Peak Wavelength
:
Operating Supply Voltage
:
Supply Current
:
Maximum Operating Temperature
: + 85 C
Packaging
: Reel
Minimum Operating Temperature
: - 40 C
Mounting Style
: SMD/SMT
Package / Case
: SMD
Features: ` High-Resolution Conversion of Light Intensity to Frequency With No External Components
` High Irradiance Responsivity . . .
1.2 kHz/(W/cm2) at p = 640 nm
` Low Dark Frequency . . . < 2 Hz at 50
` Single-Supply Operation . . . 2.7 V to 5.5 V
` Stable 200 ppm/Temperature Coefficient
` Communicates Directly with a Microcontroller
` RoHS CompliantSpecificationsSupply voltage, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Input voltage range, OE input, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .... . −0.3 V to VDD + 0.3 V
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . ............. . . −40 to 85
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to 85
Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature . . . . . . . . . 260
† 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.
DescriptionThe TSL237T 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. 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 TSL237T is characterized for operation over the temperature range of −40 to 85 and is supplied in a compact 4-lead surface-mount package.
TSL237T Data Sheet
