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PCA9956B Datasheet LED driver

Manufacturer: NXP Semiconductors

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General Description

The PCA9956B is an I2C-bus controlled 24-channel constant current LED driver optimized for dimming and blinking 57 mA Red/Green/Blue/Amber (RGBA) LEDs in amusement products.

Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 31.25 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value.

An additional 8-bit resolution (256 steps) group PWM controller has both a fixed frequency of 122 Hz and an adjustable frequency between 15 Hz to once every 16.8 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all LEDs with the same value.

Overview

PCA9956B 24-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver Rev.

1.2 — 10 June 2020 Product data sheet 1.

Key Features

  • PCA9956B Product data sheet.
  • 24 LED drivers. Each output programmable at:.
  • Off.
  • On.
  • Programmable LED brightness.
  • Programmable group dimming/blinking mixed with individual LED brightness.
  • Programmable LED output delay to reduce EMI and surge currents.
  • 24 constant current output channels can sink up to 57 mA, tolerate up to 20 V when OFF.
  • Output current adjusted through an external resistor (Rext input).
  • Output current accuracy.
  • 4 % between outp.

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