TCA6424 Datasheet, PDF (4/29 Pages) Texas Instruments – LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6424
LOW-VOLTAGE 24-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS175 – NOVEMBER 2007
LOGIC DIAGRAM (POSITIVE LOGIC)
INT ³²
LP Filter
Interrupt
Logic
ADDR ²⁶
29
SCL
30
SDA
Input
Filter
I²C Bus
Control
Shift
Register
24 Bits
I/O Port
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P27–P20
P17–P10
P07–P00
V_CCI
31
V_CCP
27
RESET ²⁸
GND ²⁵
Power-On
Reset
Write Pulse
Read Pulse
A. All I/Os are set to inputs at reset.
B. Pin numbers shown are for the RGJ package.
Simplified Schematic of P00 to P27
Data From
Shift Register
Data From
Shift Register
Write Configuration
Pulse
Write Pulse
Configuration
Register
DQ
FF
C_K Q
Read Pulse
Data From
Shift Register
Write Polarity Pulse
DQ
FF
C_K Q
Output
Port
Register
Input
Port
Register
DQ
FF
C_K Q
Q1
Q2
DQ
FF
C_K Q
Polarity
Inversion
Register
Output Port
Register Data
V_CCP
P00 to P27
ESD Protection Diode
GND
Input Port
Register Data
To INT
Polarity
Register Data
A. On power up or reset, all registers return to default values.
4
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