TSL230BRD

The TSL230RD, TSL230ARD, and TSL230BRD programmable light-to-frequency converters combine a configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated circuit. The output can be either a pulse train or a square wave (50% duty cycle) with frequency directly proportional to light intensity. Device sensitivity is selectable in three ranges, providing two decades of adjustment. The full-scale output frequency can be scaled by one of four preset values. All inputs and the output are TTL compatible, allowing direct two-way communication with a microcontroller for programming and output interface. The output enable (OE) places the output in the high-impedance state for multiple-unit sharing of a microcontroller input line.

The devices are available with absolute output frequency tolerances of ±10% (TSL230BRD), ±15% (TSL230ARD), and ±20% (TSL230RD). They have been temperature compensated for the ultraviolet-to-visible light range of 320 nm to 700 nm and respond over the light range of 320 nm to 1050 nm. The devices are characterized over the temperature range of −25 to 70.