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PCA9531 - 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.

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.

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Other Datasheets by NXP Semiconductors

Part Number Description
PCA9532 16-bit I2C LED dimmer
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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INTEGRATED CIRCUITS PCA9531 8-bit I2C LED dimmer Product data 2003 Nov 10 Philips Semiconductors Philips Semiconductors Product data 8-bit I2C LED dimmer PCA9531 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. The initial setup sequence programs the two blink rates/duty cycles for each individual PWM.