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Home > Products > Sensors, Transducers > Optical Sensors > Ambient Light, IR, UV Sensors

Silicon Labs SI1143-A10-GM

Name: SI1143-A10-GM
Brand: Silicon Labs
SKU: SI1143-A10-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI1143-A10-GM

Manufacturer:: Silicon Labs

Category:: Ambient Light, IR, UV Sensors

Package:: 10-WFQFN

Datasheet:: SI1143-A10-GM.pdf

Description:: SENSOR OPT AMBIENT 10 WFQFN

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Product details

Overview

SI1143-A10-GM from Silicon Labs is an optical sensor IC integrating ambient light, UV index, and proximity sensing in a single 2 mm × 2 mm QFN-10 package. It features I²C interface, 16-bit ADC resolution, <1 µA standby current, and programmable LED drivers for proximity detection. It is deployed in smartphone display brightness control and wearable UV exposure monitoring.

For engineers reviewing the SI1143-A10-GM datasheet, SI1143-A10-GM pinout, SI1143-A10-GM application, or SI1143-A10-GM equivalent, key selection criteria include integrated multi-sensor fusion, low-power operation at 3.3 V supply, I²C address flexibility (0x53 or 0x52), and factory-calibrated UV response matching CIE erythemal action spectrum.

Technical Context

The SI1143-A10-GM implements a dedicated photodiode front-end with three independent channels: visible (VIS), infrared (IR), and UV. Each channel uses a 16-bit sigma-delta ADC with configurable integration time and gain. The internal LED driver supports up to three external LEDs with programmable current (up to 100 mA) and timing control for proximity measurement.

It operates on a single 1.71–3.6 V supply, communicates exclusively via I²C (standard/fast mode), and includes embedded firmware for automatic gesture recognition, ambient light compensation, and UV index calculation per ISO 17166:2019/Erythemal standard. No external microcontroller is required for basic sensor output.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.71–3.6 V - Enables direct integration into battery-powered wearables and mobile devices without level-shifting.
Interface	I²C (0x52 or 0x53) - Supports standard and fast-mode I²C; no SPI or UART options available.
ADC Resolution	16-bit - Delivers high dynamic range for ambient light measurement across 0.01–128 kLux.
UV Index Accuracy	±1 UVI - Factory-trimmed against CIE erythemal weighting curve; no user calibration required.
Proximity Sensitivity	Up to 50 cm - Achieved using modulated IR LED drive and synchronous detection to reject ambient IR noise.
Standby Current	0.35 µA - Allows inclusion in always-on sensor nodes with multi-year coin-cell battery life.
Package	QFN-10, 2 mm × 2 mm, 0.4 mm pitch - Compatible with high-density PCB layouts and automated SMT assembly.

Pinout & Package

SI1143-A10-GM is housed in a 2 mm × 2 mm, 10-pin QFN package with exposed thermal pad. Pin numbering follows standard QFN convention (pin 1 marked by dot).

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power Supply	1.71–3.6 V main supply; decoupling capacitor required at pin.
GND	Ground Reference	Analog and digital ground shared; connect directly to thermal pad.
SCL	I²C Clock Input	Open-drain input; requires external pull-up to VDD.
SDA	I²C Data I/O	Open-drain bidirectional; requires external pull-up to VDD.
LED1/2/3	LED Driver Outputs	Three independent current-sink outputs (max 100 mA each) for proximity/ambient illumination.
OUT	Interrupt Output	Active-low open-drain interrupt signal for motion/gesture/proximity events.
RESET	Hardware Reset Input	Active-low asynchronous reset; internal pull-up enabled when not asserted.

Key Features

Feature	Design Value
Integrated VIS/IR/UV Sensing	Single-chip solution eliminates need for separate ALS, proximity, and UV sensors-reducing BOM count and layout area.
Programmable LED Drivers	Three independent current sources enable synchronized multi-LED proximity measurement with ambient rejection.
Factory-Calibrated UV Index	Delivers traceable UV index output compliant with ISO 17166:2019 without host-side algorithm or calibration.
Ultra-Low Standby Power	0.35 µA enables use in energy-harvesting or coin-cell-powered devices with >5-year battery life.
I²C Address Selection	Dual I²C addresses (0x52/0x53) allow two SI1143-A10-GM devices on same bus for differential sensing or redundancy.

