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TCA9535 Datasheet(PDF) 18 Page - Texas Instruments

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Part No. TCA9535
Description  Low-Voltage 16-Bit I2C and SMBus Low-Power I/O Expander with Interrupt Output and Configuration Registers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TCA9535 Datasheet(HTML) 18 Page - Texas Instruments

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SCL
SDA
MSB
Bit
Bit
Bit
Bit
Bit
Bit
LSB
Byte: 1010 1010 ( 0xAAh )
1
0
1
0
1
0
1
0
SDA line stable while SCL line is high
ACK
ACK
SCL
SDA
STAR T
Condition
STOP
Condition
Data Transfer
18
TCA9535
SCPS201D – AUGUST 2009 – REVISED JULY 2016
www.ti.com
Product Folder Links: TCA9535
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Copyright © 2009–2016, Texas Instruments Incorporated
Programming (continued)
Master-receiver terminates the transfer with a STOP condition.
Figure 24. Definition of Start and Stop Conditions
Figure 25. Bit Transfer
Table 1 shows the interface definition.
Table 1. Interface Definition
BYTE
BIT
7 (MSB)
6
5
4
3
2
1
0 (LSB)
I2C slave address
L
H
L
L
A2
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
8.5.1.1 Bus Transactions
Data is exchanged between the master and the TCA9535 through write and read commands, and this is
accomplished by reading from or writing to registers in the slave device.


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