PCA9553D/02 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
PCA9553D/02 Datasheet PDF : 18 Pages
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Philips Semiconductors
4-bit I2C LED driver with
programmable blink rates
Product data sheet
PCA9553
FEATURES
• 4 LED drivers (on, off, flashing at a programmable rate)
• 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.172 Hz and 44 Hz (5.82 and 0.023 seconds)
• Input/outputs not used as LED drivers can be used as regular
GPIOs
• Internal oscillator requires no external components
• I2C-businterface logic compatible with SMBus
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• 4 open drain outputs directly drive LEDs to 25 mA
• Controlled edge rates to minimize ground bounce
• 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 PCA9553 LED Blinker blinks LEDs in I2C and SMBus
applications where it is necessary to limit bus traffic or free up the
I2C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness
of this device is the internal oscillator with two programmable blink
rates. To blink LEDs using normal I/O Expanders like the PCF8574
or PCA9554, the bus master must send repeated commands to turn
the LED on and off. This greatly increases the amount of traffic on
the I2C-bus and uses up one of the master’s timers. The PCA9553
LED Blinker instead requires only the initial set-up command to
program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and
duty cycle). From then on, only one command from the bus master
is required to turn each individual open drain output ON, OFF, or to
cycle at BLINK RATE 1 or BLINK RATE 2. Maximum output sink
current is 25 mA per bit and 100 mA per package.
Any bits not used for controlling the LEDs can be used for General
Purpose Parallel Input/Output (GPIO) expansion.
Power-On Reset (POR) initializes the registers to their default state,
all zeroes, causing the bits to be set HIGH (LED off).
Due to pin limitations, the PCA9553 is not featured with hardware
address pins. The PCA9553/01 and the PCA9553/02 have different
fixed I2C-bus 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
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
TOPSIDE MARK
DRAWING NUMBER
8-Pin Plastic SO
–40 °C to +85 °C
PCA9553D/01
P9553/1
8-Pin Plastic SO
–40 °C to +85 °C
PCA9553D/02
P9553/2
8-Pin Plastic TSSOP (MSOP)
–40 °C to +85 °C
PCA9553DP/01
P53/1
8-Pin Plastic TSSOP (MSOP)
–40 °C to +85 °C
PCA9553DP/02
P53/2
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
I2C is a trademark of Philips Semiconductors Corporation.
SOT96-1
SOT96-1
SOT505-1
SOT505-1
2004 Oct 01
2
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