TCA9534_16 Datasheet, PDF (15/38 Pages) Texas Instruments – Low Voltage 8-Bit I2C and SMBUS Low-Power I/O Expander with Interrupt Output and Configuration Registers

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8.2 Functional Block Diagram
13
INT
1
A0
2
A1
3
A2
14
SCL
15
SDA
Input
Filter
LP Filter
I²C Bus
Control
TCA9534
SCPS197B – SEPTEMBER 2014 – REVISED NOVEMBER 2016
Interrupt
Logic
Shift
Register
8 Bits
I/O
Port
P7−P0
16
VCC
GND
8
Power-On
Reset
Write Pulse
Read Pulse
Pin numbers shown are for the PW package.
Figure 22. Functional Block Diagram
Data From
Shift Register
Data From
Shift Register
Write Configuration
Pulse
Write Pulse
Configuration
Register
DQ
FF
CK Q
Read Pulse
Q1
DQ
FF
CK Q
Q2
Output Port
Register
Input Port
Register
DQ
FF
CK Q
Output Port
Register Data
VCC
P0 to P7
ESD Protection
Diode
GND
Input Port
Register Data
To INT
Data From Shift
Register
Write Polarity
Pulse
DQ
FF
CK Q
Polarity Inversion
Register
Polarity
Register Data
At power-on reset, all registers return to default values.
Figure 23. Simplified Schematic Of P0 To P7
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