TCA6424A
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SCPS193B –JULY 2010–REVISED SEPTEMBER 2010
Simplified Schematic of P00 to P27
Data From
Shift Register
Output Port
Configuration
Register
Register Data
V
CCP
Data From
Shift Register
D
Q
Q1
FF
K
Write Configuration
Pulse
C
D
C
Q
Q
Q
FF
K
P00 to P27
Write Pulse
Q2
ESD Protection Diode
GND
Output
Port
Register
Input
Port
Register
Input Port
D
Q
Q
Register Data
FF
Read Pulse
CK
D
To INT
Data From
Shift Register
Polarity
Q
Q
Register Data
FF
Write Polarity Pulse
C
K
Polarity
Inversion
Register
A. On power up or reset, all registers return to default values.
Copyright © 2010, Texas Instruments Incorporated
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