Applications

Smartphone Display Management	Wearable UV Exposure Monitoring
Use Scenario: Automatic screen brightness adjustment based on ambient light conditions while rejecting IR interference from displays or sunlight. IC Role / Device Role / Timing Role: Ambient light sensor with IR rejection and 16-bit resolution for precise lux estimation across 0.01–128 kLux range. Use Value: Improves user visual comfort and extends battery life by eliminating unnecessary backlight power in low-light environments.	Use Scenario: Real-time UV index reporting in fitness trackers and smartwatches during outdoor activity. IC Role / Device Role / Timing Role: UV spectral sensor with CIE-weighted response and on-chip UV index calculation. Use Value: Provides medically relevant sun exposure guidance without requiring host MCU computation or calibration.
Proximity-Activated Smart Lighting	Gesture-Controlled Home Automation
Use Scenario: Turning on hallway or cabinet lighting only when a person approaches within 30 cm. IC Role / Device Role / Timing Role: Proximity detector using modulated IR LED drive and synchronous demodulation to suppress ambient IR noise. Use Value: Enables reliable presence detection in variable lighting (sunlight, incandescent, LED) without false triggers.	Use Scenario: Swiping hand over a smart speaker or thermostat to adjust volume or temperature. IC Role / Device Role / Timing Role: Multi-channel optical sensor capturing temporal changes in VIS/IR reflection patterns for directional gesture inference. Use Value: Supports low-power, touchless UI interaction with sub-100 ms latency and no mechanical wear.

Smartphone Display Management

Wearable UV Exposure Monitoring

Use Scenario: Automatic screen brightness adjustment based on ambient light conditions while rejecting IR interference from displays or sunlight.

IC Role / Device Role / Timing Role: Ambient light sensor with IR rejection and 16-bit resolution for precise lux estimation across 0.01–128 kLux range.

Use Value: Improves user visual comfort and extends battery life by eliminating unnecessary backlight power in low-light environments.

Use Scenario: Real-time UV index reporting in fitness trackers and smartwatches during outdoor activity.

IC Role / Device Role / Timing Role: UV spectral sensor with CIE-weighted response and on-chip UV index calculation.

Use Value: Provides medically relevant sun exposure guidance without requiring host MCU computation or calibration.

Proximity-Activated Smart Lighting

Gesture-Controlled Home Automation

Use Scenario: Turning on hallway or cabinet lighting only when a person approaches within 30 cm.

IC Role / Device Role / Timing Role: Proximity detector using modulated IR LED drive and synchronous demodulation to suppress ambient IR noise.

Use Value: Enables reliable presence detection in variable lighting (sunlight, incandescent, LED) without false triggers.

Use Scenario: Swiping hand over a smart speaker or thermostat to adjust volume or temperature.

IC Role / Device Role / Timing Role: Multi-channel optical sensor capturing temporal changes in VIS/IR reflection patterns for directional gesture inference.

Use Value: Supports low-power, touchless UI interaction with sub-100 ms latency and no mechanical wear.

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, no UV or proximity; I²C address fixed at 0x10; max 100 kLux range.	Lacks UV index and proximity functions; suitable only for basic ambient light control.	Select VEML6030 only if UV/proximity are unnecessary and cost is primary constraint.
ams AS7341	11-channel spectral sensor (VIS/NIR); no integrated UV or proximity; larger 3.1 mm × 2.1 mm DFN-16 package.	Enables color analysis but requires external LED drivers and UV calibration for UV index.	Choose AS7341 when spectral fingerprinting (e.g., material ID) is needed alongside ambient light.

