This breakout board is a color sensor based on TAOS TCS230 programmable color light to frequency converter which combines configurable silicon photodiodes and a current –to-frequency convertor on single monolithic CMOS integrated cicuit.
The light-to-frequency converter reads 8X8 array of photodiodes, each array could filter red, green, blue light or clear from light source via two control pins(S2,S3) and output a square wave(50% duty cycle) with frequency directly proportional to light intensity(irradiance). The full-scale output frequency can be scaled via two control input pin(S0,S1). Digital inputs and digital output allows direct interface to a microcontroller or other digital logic circuitry.
- High-Resolution Conversion of Light Intensity to Frequency
- Programmable Color and Full-Scale Output Frequency
- Communicates Directly With a Microcontroller
- Single-Supply Operation (2.7 V to 5.5 V)
- Power Down Feature
- Nonlinearity Error Typically 0.2% at 50 kHz
- Stable 200 ppm/°C Temperature Coefficient
- Low-Profile Surface-Mount Package
Pin definition and working principle
As we know, according to the RGB color model, a broad array colors is produced by red green and blue light added together in various ways. In other word, if we know the RGB data which constitutes different kind of color, we can get the certain color we test. With a certain color filter is selected(e.g red filter), TSC230 color sensor allows red light to get through alone and prevent other color green and blue light, so we can get the intensity of the red color. Blue and green light of intensity can be got in the same way.
TCS230 includes 8X8 array of photodiodes, 16 photodiodes have blue filters, 16 photodiodes have green filters, 16 photodiodes have green filters and 16 photodiodes are clear with no filters. With the different combination of S2 and S3, we can choose different type of color filter The full-scale output frequency can be scaled via two control input S0 and S1, by which we can output the different frequency coefficient (100%, 20%, 2%).