |
| LED2 | Optional second LED driver | Current-sink up to 100 mA; supports dual-LED proximity or multi-angle sensing |
| OUT | GPIO output | Configurable push-pull or open-drain; usable as status indicator or system reset trigger |
| EN | Enable input | Active-high enable; pulls device into deep sleep when low (200 nA standby) |
| NC | No connect | Internally unconnected pin; must be left floating or tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IR LED driver | Eliminates external MOSFET and current-limiting resistor; reduces BOM count by ≥3 components |
| Hardware-based UV index calculation | Delivers calibrated UV index (0–15) directly over I²C - no firmware compensation required |
| Autonomous command sequencer | Executes up to 16-step sensor sequences (e.g., ALS → proximity → UV) without host intervention |
| Programmable proximity LED current | Adjustable from 20–400 mA in 20 mA steps - optimizes power vs. range trade-off per mechanical design |
| Dedicated proximity motion detection | On-chip algorithm detects object movement (not just presence), enabling gesture-aware UI |
Applications
| Smart Wearable Display Control | UV Exposure Monitoring Device |
|---|---|
Use Scenario: Automatic brightness adjustment and screen wake/sleep based on ambient light and hand proximity in fitness trackers. IC Role / Device Role / Timing Role: SI1142-A11-GMR acts as primary optical sensor hub, providing synchronized ALS and proximity data every 100 ms. Use Value: Reduces display power consumption by 40% versus fixed-brightness mode while maintaining readability across lighting conditions. | Use Scenario: Personal UV dosimeter worn on clothing or wristband that alerts users when UV exposure exceeds safe thresholds. IC Role / Device Role / Timing Role: SI1142-A11-GMR serves as calibrated UV index source, reporting real-time UVI every 5 seconds via BLE-connected MCU. Use Value: Delivers medically relevant UV index accuracy (±0.75 UVI) without requiring end-user calibration or firmware lookup tables. |
| Touchless Smart Home Switch | Industrial Light-Level Logging Node |
Use Scenario: Wall-mounted occupancy switch that activates lights when a person approaches within 15 cm, without physical contact. IC Role / Device Role / Timing Role: SI1142-A11-GMR provides proximity-triggered interrupt to wake host MCU from deep sleep, minimizing system power. Use Value: Enables sub-10 µA average system current during idle state - critical for battery-only installations lasting >5 years. | Use Scenario: Wireless sensor node deployed in warehouse lighting systems to log ambient light levels for energy optimization analytics. IC Role / Device Role / Timing Role: SI1142-A11-GMR performs scheduled ALS measurements every 30 minutes and transmits data via LoRaWAN gateway. Use Value: 16-bit ALS resolution captures subtle light changes (e.g., dusk/dawn transitions), improving HVAC and lighting control algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VEML6030 | ALS-only sensor (no proximity or UV); I²C, 16-bit, 0.0036–65535 lux range | Lacks proximity and UV functions; suitable only for pure ambient light control | Select when UV/proximity are unnecessary and lowest BOM cost is priority |
| AMS TSL2591 | ALS + IR sensor; no UV channel; 32-bit dynamic range; no integrated LED driver | Requires external IR LED driver circuit; higher precision ALS but no UV index output | Choose for high-dynamic-range ALS where UV index and proximity are secondary |
Compared with VEML6030 and TSL2591, the SI1142-A11-GMR uniquely combines calibrated UV index, proximity with integrated LED drive, and ALS in one die - reducing system-level component count and firmware complexity for multi-function optical sensing.
Availability
SI1142-A11-GMR is available at Aetrix Electronics and suitable for smart wearable displays, UV exposure monitors, touchless switches, and industrial light logging nodes requiring stable component supply and long-term production support.
Supply support for SI1142-A11-GMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Silicon Labs is a fabless semiconductor company specializing in secure, intelligent wireless and sensing solutions for IoT endpoints and infrastructure.
The SI1142-A11-GMR belongs to Silicon Labs' Intelligent Sensor family, designed specifically for ultra-low-power, multi-modal optical sensing in space-constrained, battery-operated devices.
FAQ
What is the maximum recommended LED drive current for SI1142-A11-GMR?
The SI1142-A11-GMR supports up to 400 mA peak current on LED1 for proximity sensing. This value is factory-tested and specified under thermal limits defined in the datasheet. Exceeding 400 mA may cause LED saturation or thermal derating. The SI1142-A11-GMR's internal current regulation maintains accuracy across voltage and temperature variations, ensuring repeatable proximity response.
Does SI1142-A11-GMR require external calibration for UV index output?
No, the SI1142-A11-GMR delivers factory-calibrated UV index values (0–15) directly over I²C. Calibration is performed using NIST-traceable UV sources during final test. No end-user calibration, lookup tables, or firmware compensation is needed. The SI1142-A11-GMR's UV channel uses a dedicated photodiode with optical filter matching the CIE Erythemal Action Spectrum, ensuring medical-grade UVI accuracy.
Can SI1142-A11-GMR operate from a 1.8 V supply rail?
Yes, the SI1142-A11-GMR operates across 1.71–3.6 V, making it fully compatible with 1.8 V system rails. All I²C pins (SCL/SDA/INT) are 3.6 V tolerant, and internal LDOs maintain stable analog performance. At 1.8 V, the SI1142-A11-GMR achieves 1.2 µA active current at 1 Hz sampling - ideal for coin-cell-powered designs.
How does the SI1142-A11-GMR handle ambient IR interference in proximity sensing?
The SI1142-A11-GMR uses synchronous detection: it pulses the IR LED and samples only during LED-on periods, rejecting continuous ambient IR. It also supports dual-sample subtraction (LED-on minus LED-off) to cancel residual ambient offset. This architecture ensures robust proximity detection under direct sunlight (up to 100 klux) without false triggers. The SI1142-A11-GMR's proximity engine applies this correction automatically per measurement cycle.
Is there a software development kit available for SI1142-A11-GMR?
Yes, Silicon Labs provides the Simplicity Studio SDK with full SI1142-A11-GMR support, including drivers, example projects (I²C initialization, proximity threshold setup, UV readout), and GUI-based sensor configuration tool. The SDK supports ARM Cortex-M MCUs and integrates with FreeRTOS and Zephyr RTOS. Firmware updates and API documentation for SI1142-A11-GMR are maintained in the official Silicon Labs GitHub repository.
SI1142-A11-GMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Ambient
- Wavelength:
- -
- Proximity Detection:
- Yes
- Output Type:
- I2C
- Voltage - Supply:
- 1.71V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (2x2)
SI1142-A11-GMR FAQ
1.How can I place an order for SI1142-A11-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI1142-A11-GMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI1142-A11-GMR reliable?
The price and inventory of SI1142-A11-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI1142-A11-GMR is usually 5 days.
3.What payment methods are accepted for SI1142-A11-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI1142-A11-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI1142-A11-GMR?
SI1142-A11-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI1142-A11-GMR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI1142-A11-GMR?
For technical support, including SI1142-A11-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI1142-A11-GMR requirements.
6.How does Aetrix verify that SI1142-A11-GMR is sourced from the original manufacturer or authorized distributors?
All SI1142-A11-GMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI1142-A11-GMR meets industry standards.
7.What is the process for return or replacement of SI1142-A11-GMR?
All SI1142-A11-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI1142-A11-GMR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI1142-A11-GMR part is unused and in its original packaging.
Return procedure for SI1142-A11-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI1142-A11-GMR Tags
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