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PCA9554DGVR Datasheet(PDF) 7 Page - Texas Instruments

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Part # PCA9554DGVR
Description  REMOTE 8-BIT I2C AND SMBus 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

PCA9554DGVR Datasheet(HTML) 7 Page - Texas Instruments

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Device Address
0
1
0
0
A1
A2
A0
Slave Address
R/W
Fixed
Hardware
Selectable
Control Register and Command Byte
0
0
0
0
B1
B0
0
0
PCA9554
www.ti.com ........................................................................................................................................................ SCPS128B – JULY 2006 – REVISED AUGUST 2008
Figure 4 shows the address byte for the PCA9554.
Figure 4. PCA9554 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. When it is high (1), a read
is selected, 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 PCA9554. Two bits of this command 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
Command Byte
CONTROL REGISTER BITS
COMMAND BYTE
POWER-UP
REGISTER
PROTOCOL
(HEX)
DEFAULT
B1
B0
0
0
0x00
Input Port Register
Read byte
XXXX XXXX
0
1
0x01
Output Port Register
Read/write byte
1111 1111
1
0
0x02
Polarity Inversion Register
Read/write byte
0000 0000
1
1
0x03
Configuration Register
Read/write byte
1111 1111
Copyright © 2006–2008, Texas Instruments Incorporated
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Product Folder Link(s): PCA9554
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