TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E SEPTEMBER 2007 PACKAGE S PACKAGE SM High-Resolution Conversion of Light SIDELOOKER SURFACE MOUNT Intensity to Frequency With No External (FRONT VIEW) SIDELOOKER Components (FRONT VIEW) Communicates Directly With a Microcontroller Compact Three-Leaded Clear-Plastic Package Single-Supply Operation Down to 2.7 V Nonlinearity Error Typically 0.2% at 100 kHz Stable 150 ppm/C Temperature Coefficient Single-Supply Operation RoHS Compliant (LF Package Only) 1 2 3 GND V OUT DD 1 2 3 GND V OUT DD Description The TSL235R light-to-frequency converter combines a silicon 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 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm. The TSL235R is characterized for operation over the temperature range of 25C to 70C 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. Functional Block Diagram Current-to-Frequency Light Photodiode Output Converter Available Options DEVICE T PACKAGE LEADS PACKAGE DESIGNATOR ORDERING NUMBER A TSL235R 25C to 70C 3-lead Sidelooker S TSL235R TSL235R 25C to 70C 3-lead SidelookerLead (Pb) Free S TSL235R LF TSL235R 25C to 70C 3-lead Surface-Mount SidelookerLead (Pb) Free SM TSL235RSM LF Terminal Functions TERMINAL TYPETYPE DESCRIPTIONDESCRIPTION NAME NO. GND 1 Power supply ground (substrate). All voltages are referenced to GND. OUT 3 O Output frequency. V 2 Supply voltage. DD Copyright 2007, TAOS Inc. The LUMENOLOGY Company Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road Suite 300 Plano, TX 75074 (972) 673-0759 www.taosinc.com 1TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E SEPTEMBER 2007 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, V (see Note 1) . 6 V DD Operating free-air temperature range, T 25C to 70C A Storage temperature range, T 25C to 85C stg Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds (S Package) 260C Reflow solder, in accordance with J-STD-020C or J-STD-020D (SM Package) . 260C Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to GND. Recommended Operating Conditions MIN NOM MAX UNIT Supply voltage, V 2.7 5 5.5 V DD Operating free-air temperature range, T 25 70 C A Electrical Characteristics at V = 5 V, T = 25C (unless otherwise noted) DD A PARAMETER TEST CONDITIONS MIN TYP MAX UNIT V High-level output voltage I = 4 mA 4 4.5 V OH OH V Low-level output voltage I = 4 mA 0.25 0.4 V OL OL I Supply current 2 3 mA DD Full-scale frequency 500 kHz Temperature coefficient of output frequency Wavelength < 700nm 150 ppm/C k Supply-voltage sensitivity V = 5 V 10% 0.5 %/V SVS DD Full-scale frequency is the maximum operating frequency of the device without saturation. Operating Characteristics at V = 5 V, T = 25C DD A PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 2 E = 430 W/cm , = 635 nm 200 250 300 kHz e p ff Output frequencyOutput frequency O 2 E = 0 W/cm 0.4 10 Hz e f = 0 kHz to 10 kHz 0.1% %F.S. O NonlinearityNli it f = 0 kHz to 100 kHz 0.2% %F.S. O 1 pulse of new Step response to full-scale step input frequency plus 1 s Full-scale frequency is the maximum operating frequency of the device without saturation. Nonlinearity is defined as the deviation of f from a straight line between zero and full scale, expressed as a percent of full scale. O Copyright 2007, TAOS Inc. The LUMENOLOGY Company 2 www.taosinc.com