TCS3772 datasheet(16/51 Pages) OSRAM

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ams Datasheet

Page 15

[v1-01] 2018-Mar-14

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TCS3772 − Detailed Description

The TCS3772 is a next-generation digital color light sensor

device containing four integrating analog-to-digital converters

(ADCs) that integrate currents from photodiodes. The device

contains a 3 × 4 photodiode array used for color measurements

and a 1 × 4 photodiode array used for proximity measurements.

Integration of all color sensing channels occurs simultaneously.

Upon completion of the conversion cycle, the conversion result

is transferred to the corresponding data registers. The transfers

are double-buffered to ensure that the integrity of the data is

maintained. Communication with the device is accomplished

through a fast (up to 400 kHz), two-wire I2C serial bus for easy

connection to a microcontroller or embedded controller.

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

interrupt feature simplifies and improves system efficiency by

eliminating the need to poll a sensor for a light intensity value.

When interrupts are enabled, an interrupt is generated when

the value of a clear channel or proximity conversion is greater

than an upper threshold or less than a lower threshold. Once

the interrupt is asserted, it remains asserted until cleared by the

controlling firmware. In addition, a programmable interrupt

persistence filter allows the user to set the number of

consecutive clear channel or proximity conversions outside of

the threshold region that are necessary to trigger an interrupt.

Interrupt thresholds and persistence filter settings are

configured independently for both clear 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 12.5 mA, 25 mA, 50 mA, or 100 mA 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 14-

μs period.

Detailed Description

TCS3772 Datasheet(PDF) 16 Page - OSRAM GmbH