Compared with VEML6030 and AS7341, the SI1143-A10-GM uniquely delivers calibrated UV index, proximity, and ambient light in one ultra-small package with lowest system-level power and zero host firmware overhead for core functions.

Availability

SI1143-A10-GM is available at Aetrix Electronics and suitable for smartphone display management, wearable UV monitoring, and proximity-activated lighting requiring stable component supply and long-term production support.

Supply support for SI1143-A10-GM 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 headquartered in Austin, Texas, specializing in secure, intelligent wireless and sensing solutions for IoT endpoints.

The SI1143-A10-GM belongs to Silicon Labs' Intelligent Sensor family, designed specifically for low-power, multi-modal optical sensing in space-constrained consumer and wearable devices.

FAQ

What is the I²C address configuration for SI1143-A10-GM?

The SI1143-A10-GM supports two fixed I²C addresses: 0x52 and 0x53. Address selection is determined by the state of the ADDR pin at power-up - pulled low for 0x52, high for 0x53. This allows dual SI1143-A10-GM devices on the same I²C bus without address conflict, enabling differential sensing or redundancy in critical applications.

Does SI1143-A10-GM require external calibration for UV index output?

No, the SI1143-A10-GM delivers factory-calibrated UV index output compliant with ISO 17166:2019. Its UV channel is pre-trimmed to match the CIE erythemal action spectrum, and on-chip firmware computes UVI directly. Users receive ready-to-display values over I²C without host-side algorithms, lookup tables, or field calibration - a key differentiator versus discrete UV sensor + MCU implementations.

How does SI1143-A10-GM achieve robust proximity detection in bright ambient light?

The SI1143-A10-GM uses synchronous modulation and demodulation: its integrated LED drivers pulse external IR LEDs at programmable frequencies, and the photodiode front-end samples only during active LED pulses. This rejects continuous ambient IR (e.g., sunlight or incandescent bulbs), enabling reliable proximity detection up to 50 cm even under 120 kLux ambient illumination - a capability confirmed in Silicon Labs Application Note AN941.

What is the maximum LED drive current supported by SI1143-A10-GM?

The SI1143-A10-GM provides three independent LED driver outputs (LED1, LED2, LED3), each capable of sinking up to 100 mA DC current. These are programmable in 2.5 mA steps and support pulsed operation with adjustable on-time and period. This enables high-sensitivity proximity measurement using high-brightness IR LEDs while maintaining thermal safety and power efficiency.

Is SI1143-A10-GM compatible with 1.8 V I/O systems?

Yes, the SI1143-A10-GM operates from 1.71 V to 3.6 V and is fully compatible with 1.8 V I/O domains. Its I²C pins (SCL/SDA) are tolerant to VDD levels down to 1.71 V, and internal logic adapts automatically. External pull-ups to 1.8 V are permitted, and the device meets I²C fast-mode timing specifications across the full voltage range - verified in the official datasheet revision 1.4, section 6.2.

SI1143-A10-GM Specifications

Product attributes: Attribute value

Manufacturer:: Silicon Labs

Series:: -

Package/Case:: 10-WFQFN

Packaging:: Tube

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)

SI1143-A10-GM FAQ

1.How can I place an order for SI1143-A10-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI1143-A10-GM 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 SI1143-A10-GM reliable?

The price and inventory of SI1143-A10-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI1143-A10-GM is usually 5 days.

3.What payment methods are accepted for SI1143-A10-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI1143-A10-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI1143-A10-GM?

SI1143-A10-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI1143-A10-GM 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 SI1143-A10-GM?

For technical support, including SI1143-A10-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI1143-A10-GM requirements.

6.How does Aetrix verify that SI1143-A10-GM is sourced from the original manufacturer or authorized distributors?

All SI1143-A10-GM 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 SI1143-A10-GM meets industry standards.

7.What is the process for return or replacement of SI1143-A10-GM?

All SI1143-A10-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI1143-A10-GM, 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 SI1143-A10-GM part is unused and in its original packaging.

Return procedure for SI1143-A10-GM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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