PCA9957 Datasheet PDF (24-channel SPI serial bus 32mA/5.5V constant current LED driver)

PCA9957 - 24-channel SPI serial bus 32mA/5.5V constant current LED driver

Datasheet Summary

Description

The PCA9957 is a daisy-chain SPI-compatible 4-wire serial bus controlled 24-channel constant current LED driver optimized for dimming and blinking 32 mA Red/Green/Blue/Amber (RGBA) LEDs.

Features

24 LED drivers. Each output programmable at:.
Off.
On.
8 bits programmable LED brightness.
8 bits 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 be assigned to one of six gradation control groups.
Programmable gradation time and rate for ramp-up and/or ramp-down operations.
Programmable step time (6-bit).

Datasheet Details

Part number	PCA9957
Manufacturer	NXP
File Size	753.14 KB
Description	24-channel SPI serial bus 32mA/5.5V constant current LED driver
Datasheet	PCA9957 Datasheet
Additional preview pages of the PCA9957 datasheet.

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Full PDF Text Transcription

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PCA9957 24-channel SPI serial bus 32 mA/5.5 V constant current LED driver Rev. 1 — 24 October 2019 Product data sheet 1. General description The PCA9957 is a daisy-chain SPI-compatible 4-wire serial bus controlled 24-channel constant current LED driver optimized for dimming and blinking 32 mA Red/Green/Blue/Amber (RGBA) LEDs. 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.

Published: Apr 2, 2020 |