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PCA9901 Datasheet One Wire Single LED Driver

Manufacturer: NXP Semiconductors

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General Description

The PCA9901 is a 20 mA current source for a single LED that allows stand-alone blinking of a predefined pattern to off-load the microcontroller and save battery power.

Programming of the device is done through a training sequence: the host controller sends the LED lighting sequence and the PCA9901 memorizes it.

Once the sequence has been memorized, the PCA9901 can be programmed to send it once or in a loop until the host controller requests the sequence to be stopped.

Overview

PCA9901 One wire single LED driver Rev.

2 — 2 September 2010 Product data sheet 1.

Key Features

  • 1 wire interface to control the device.
  • Stand-alone blinking capability while training the sequence to blink.
  • Sequence includes up to 3 blinking elements.
  • 12-bit (4096 steps) LED ON and OFF timings for each blinking element: ‹ ON timing is captured between 1 ms and 255 ms ‹ OFF timing is captured between 20 ms and 5.1 s.
  • 1.8 V compliant one-wire logic interface.
  • Training Start, Training End, Run-Once, Run, Stop and Reset commands.
  • H.

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