TCA9539_15 Datasheet, PDF (19/42 Pages) Texas Instruments – Low Voltage 16-Bit I2C and SMBus Low-Power I/O Expander

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TCA9539
SCPS202B – OCTOBER 2009 – REVISED OCTOBER 2015
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. Interface Definition
BIT
BYTE
7 (MSB)
6
5
4
3
2
1
0 (LSB)
I²C slave address
H
H
H
L
H
A1
A0
R/W
P0x I/O data bus
P07
P06
P05
P04
P03
P02
P01
P00
P1x I/O data bus
P17
P16
P15
P14
P13
P12
P11
P10
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