TCS34717FN datasheet(15/39 Pages) OSRAM

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[v1-01] 2018-Mar-27

TCS3471 − Principles O f Operation

RGBC Operation

The RGBC engine contains RGBC gain control (AGAIN) and four

integrating analog-to-digital converters (ADC) for the RGBC

photodiodes. The RGBC integration time (ATIME) impacts both

the resolution and the sensitivity of the RGBC reading.

Integration of all four channels occurs simultaneously and upon

completion of the conversion cycle, the results are transferred

to the color data registers. This data is also referred to as channel

count.

The transfers are double-buffered to ensure that invalid data is

not read during the transfer. After the transfer, the device

automatically moves to the next state in accordance with the

configured state machine.

Figure 18:

RGBC Operation

The registers for programming the integration and wait times

are a 2’s compliment values. The actual time can be calculated

as follows:

ATIME = 256 - Integration Time / 2.4 ms

Inversely, the time can be calculated from the register value as

follows:

Integration Time = 2.4 ms

× (256 - ATIME)

For example, if a 100ms integration time is needed, the device

needs to be programmed to:

256 - (100 / 2.4) = 256 - 42 = 214 = 0xD6

Conversely, the programmed value of 0xC0 would correspond

to:

(256 - 0xC0)

× 2.4 = 64 × 2.4 = 154 ms.

AGAIN(r 0x0F, b1:0)

y, 4y, 16y, 60y Gain

CDATAH(r 0x15), CDATA(r 0x14)

Clear ADC

Red ADC

Green ADC

Blue ADC

Clear Data

Red Data

Green Data

Blue Data

RGBC Control

Blue

Green

Red

Clear

RDATAH(r 0x17), RDATA(r 0x16)

GDATAH(r 0x19), GDATA(r 0x18)

BDATAH(r 0x1B), BDATA(r 0x1A)

ATIME(r 1)

2.4 ms to 700 ms

(EQ1)

(EQ2)

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