TMD27721 datasheet(17/60 Pages) OSRAM

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[v1-21] 2016-Feb-16

TMD2772/ TMD2772WA − Detailed Description

reading at a specified distance with a specific number of pulses.

In use, the number of proximity LED pulses can be programmed

from 1 to 255 pulses, which allows different proximity distances

to be achieved. Each pulse has a 16 μs period with a 7.2 μs on

time.

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 digital output of

the device is inherently more immune to noise when compared

to an analog photodiode interface.

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

When interrupts are enabled and a pre-set 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 ALS 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 ALS

and proximity.

TMD27721 датащи(PDF) 17 Page - OSRAM GmbH