pca9674a NXP Semiconductors, pca9674a Datasheet - Page 3

• Manufacturer Part Number: pca9674a
• Description: Remote 8-bit I/o Expander For Fm+ I2c-bus With Interrupt
• Manufacturer: NXP Semiconductors

NXP Semiconductors
5. Block diagram
Product data sheet
PCA9674_PCA9674A_2
Fig 1. Block diagram of PCA9674/74A
Fig 2. Simplified schematic diagram of P0 to P7
SDA
AD0
AD1
AD2
SCL
V
V
data from Shift Register
INT
DD
SS
data to Shift Register
power-on reset
PCA9674
PCA9674A
write pulse
read pulse
FILTER
INPUT
POWER-ON
Rev. 02 — 12 October 2006
RESET
INTERRUPT
Remote 8-bit I/O expander for Fm+ I
LOGIC
CONTROL
D
CI
I
2
C-BUS
FF
S
Q
D
CI
REGISTER
FF
write pulse
read pulse
S
SHIFT
Q
I
trt(pu)
LP FILTER
8 BITS
100 A
PCA9674/74A
I
I
OH
OL
PORT
I/O
002aac109
002aac108
2
C-bus with interrupt
© NXP B.V. 2006. All rights reserved.
V
P0 to P7
V
to interrupt logic
DD
SS
P0 to P7
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