TSL237S-LF

TSL237 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. 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 3-lead clear plastic side-looker package with an integral lens. 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 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 to 5M:1 Input Dynamic Range Frequency with No External Components Provides Low Light Level Operation Low Dark Frequency of 0.1 Hz (typical) High Irradiance Responsivity Provides for High Sensitivity to Detect a Small 2 Change in Light 2.3kHz/(W/cm ) p = 524nm Provides Additional Sensitivity Advantages 2x Gain Lens Low Dark Frequency: < 2Hz at 50C Single-Supply Operation: 2.7V to 5.5V Stable 200ppm/C Temperature Coefficient Interfaces Directly to a Microcontroller RoHS Compliant (-LF Package Only) ams Datasheet Page 1 v1-01 2018-Mar-27 Document FeedbackTS L 2 3 7 Gene ral Des c rip t ion Functional Block Diagram The functional blocks of this device are shown below: Figure 2: TSL237 Block Diagram Current-to-Frequency Light Photodiode Output Converter Page 2 ams Datasheet Document Feedback v1-01 2018-Mar-27