PCA9551 Philips Semiconductors, PCA9551 Datasheet - Page 2

• Manufacturer Part Number: PCA9551
• Description: 8-bit I2C LED driver with programmable blink rates
• Manufacturer: Philips Semiconductors

FEATURES
ORDERING INFORMATION
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
I
2
Philips Semiconductors
2004 Oct 01
C is a trademark of Philips Semiconductors Corporation.
8 LED drivers (on, off, flashing at a programmable rate)
2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.148 Hz and 38 Hz (6.74 and 0.026 seconds)
Input/outputs not used as LED drivers can be used as regular
GPIOs
Internal oscillator requires no external components
I
Internal power-on reset
Noise filter on SCL/SDA inputs
Active-LOW reset input
8 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 JESDEC Standard JESD78 which
exceeds 100 mA
Packages offered: SO16, TSSOP16, HVQFN16
8-bit I
programmable blink rates
2
16-pin plastic HVQFN
16-pin plastic TSSOP
C-bus interface logic compatible with SMBus
16-pin plastic SO
PACKAGES
2
C LED driver with
TEMPERATURE RANGE
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
ORDER CODE
PCA9551PW
PCA9551BS
PCA9551D
2
DESCRIPTION
The PCA9551 LED Blinker blinks LEDs in I
applications where it is necessary to limit bus traffic or free up the
I
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 I
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) for each individual output. 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.
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 PCA9551 allow eight devices
to operate on the same bus.
2
C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness
2
C-bus and uses up one of the master’s timers. The PCA9551
TOPSIDE MARK
PCA9551D
PCA9551
9551
DRAWING NUMBER
2
C-bus and SMBus
SOT109-1
SOT403-1
SOT629-1
Product data sheet
PCA9551