TSL237T ams

TSL237T High-Sensitivity Light-to-Frequency Converter The TSL237 light-to-frequency converter combines a silicon General Description photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit. Output is a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance) on the photodiode. The digital output allows direct interface to a microcontroller or other logic circuitry. Output enable (OE) places the output in a high-impedance state for multiple-unit sharing of a microcontroller input line. The device has been temperature compensated for the ultraviolet-to-visible light range of 320nm to 700nm and responds over the light range of 320nm to 1050nm. The TSL237 is characterized for operation over the temperature range of -40C to 85C and is supplied in a compact 4-lead surface-mount package (T). Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of the TSL237, High Sensitivity Light-to-Frequency Converter, are listed below: Figure 1: Added Value of Using TSL237 Benefits Features High-Resolution Conversion of Light Intensity 5M:1 Input Dynamic Range to Frequency with no External Components Provides Low Light Level Operation Low Dark Frequency of 0.1 Hz (typical), <2Hz at 50C 2 Provides for High Sensitivity to Detect a Small High Irradiance Responsivity 1.2kHz/(W/cm ) Change in Light p = 640nm Reduces Board Space Requirements while 2.6mm x 3.8mm 4-lead SMD (T) Package Simplifying Designs Single-Supply Operation: 2.7V to 5.5V Stable 200ppm/C Temperature Coefficient Communicates Directly with a Microcontroller ams Datasheet Page 1 v1-01 2018-Apr-04 Document FeedbackT S L2 37T Gen e ra l De s c rip t ion Block Diagram The functional blocks of this device are shown below: Figure 2: TSL237 Block Diagram Current-to-Frequency Light Photodiode Output Converter OE Page 2 ams Datasheet Document Feedback v1-01 2018-Apr-04