PCA9675
NXP Semiconductors
Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt
5. Block diagram
PCA9675
INTERRUPT
LP FILTER
LOGIC
INT
AD0
AD1
AD2
P00 to P07
SCL
SDA
2
SHIFT
REGISTER
I/O
PORT
INPUT
FILTER
I C-BUS
16 BITS
CONTROL
P10 to P17
write pulse
read pulse
POWER-ON
RESET
V
DD
V
SS
002aab627
Fig 1. Block diagram of PCA9675
V
DD
I
I
OH
write pulse
100 μA
I
trt(pu)
D
Q
data from Shift Register
power-on reset
P00 to P07
P10 to P17
FF
S
OL
CI
V
SS
D
Q
FF
S
CI
read pulse
to interrupt logic
data to Shift Register
002aab631
Fig 2. Simplified schematic diagram of P00 to P17
PCA9675
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 3 October 2011
3 of 34
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