TCA9554_15 Datasheet, PDF (17/38 Pages) Texas Instruments – TCA9554 Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers

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Programming (continued)
TCA9554
SCPS233D – MARCH 2012 – REVISED AUGUST 2015
SDA
SCL
Data Line
Stable;
Data Valid
Change
of Data
Allowed
Figure 16. Bit Transfer
Data Output
by Transmitter
Data Output
by Receiver
NACK
ACK
SCL From
Master
S
Start
Condition
1
2
8
Figure 17. Acknowledgment on I²C Bus
BYTE
I²C slave address
Px I/O data bus
Table 1. Interface Definition Table
BIT
7 (MSB)
6
5
4
3
2
L
H
L
L
A2
A1
P7
P6
P5
P4
P3
P2
9
Clock Pulse for
Acknowledgment
1
0 (LSB)
A0
R/W
P1
P0
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