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PCA9531 Datasheet 8-bit I2c Led Dimmer

Manufacturer: NXP Semiconductors

Overview: INTEGRATED CIRCUITS PCA9531 8-bit I2C LED dimmer Product data 2003 Nov 10 Philips Semiconductors Philips Semiconductors Product data 8-bit I2C LED dimmer.

General Description

The PCA9531 is an 8-bit I2C & SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications.

The PCA9531 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the output PWM.

The LED brightness is controlled by setting the blink rate high enough (> 100 Hz) that the blinking can not be seen and then using the duty cycle to vary the amount of time the LED is on and thus the average current through the LED.

Key Features

  • Eight LED drivers (on, off, flashing at a programmable rate).
  • Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.625 and 160 Hz (1.6 and 6.25 milliseconds).
  • 256 brightness steps.
  • Input/outputs not used as LED drivers can be used as regular GPIOs.
  • Internal oscillator requires no external components.
  • I2C interface logic compatible with SMBus.
  • Internal power-on reset.
  • Noise filter on SCL/SDA.

PCA9531 Distributor

More Datasheets from NXP Semiconductors

Part Number Description
PCA9532 16-bit I2C LED dimmer
PCA9533 4-bit I2C LED dimmer
PCA9534 8-bit I2C and SMBus/ low power I/O port
PCA9535 16-bit SMBus
PCA9535C 16-bit SMBus
PCA9536 4-bit I2C and SMBus I/O port
PCA9537 4-bit I2C and SMBus low power I/O port
PCA9538 8-bit I2C and SMBus low power I/O port
PCA9539 16-bit I2C and SMBus low power I/O port
PCA9539R 16-bit I2C and SMBus low power I/O port