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TSL235R Light to frequency converter


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.


  • 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


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

Suggested Applications:

  • Camera exposure
  • Dimming displays
  • Machine vision Key
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  WARNING: This product can expose you to chemicals including DEHP which is known to the State of California to cause cancer and to cause birth defects or other reproductive harm. For more information go to: