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TCA9535PWR Datasheet(PDF) 8 Page - Texas Instruments

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Part # TCA9535PWR
Description  LOW VOLTAGE 16-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TCA9535PWR Datasheet(HTML) 8 Page - Texas Instruments

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Device Address
0
1
0
0
A1
A2
A0
Slave Address
R/W
Fixed
Programmable
Control Register and Command Byte
0
0
0
B2
B1
B0
0
0
TCA9535
SCPS201A – AUGUST 2009 – REVISED SEPTEMBER 2009........................................................................................................................................... www.ti.com
Figure 4 shows the address byte of the TCA9535.
Figure 4. TCA9535 Address
Address Reference
INPUTS
I2C BUS SLAVE ADDRESS
A2
A1
A0
L
L
L
32 (decimal), 20 (hexadecimal)
L
L
H
33 (decimal), 21 (hexadecimal)
L
H
L
34 (decimal), 22 (hexadecimal)
L
H
H
35 (decimal), 23 (hexadecimal)
H
L
L
36 (decimal), 24 (hexadecimal)
H
L
H
37 (decimal), 25 (hexadecimal)
H
H
L
38 (decimal), 26 (hexadecimal)
H
H
H
39 (decimal), 27 (hexadecimal)
The last bit of the slave address defines the operation (read or write) to be performed. A high (1) selects a read
operation, while a low (0) selects a write operation.
Following the successful acknowledgment of the address byte, the bus master sends a command byte that is
stored in the control register in the TCA9535. Three bits of this data byte state the operation (read or write) and
the internal register (Input, Output, Polarity Inversion, or Configuration) that will be affected. This register can be
written or read through the I2C bus. The command byte is sent only during a write transmission.
Once a command byte has been sent, the register that was addressed continues to be accessed by reads until a
new command byte has been sent.
Figure 5. Control Register Bits
Control Register
CONTROL REGISTER BITS
COMMAND
POWER-UP
REGISTER
PROTOCOL
BYTE (HEX)
DEFAULT
B2
B1
B0
0
0
0
0x00
Input Port 0
Read byte
xxxx xxxx
0
0
1
0x01
Input Port 1
Read byte
xxxx xxxx
0
1
0
0x02
Output Port 0
Read/write byte
1111 1111
0
1
1
0x03
Output Port 1
Read/write byte
1111 1111
1
0
0
0x04
Polarity Inversion Port 0
Read/write byte
0000 0000
1
0
1
0x05
Polarity Inversion Port 1
Read/write byte
0000 0000
1
1
0
0x06
Configuration Port 0
Read/write byte
1111 1111
8
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TCA9535


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