TCS37715FN datasheet(5/49 Pages) OSRAM

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[v1-31] 2018-Apr-04

TCS3771 − Detailed Description

The TCS3771 light-to-digital device contains a 4 × 4 photodiode

array, integrating amplifiers, ADCs, accumulators, clocks,

buffers, comparators, a state machine, and an I2C interface. The

4 × 4 photodiode array is composed of red-filtered,

green-filtered, blue-filtered, and clear photodiodes - four of

each type. Four integrating ADCs simultaneously convert the

amplified photodiode currents to a digital value providing up

to 16 bits of resolution. Upon completion of the conversion

cycle, the conversion result is transferred to the data registers.

The transfers are double-buffered to ensure that the integrity

of the data is maintained. Communication to the device is

accomplished through a fast (up to 400kHz), two-wire I2C serial

bus for easy connection to a microcontroller or embedded

controller.

The TCS3771 provides a separate pin for level-style interrupts.

When interrupts are enabled and a preset value is exceeded,

the interrupt pin is asserted and remains asserted until cleared

by the controlling firmware. The interrupt feature simplifies and

improves system efficiency by eliminating the need to poll a

sensor for a light intensity or proximity value. An interrupt is

generated when the value of an RGBC or proximity conversion

exceeds either an upper or lower threshold. In addition, a

programmable interrupt persistence feature allows the user to

determine how many consecutive exceeded thresholds are

necessary to trigger an interrupt. Interrupt thresholds and

persistence settings are configured independently for both

RGBC and proximity.

Proximity detection requires only a single external IR LED. An

internal LED driver can be configured to provide a constant

current sink of 12.5mA, 25mA, 50mA or 100mA of current. No

external current limiting resistor is required. The number of

proximity LED pulses can be programmed from 1 to 255 pulses.

Each pulse has a 14μs period. This LED current coupled with the

programmable number of pulses provides a 2000:1 contiguous

dynamic range.

Detailed Description

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