DatasheetsPDF.com

PCA9532

NXP
Part Number PCA9532
Manufacturer NXP
Description 16-bit I2C LED dimmer
Published Mar 22, 2005
Detailed Description INTEGRATED CIRCUITS PCA9532 16-bit I2C LED dimmer Product data Supersedes data of 2003 Feb 26 2003 May 02 Philips Semi...
Datasheet PDF File PCA9532 PDF File

PCA9532
PCA9532

Overview
INTEGRATED CIRCUITS PCA9532 16-bit I2C LED dimmer Product data Supersedes data of 2003 Feb 26 2003 May 02 Philips Semiconductors Philips Semiconductors Product data 16-bit I2C LED dimmer PCA9532 DESCRIPTION The PCA9532 is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications.
The PCA9532 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 cannot 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 set-up 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 seconds.
The open drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 200 mA per package (100 mA per octal).
To blink LEDs at periods greater than 1.
6 seconds 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 PCF8575 or PCA9555.
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, pushbuttons, alarm monitoring, fans, etc.
The active-LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).
Three hardware address pins on the PCA9532 allow eight d...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)