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PCA9533D/02 查看數據表(PDF) - Philips Electronics

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PCA9533D/02
Philips
Philips Electronics Philips
PCA9533D/02 Datasheet PDF : 18 Pages
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Philips Semiconductors
4-bit I2C LED dimmer
Product data sheet
PCA9533
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 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
Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
Packages offered: SO8, TSSOP8 (MSOP8)
DESCRIPTION
The PCA9533 is a 4-bit I2C 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 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 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. 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 1.69 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.
PIN CONFIGURATION
LED0 1
LED1 2
LED2 3
VSS 4
8 VDD
7 SDA
6 SCL
5 LED3
SW01035
Figure 1. Pin configuration
PIN DESCRIPTION
PIN
NUMBER
SYMBOL
1
LED0
2
LED1
3
LED2
4
VSS
5
LED3
6
SCL
7
SDA
8
VDD
FUNCTION
LED driver 0
LED driver 1
LED driver 2
Supply ground
LED driver 3
Serial clock line
Serial data line
Supply voltage
2004 Oct 01
2

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