TSL238T

TSL238T High-Sensitivity Light-to-Frequency Converter The TSL238T 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 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm. The TSL238T is characterized for operation over the temperature range of -40C to 85C and is supplied in a compact 4-lead surface-mount package that is lead (Pb) free and RoHS compliant. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of TSL238T, High-Sensitivity Light-to-Frequency Converter are listed below: Figure 1: Added Value Of Using TSL238T Benefits Features Detects Light Intensity at a High Resolution 850K:1 Input Dynamic Range o Provides Low Light Level Operation Low Dark Frequency <6Hz at 50 C Reduces Board Space Requirements While 2.6mm x 3.8mm 4-Lead SMD (T) Package Simplifying Designs High-Resolution Conversion of Light Intensity to Frequency With No External Components 2 High Irradiance Responsivity 3.4kHz/(W/cm ) at =640nm p Single-Supply Operation 2.7 V to 5.5 V Stable 200 ppm/C Temperature Coefficient Interfaces Directly to a Microcontroller ams Datasheet Page 1 v1-00 2016-May-25 Document FeedbackT S L2 38T Gen e ra l De s c rip t ion Functional Block Diagram The functional blocks of this device are shown below: Figure 2: TSL238T Block Diagram Current-to-Frequency Light Photodiode Output Converter Page 2 ams Datasheet Document Feedback v1-00 2016-May-25