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PCA9533 - 4-bit I2C LED dimmer

Description

PIN NUMBER 1 2 3 4 5 6 7 8 SYMBOL LED0 LED1 LED2 VSS LED3 SCL SDA VDD FUNCTION LED driver 0 LED driver 1 LED driver 2 Supply ground LED driver 3 Serial clock line Serial data line Supply voltage Packages offered: SO8, TSSOP8 (MSOP8) DESCRIPTION The PCA9533 is a 4-bit I2C and SMBus I/O exp

Features

  • 4 LED drivers (on, off, flashing at a programmable rate).
  • 2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.591 Hz and 152 Hz (1.69 seconds and 6.58 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 S.

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Datasheet preview – PCA9533

Datasheet Details

Part number PCA9533
Manufacturer NXP Semiconductors
File Size 122.30 KB
Description 4-bit I2C LED dimmer
Datasheet download datasheet PCA9533 Datasheet
Additional preview pages of the PCA9533 datasheet.

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Full PDF Text Transcription

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INTEGRATED CIRCUITS PCA9533 4-bit I2C LED dimmer Product data sheet Supersedes data of 2003 Sep 19 2004 Oct 01 Philips Semiconductors Philips Semiconductors Product data sheet 4-bit I2C LED dimmer PCA9533 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 1.69 second.
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