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TSL235R Light-to-Frequency Converter

  • 604-00084 TSL235R Light to Frequency Converter
Product ID: 604-00084
In Stock: 45


The TSL235R light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS-integrated circuit. The output is a square wave (50% duty cycle) with frequency directly proportional to light intensity. Because it is TTL-compatible, the output allows direct interface to a microcontroller or other logic circuitry. The device has been temperature-compensated for the ultraviolet-to-visible light range of 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm.

Key Features:

  • Communicates directly with a Microcontroller
  • Single-Supply Operation
  • Compact 3-Lead clear plastic package
  • High-resolution conversion of light intensity to frequency with no external components

Application Ideas:

  • Camera exposure
  • Dimming displays
  • Machine vision

Note: Power-supply lines must be decoupled by a 0.01 µF to 0.1 µF capacitor with short leads placed close to the TSL235R. The output of the device is designed to drive a standard TTL or CMOS logic input over short distances. If lines greater than 12 inches are used on the output, a buffer or line driver is recommended


  • Nonlinearity Error (Typically 0.2% at 100 kHz)
  • Stable 150 ppm/°C Temperature Coefficient
  • Supply Voltage: 2.7 - 5.5 VDC
  • Operating Temperature range: -25 - 70 °C
  • Typical current draw: 2 mA
  • Output Frequency: 200 - 300 kHz

Downloads & Documentation

Product Specific Downloads
Download Details More Info
Light to Frequency TAOS in Medical Applications - 24.62 KB | updated: 21 Sep 2012 - 11:02 am
Light to Frequency TAOS Users Guide - 1.86 MB | updated: 21 Sep 2012 - 11:01 am
TSL235R Light to Frequency Datasheet - 171.23 KB | updated: 21 Sep 2012 - 10:59 am

Additional Resources