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PCA9531

NXP
Part Number PCA9531
Manufacturer NXP
Description 8-bit I2C LED dimmer
Published Mar 22, 2005
Detailed Description INTEGRATED CIRCUITS PCA9531 8-bit I2C LED dimmer Product data 2003 Nov 10 Philips Semiconductors Philips Semiconducto...
Datasheet PDF File PCA9531 PDF File

PCA9531
PCA9531

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 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.
From then on, only one command from the bus master is required to turn individual LEDs ON, OFF, BLINK RATE 1 or BLINK RATE 2.
Based on the programmed frequency and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the LEDs to appear at a different brightness or blink at periods up to 1.
6 second.
The open drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 100 mA per package.
To blink LEDs at periods greater than 1.
6 second the bus master (MCU, MPU, DSP, chipset, etc.
) must send repeated commands to turn the LED on and off as is currently done when using normal I/O Expanders like the Philips PCF8574 or PCA9554.
Any bits not used for controlling the LEDs can be used for General Purpose Parallel Input/Output (GPIO) expansion which provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, alarm monitoring, fans, etc.
The active low hardware reset pin (RESET) and Power On Reset (POR) initializes the registers to their default state causing the bits to be set high (LED off).
Three hardware address pins on the PCA9531 allow eight devices to operate on the same bus.
FEATURES • Eight LED drivers (on, o...


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