TSL25911FN datasheet(4/34 Pages) OSRAM

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Datasheet, Public

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[v3-00] 2023-Feb-08

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TSL2591 − Detailed Description

The TSL2591 contains two integrating analog-to-digital

converters (ADC) that integrate currents from two photodiodes.

Integration of both channels occurs simultaneously. Upon

completion of the conversion cycle, the conversion result is

transferred to the Channel 0 and Channel 1 data registers,

respectively. The transfers are double-buffered to ensure that

the integrity of the data is maintained. After the transfer, the

device automatically begins the next integration cycle.

Communication with the device is accomplished through a

standard, two-wire I²C serial bus. Consequently, the TSL2591

can be easily connected to a microcontroller or embedded

controller. No external circuitry is required for signal

conditioning. Because the output of the device is digital, the

output is effectively immune to noise when compared to an

analog signal.

The TSL2591 also supports an interrupt feature that simplifies

and improves system efficiency by eliminating the need to poll

a sensor for a light intensity value. The primary purpose of the

interrupt function is to detect a meaningful change in light

intensity. The concept of a meaningful change can be defined

by the user both in terms of light intensity and time, or

persistence, of that change in intensity. The device has the

ability to define two sets of thresholds, both above and below

the current light level. An interrupt is generated when the value

of a conversion exceeds either of these limits. One set of

thresholds can be configured to trigger an interrupt only when

the ambient light exceeds them for a configurable amount of

time (persistence) while the other set can be configured to

trigger an immediate interrupt.

Detailed Description

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