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| PCA9554 Datasheet, PDF (3/30 Pages) NXP Semiconductors – 8-bit I2C and SMBus I/O port with interrupt | |||
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NXP Semiconductors
4. Block diagram
PCA9554/PCA9554A
8-bit I2C-bus and SMBus I/O port with interrupt
PCA9554/PCA9554A
A0
A1
A2
SCL
SDA
INPUT
FILTER
VDD
VSS
POWER-ON
RESET
I2C-BUS/SMBus
CONTROL
8-bit
write pulse
read pulse
INPUT/
OUTPUT
PORTS
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
VDD
LP
FILTER
INT
002aac492
All I/Os are set to inputs at reset.
Fig 1. Block diagram of PCA9554/PCA9554A
PCA9554_9554A_7
Product data sheet
Rev. 07 â 13 November 2006
© NXP B.V. 2006. All rights reserved.
3 of 30
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