Description

TCS3200D-TR Colour Sensor IC

The TCS3200 programmable color light-to-frequency converters that combine configurable silicon photo-diodes and a current-to-frequency converter on a single monolithic CMOS integrated circuit. The output is a square wave (50% duty cycle) with Frequency directly proportional to light intensity (irradiance).

The full-scale output frequency can be scaled by one of three preset values via two control input pins. Digital inputs and digital output allow direct interface to a microcontroller or other logic circuitry. Output enable (OE) places the output in the high-impedance state for multiple-unit sharing of a microcontroller input line.

In the TCS3200, the light-to-frequency converter reads an 8 x 8 array of photo-diodes. Sixteen photo-diodes have blue filters, 16 photo-diodes have green filters, 16 photo-diodes have red filters, and 16 photo-diodes are clear with no filters.

The four types (colors) of photo-diodes are interdigitated to minimize the effect of non-uniformity of incident irradiance. All photo-diodes of the same color are connected in parallel. Pins S2 and S3 are used to select which group of photo-diodes (red, green, blue, clear) are active. Photo-diodes are 110 μm x 110 μm in size and are on 134-μm centers.