Datasheet

PCA9674_PCA9674A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 7 — 30 May 2013 4 of 40
NXP Semiconductors
PCA9674; PCA9674A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
5. Block diagram
Fig 1. Block diagram of PCA9674; PCA9674A
Fig 2. Simplified schematic diagram of P0 to P7
002aac108
INT
I
2
C-BUS
CONTROL
PCA9674
PCA9674A
LP FILTER
AD0
AD1
AD2
INPUT
FILTER
SHIFT
REGISTER
SDA
SCL
8 BITS
write pulse
read pulse
POWER-ON
RESET
V
DD
V
SS
I/O
PORT
P0 to P7
INTERRUPT
LOGIC
002aah566
write pulse
read pulse
D
CI
S
FF
Q
power-on reset
data from Shift Register
I
trt(pu)
100 µA
I
OH
I
OL
V
DD
P0 to P7
V
SS
D
CI
S
FF
Q
data to Shift Register
to interrupt logic