TSL25713 datasheet(5/39 Pages) OSRAM

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TSL2571 − Detailed Description

The TSL2571 light-to-digital device includes on-chip

photodiodes, integrating amplifiers, ADCs, accumulators,

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

interface. The device combines one photodiode (CH0), which is

responsive to both visible and infrared light, and one

photodiode (CH1), which is responsive primarily to infrared

light. 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.

This digital output can be read by a microprocessor through

which the illuminance (ambient light level) in lux is derived

using an empirical formula to approximate the human eye

response.

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 light intensity value. An interrupt is generated when

the value of an ALS 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.

Detailed Description

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