TSL26725(2016) 查看數據表（PDF） - austriamicrosystems AG

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产品描述 (功能)

生产厂家

TSL26725
(Rev.:2016)

Digital Proximity Detector

austriamicrosystems AG 

TSL2672 − Detailed Description

Detailed Description

Proximity detection requires only a single external LED. This

external LED is driven by an internal LED current driver, which

pulses the LED with current for approximately 7 microseconds.

The number of pulses, from 1 to 255, and the current level, from

1.9 mA to 120 mA, can be programmed and together provide a

16,000:1 contiguous dynamic range. Because the driver is a

constant current sink, no external current limiting resistor is

required to protect the LED.

In addition to the internal LED current driver, the TSL2672

proximity detector provides ON-chip photodiodes, oscillator,

integrating amplifier, ADC, state machine controller,

programmable interrupt and I²C interface to provide a

complete proximity detection solution.

Each device has two photodiodes; a channel 0 photodiode

(CH0), which is responsive to both visible and infrared light, and

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

only infrared light. The user selects the appropriate diode for

their application.

The integrating amplifier and ADC converts the selected

photodiode current into a digital value providing up to 16 bits

of resolution. Upon completion of a proximity conversion cycle,

the result is transferred to the proximity data registers where it

is available to be read.

Communication with the device is accomplished over 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 noise-immune when compared

to an analog interface.

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

simplify and improve system efficiency by eliminating the need

to poll for proximity data. When interrupts are enabled, an

interrupt is generated when the proximity data either exceeds

an upper threshold or is less than a lower threshold. Once

generated, the interrupt remains asserted until cleared by the

controlling firmware. In addition, a programmable interrupt

persistence filter allows the user to determine the number of

consecutive out-of-range measurements necessary to trigger

an interrupt.

ams Datasheet

[v1-00] 2016-Mar-23

Page 5

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