TSL238D-TR ams

TSL238 High-Sensitivity Light-to-Frequency Converter The TSL238 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 TSL238 is characterized for operation over the temperature range of -40C to 85C and is supplied in an 8-lead plastic small outline package. When supplied in the lead (Pb) free package, the device is RoHS compliant. For automotive and other extended temperature applications, please contact ams for information. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of TSL238, High-Sensitivity Light-to-Frequency Converter are listed below: Figure 1: Added Value of Using TSL238 Benefits Features Detects Light Intensity at a High Resolution 850000:1 Input Dynamic Range Provides Low Light Level Operation Low Dark Frequency < 2 Hz at 25C Reduces Board Space Requirements while 5mm x 6.2mm SOIC (D) Package Simplifying Designs High-Resolution Conversion of Light Intensity to Frequency with No External Components 2 High Irradiance Responsivity: 2.3kHz/(mW/cm ) = 524 nm p Single-Supply Operation: 2.7 V to 5.5 V Stable 200 ppm/C Temperature Coefficient Interfaces Directly to a Microcontroller Lead (Pb) Free Package, RoHS Compliant ams Datasheet Page 1 v1-00 2016-Aug-30 Document FeedbackTS L 2 3 8 G e n e ral D e sc r i ption Block Diagram The functional blocks of this device are shown below: Figure 2: TSL238 Block Diagram Current-to-Frequency Light Photodiode Output Converter Page 2 ams Datasheet Document Feedback v1-00 2016-Aug-30