Datasheet

PCA9570 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4 — 17 September 2014 3 of 32
NXP Semiconductors
PCA9570
Remote 4-bit general purpose outputs for 1 MHz I
2
C-bus
5. Block diagram
Fig 1. Block diagram of PCA9570
Fig 2. Simplified schematic of the I/Os (P0 to P3)
002aah230
I
2
C-BUS
CONTROL
PCA9570
INPUT
FILTER
SHIFT
REGISTER
SDA
SCL
write pulse
read pulse
POWER-ON
RESET
V
DD
V
SS
OUTPUT
PORT
P0 to P3
4 bits
002aah231
write pulse
read pulse
D
CI
S
FF
Q
power-on reset
data from Shift Register
I
OL
P0 to P3
V
SS
D
CI
S
FF
Q
data to Shift Register
I
OH
V
DD