TSL237 Light-to-Frequency Converter
TSL237 Light-to-Frequency ConverterTSL237 Light-to-Frequency Converter
TSL237 Light-to-Frequency Converter

TSL237 Light-to-Frequency Converter

Manufacturer: Parallax
Product Code: Sensors-Light-TSL237_604-00085
Weight:0.25 lb
Reward Points:0
In Stock
Price: $2.99

TSL237 Light-to-Frequency Converter.Light spectrum detail.

The TSL237 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 (Note that the TSL235R/TSL237R differ only in their output frequency range).

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.


  • 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: 40 - 60 kHz.

NOTES: 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.

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