TMD37827 datasheet(3/34 Pages) AMSCO

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Datasheet - Mar. 2013 - V2

TMD3782 – 3

The TMD3782 is a digital color light sensor device containing

four analog-to-digital converters (ADCs) that integrate currents

from photodiodes. Multiple photodiode segments for red, green,

blue, and clear are geometrically arranged to reduce the reading

variance as a function of the incident light angle. Integration of

all color sensing channels occurs simultaneously. Upon

completion of the conversion cycle, the 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 I

2C serial bus for easy connection to

a microcontroller or embedded controller.

The TMD3782 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 a clear channel or proximity conversion

equals or exceeds either an upper or lower threshold. In

addition, a programmable interrupt persistence feature allows

the user to determine how many consecutive s a m p l e s m u s t

e q u a l o r exceed the threshold to trigger an interrupt.

Interrupt thresholds and persistence settings are configured

independently for both the clear channel and proximitysensors.

Proximity detection is done using a dedicated proximity

photodiode centrally located beneath an internal lens, an internal

LED, and a driver circuit. The driver circuit requires no external

components and is trimmed to provide a calibrated proximity

response. Customer calibrations are usually not required. The

number of proximity LED pulses can be programmed from 1 to 255

pulses, providing a 2000:1 contiguous dynamic range.

Background ambient light is subtracted from the proximity

reading to improve accuracy in all lighting conditions.

A state machine controls the functionality. Enabling bits

independently determine whether the Proximity, Wait or RGBC

/ ALS functions are performed. Average power consumption is

managed via control of variable endurance low power wait

cycles. Once initiated the state machine will run continuously

until disabled.

Detailed Description

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