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PCA9955A Datasheet 16-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver

Manufacturer: NXP Semiconductors

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General Description

The PCA9955A is an I2C-bus controlled 16-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 100 % 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

PCA9955A 16-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver Rev.

3 — 14 October 2014 Product data sheet 1.

Key Features

  • 16 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.
  • Gradation control for all channels.
  • Each channel can assign to one of four gradation control groups.
  • Programmable gradation time and rate for ramp-up and/or ramp-down operations.
  • Programmable step time (6-bit) from 0.5 ms (mini.

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