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Part: PCA9533
Category:
Interface and Interconnect
-> I2C
Description: 4-bit I2C Led Dimmer<<<>>>the PCA9533 is a 4-bit i C 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 PCA9533 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.
Company: Philips Semiconductors
Datasheet: Download PCA9533 datasheet File size : 110 kB
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Datasheet text preview:
INTEGRATED CIRCUITS
PCA9533 4-bit I2C LED dimmer
Product data 2003 Sep 19
Philips Semiconductors
Philips Semiconductors
Product data
4-bit I2C LED dimmer
PCA9533
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.
FEATURES
· 4 LED drivers (on, off, flashing at a programmable rate) · 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.625 and 160 Hz (1.6 seconds and 6.25 milliseconds)
· 256 brightness steps · Input/outputs not used as LED drivers can be used as regular
GPIOs
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, pushbuttons, alarm monitoring, fans, etc. Power On Reset (POR) initializes the registers to their default state causing the bits to be set high (LED off). Due to pin limitations, the PCA9533 is not featured with hardware address pins. The PCA9533/01 and the PCA9533/02 have different fixed I2C addresses allowing operation of both on the same bus.
· Internal oscillator requires no external components · I2C interface logic compatible with SMBus · Internal power-on reset · Noise filter on SCL/SDA inputs · 4 open drain outputs directly drive LEDs to 25 mA · Edge rate control on outputs · No glitch on power-up · Supports hot insertion · Low stand-by current · Operating power supply voltage range of 2.3 V to 5.5 V · 0 to 400 kHz clock frequency · ESD protection exceeds 2000 V HBM per JESD22-A114,
150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
PIN CONFIGURATION
LED0 LED1 LED2 V SS
1 2 3 4
8 7 6 5
VDD SDA SCL LED3
SW01035
· Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
Figure 1. Pin configuration
· Packages offered: SO8, TSSOP8
DESCRIPTION
The PCA9533 is a 4-bit I@C & SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications. The PCA9533 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.
PIN 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
2003 Sep 19
2
Philips Semiconductors
Product data
4-bit I2C LED dimmer
PCA9533
ORDERING INFORMATION
PACKAGES 8-Pin Plastic SO 8-Pin Plastic SO 8-Pin Plastic TSSOP TEMPERATURE RANGE -40 to +85 °C -40 to +85 °C -40 to +85 °C ORDER CODE PCA9533D/01 PCA9533D/02 PCA9533DP/01 TOPSIDE MARK P9533/1 P9533/2 P33/1 DRAWING NUMBER SOT96-1 SOT96-1 SOT505-1 SOT505-1
8-Pin Plastic TSSOP -40 to +85 °C PCA9533DP/02 P33/2 Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging. I2C is a trademark of Philips Semiconductors Corporation.
BLOCK DIAGRAM
PCA9533
INPUT REGISTER
SCL INPUT FILTERS SDA
I 2C-BUS CONTROL
LED SELECT (LSx) REGISTER
0 1 LEDx VDD POWER-ON RESET PRESCALER 0 REGISTER OSCILLATOR PRESCALER 1 REGISTER PWM0 REGISTER PWM1 REGISTER BLINK0
BLINK1
V SS NOTE: ONLY ONE I/O SHOWN FOR CLARITY
SW02046
Figure 2. Block diagram
2003 Sep 19
3
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