TSL2550 Ambient Light Sensor SMBus Interface IC (TSL2550 Light Sensor)
The TSL2550 Ambient Light Sensor is a digital light sensing IC designed to measure ambient light intensity and output the data through an SMBus two wire interface. It integrates dual photodiodes and an internal analog to digital converter, allowing it to provide light measurements that closely match human eye response in lux.
The sensor uses two channels, one sensitive to visible plus infrared light and another primarily sensitive to infrared. By comparing both channels, it compensates for IR interference and produces accurate ambient light readings.
Key Features
- Digital Ambient Light Sensor with SMBus interface
- Dual Photodiode System for IR compensation
- Built in ADC for direct digital output
- Wide Dynamic Range approx 12 bit effective
- Rejects 50Hz and 60Hz light flicker
- Low Power Consumption approx 1mW typical
- Power Down Mode for energy saving
Specifications
- Sensor Type: Digital ambient light sensor
- Interface: SMBus two wire serial interface
- Supply Voltage: 2.7V to 5.5V
- Output Type: Digital lux data
- Channels: 2 photodiodes visible plus IR and IR only
- Dynamic Range: approx 12 bit effective
- Conversion Time: approx 80ms to 400ms
- Operating Temperature: -40 to 85 degree C
- Package Type: SMD compact package
Applications
- Automatic display brightness control
- Mobile devices and laptops
- Camera exposure control
- Street lighting and smart lighting
- Industrial and embedded systems
Pin Configuration Typical
- VDD supply
- GND
- SMBCLK clock line
- SMBDATA data line
Working Principle
- Light falls on dual photodiodes
- Currents converted to digital values via ADC
- IR component compensated using second channel
- Output provided as lux value over SMBus
