TSL26711FN datasheet(5/45 Pages) OSRAM

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TSL2671 − Detailed Description

The TSL2671 light-to-digital device provides on-chip

photodiodes, integrating amplifiers, ADCs, accumulators,

clocks, buffers, comparators, a state machine, and an I²C

interface. Each device combines a Channel 0 photodiode (CH0),

which is responsive to both visible and infrared light, and a

channel 1 photodiode (CH1), which is responsive primarily to

infrared light. Proximity detection can occur using either or

both photodiodes. Two integrating ADCs simultaneously

convert the amplified photodiode currents into 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.

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 16-

μs period. This LED current, coupled with

the programmable number of pulses, provides a 2000:1

contiguous dynamic range.

Communication to 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 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 proximity value. An interrupt is generated when the

value of a 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.

Detailed Description

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