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PCA9539DB Datasheet(PDF) 20 Page - Texas Instruments

Part # PCA9539DB
Description  PCA9539 Remote 16-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output, Reset, and Configuration Registers
PDF  48 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCA9539DB Datasheet(HTML) 20 Page - Texas Instruments

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8.3.2.1 Device Address
Figure 8-6 shows the address byte of the PCA9539.
1
1
1
0
A1 A0
Slave Address
R/W
Fixed
Programmable
1
Figure 8-6. Pca9539 Address
Table 8-2. Address Reference
INPUTS
I2C BUS SLAVE ADDRESS
A1
A0
L
L
116 (decimal), 74 (hexadecimal)
L
H
117 (decimal), 75 (hexadecimal)
H
L
118 (decimal), 76 (hexadecimal)
H
H
119 (decimal), 77 (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.
8.3.2.2 Control Register And Command Byte
Following the successful acknowledgment of the address byte, the bus master sends a command byte that is
stored in the control register in the PCA9539. 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.
0
0
0
B2
B1
B0
0
0
Figure 8-7. Control Register Bits
Table 8-3. Command Byte
CONTROL REGISTER BITS
COMMAND
BYTE (HEX)
REGISTER
PROTOCOL
POWER-UP
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
1
1
1
0x07
Configuration Port 1
Read/write byte
1111 1111
PCA9539
SCPS130H – AUGUST 2005 – REVISED MARCH 2021
www.ti.com
20
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Product Folder Links: PCA9539



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