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TSL2561

Light-to-digital converter, 2-channel (visible+IR), 0.1-40000 lux, I2C, CLCC-6

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Manufacturer Part：

TSL2561

Package：

CLCC-6 (5.2 x 3.7 x 1.35mm, windowed)

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Description

Product Overview

The TSL2561 from ams-OSRAM is a light-to-digital converter that transforms light intensity into a digital signal via I2C. It features separate visible and infrared channel sensing, enabling accurate lux calculation across varying light sources in a CLCC-6 package.

Key Specifications

Sensing Channels 2 (Broadband + Infrared)
Dynamic Range 0.1 to 40,000+ lux
Resolution 16-bit per channel
Supply Voltage 2.7V to 3.6V
I2C Address Options 0x29, 0x39, 0x49
Operating Current 0.5 mA (active), 15 uA (standby)
Operating Temperature -30 to 70 C
Package CLCC-6 (5.2 x 3.7 x 1.35mm)

Features

  • Dual-channel sensing for accurate lux under any light source
  • Programmable gain (1x, 16x) and integration time
  • Three I2C address pins for multi-sensor systems
  • Interrupt output with programmable thresholds
  • Rejects 50/60Hz lighting flicker

Applications

  • Display backlight control
  • Ambient light sensing for smart devices
  • Street lighting control
  • Greenhouse and grow light monitoring
  • Industrial photometry

The TSL2561 from ams-OSRAM is a precision light-to-digital converter that provides a 16-bit digital output proportional to light intensity. Its dual-channel architecture with separate broadband and infrared photodiodes enables accurate illuminance (lux) calculation regardless of light source type. Programmable gain (1x and 16x) and integration time (13.7ms to 400ms) allow optimization for both bright sunlight and dim indoor environments. Three selectable I2C addresses enable multiple sensors on the same bus.

The TSL2561 uses dual-photodiode sensing to measure both broadband and infrared light. **Photodiode Array**: Channel 0 (broadband) responds to both visible and infrared wavelengths (300-1100nm). Channel 1 (infrared-only) responds primarily to infrared wavelengths. The difference (Ch0 – Ch1) represents the visible light component. **Lux Calculation**: The on-chip ADC converts photodiode currents to 16-bit digital values. The host MCU applies a formula using both channel readings to compute lux, with coefficients that compensate for different light source spectra (tungsten, fluorescent, daylight). **Gain and Integration**: Two gain settings (1x and 16x) adjust sensitivity for different light levels. Programmable integration time (13.7ms, 101ms, 402ms) controls the measurement window, with longer integration providing higher resolution. **50/60Hz Rejection**: The integration time of 101ms is specifically chosen to reject 50Hz and 60Hz AC lighting flicker. **Interrupt System**: A programmable threshold comparator generates an interrupt when light level crosses upper or lower limits, enabling event-driven monitoring without polling.

Pin Name Description
1 SDA I2C serial data
2 GND Ground
3 INT Interrupt output (active low)
4 SCL I2C serial clock
5 VDD Power supply (2.7V to 3.6V)
6 ADDR SEL I2C address select (float=0x39, GND=0x29, VDD=0x49)
  • Display Backlight: Automatic brightness adjustment for smartphones, tablets, and laptops
  • Smart Lighting: Daylight harvesting in building automation to optimize artificial lighting energy
  • Street Lighting: Dusk-to-dawn control with programmable ON/OFF thresholds
  • Greenhouse: Monitoring PAR light levels for optimal plant growth conditions
  • Industrial: Photometry and light level verification in manufacturing environments
Model Manufacturer Key Difference
TSL2591 ams-OSRAM Wider dynamic range, higher sensitivity
BH1750FVI-TR Rohm Single-channel, I2C, simpler lux output
VEML7700-TT Vishay 0-120klux, I2C, ambient light sensor
APDS-9301-020 Broadcom Dual-channel, I2C, similar architecture
OPT3001DNPR TI 0.01-83klux, I2C, auto-ranging
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5. Local Pickup in Shenzhen

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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