TCA9534_16 Datasheet, PDF (17/38 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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TCA9534
SCPS197B – SEPTEMBER 2014 – REVISED NOVEMBER 2016
Programming (continued)
– Master-receiver terminates the transfer with a STOP condition.
SCL
SDA
ST AR T
Condition
Data Transfer
STOP
Condition
Figure 24. Definition of Start and Stop Conditions
SDA line stable while SCL line is high
SCL
1
0
1
0
1
0
1
0
ACK
SDA
MS B
Bit
Bit
Bit
Bit
Bit
Bit
LSB
ACK
Byte: 1010 1010 ( 0xAAh )
Figure 25. Bit Transfer
Table 1 shows the TCA9534 interface definition.
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
1
0 (LSB)
A0
R/W
P1
P0
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