TSL235R Light To Frequency Converter

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.

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

Applications

• Camera exposure
• Dimming displays
• Machine vision

Specifications

• Nonlinearity Error: (Typically 0.2% at 100 kHz)
• Stable 150ppm/° 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

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.

Downloads & Resources

• TSL235R Datasheet (.pdf)
• Getting Started Guide (.pdf)
• Uses for LTF Devices (.pdf)
• Link to TSL230 Arduino Setup

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