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TCA6408RGTRG4 датащи(PDF) 8 Page - Texas Instruments

номер детали TCA6408RGTRG4
подробное описание детали  LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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TCA6408RGTRG4 датащи(HTML) 8 Page - Texas Instruments

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Device Address
0
Slave Address
0
1
0
0 AD
DR R/W
Fixed
Programmable
0
Control Register and Command Byte
B2
B1
B0
B5
B4
B3
B7
B6
TCA6408
LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
Interface Definition
BIT
BYTE
7 (MSB)
6
5
4
3
2
1
0 (LSB)
I2C slave address
L
H
L
L
L
L
ADDR
R/W
I/O data bus
P7
P6
P5
P4
P3
P2
P1
P0
The address of the TCA6408 is shown in Figure 4.
Figure 4. TCA6408 Address
Address Reference
ADDR
I2C BUS SLAVE ADDRESS
L
32 (decimal), 20 (hexadecimal)
H
33 (decimal), 21 (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 acknowledgement of the address byte, the bus master sends a command byte, which
is stored in the control register in the TCA6408. Two bits of this data byte state the operation (read or write) and
the internal registers (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.
Figure 5. Control Register Bits
Command Byte
CONTROL REGISTER BITS
COMMAND
POWER-UP
BYTE
REGISTER
PROTOCOL
DEFAULT
B7
B6
B5
B4
B3
B2
B1
B0
(HEX)
0
0
0
0
0
0
0
0
00
Input Port
Read byte
xxxx xxxx(1)
0
0
0
0
0
0
0
1
01
Output Port
Read/write byte
1111 1111
0
0
0
0
0
0
1
0
02
Polarity Inversion
Read/write byte
0000 0000
0
0
0
0
0
0
1
1
03
Configuration
Read/write byte
1111 1111
(1)
Undefined
8
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