TSL235R LIGHT TO FREQUENCY CONVERTER

TSL235R Light to Frequency Converter is a precision optical sensor that converts light intensity into a frequency output. It is widely used in ambient light sensing, optical instrumentation, and color measurement applications. The sensor outputs a square wave whose frequency is directly proportional to the incident light intensity, making it ideal for microcontroller interfacing and data acquisition systems.

Key Features:

• Direct Digital Output: Provides TTL-compatible square wave frequency signal proportional to light intensity.
• Wide Dynamic Range: Operates effectively from very low light to high-intensity light levels.
• Low Power Consumption: Ideal for battery-powered and energy-efficient designs.
• Temperature Stable: High linearity and minimal drift across operating temperatures.
• Simple Interface: No need for ADCs or complex signal conditioning circuits.

Technical Specifications:

• Output Type: Digital pulse (frequency output)
• Output Frequency Range: 0 Hz to >1 MHz (typical)
• Spectral Response: 320 nm to 1050 nm (peak at 700 nm)
• Supply Voltage: 2.7V to 5.5V
• Typical Supply Current: 2 mA
• Output Voltage Levels: TTL/CMOS compatible
• Operating Temperature: –25°C to +70°C

Mechanical Specifications:

• Package Type: 3-pin plastic through-hole (TO-92-style)
• Lead Spacing: Standard 2.54 mm (0.1 inch)
• Dimensions: Approx. 4.5 x 4.5 x 5.8 mm (body)

Pinout and Connections:

• Pin 1 (OUT): Frequency output signal (square wave)
• Pin 2 (GND): Ground connection
• Pin 3 (VDD): Supply voltage (2.7V to 5.5V)

Connection Diagram:

• Connect VDD to 5V or 3.3V supply
• Connect GND to ground
• Read frequency output from OUT using microcontroller input pin

Datasheet and Documentation:

• Download TSL235R Datasheet (PDF)

Applications:

• Ambient Light Sensing: Auto brightness control in LCDs and displays
• Color Detection Systems: Used with filters for RGB color measurement
• Light Meters: General-purpose optical instrumentation
• Solar Radiation Monitoring: Detect solar levels and spectrum variations
• Security Systems: Detect presence or object interruption via light change

Equivalent or Similar Parts:

• TSL230R: Programmable light-to-frequency converter with higher resolution
• VEML7700: Ambient light digital sensor with I2C interface
• APDS-9002: Analog light-to-voltage converter with similar spectral response

Package Includes:

• 1 x TSL235R Light to Frequency Converter