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MAX7311AWG Datasheet

  • MAX7311AWG

  • 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt an...

  • 377.43KB

  • 16页

  • MAXIM   MAXIM

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2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt and Hot-Insertion Protection
MAX7311
MAX7311 generates the acknowledge bit since the
MAX7311 is the recipient. When the MAX7311 is trans-
mitting to the master, the master generates the
acknowledge bit.
Slave address pins AD2, AD1, and AD0 choose 1 of 64
slave ID addresses (Table 7).
Data Bus Transaction
The command byte is the first byte to follow the 8-bit
device slave address during a write transmission
(Table 1, Figure 7). The command byte is used to deter-
mine which of the following registers are written or read.
Writing to Port Registers
Transmit data to the MAX7311 by sending the device
slave address and setting the LSB to a logic zero. The
command byte is sent after the address and deter-
mines which registers receive the data following the
command byte (Figure 7).
Slave Address
The MAX7311 has a 7-bit-long slave address (Figure 6).
The 8th bit following the 7-bit slave address is the R/W
bit. Set this bit low for a write command and high for a
read command.
PROGRAMMABLE
SDA
A6
MSB
SDA
A5
A4
A3
A2
A1
A0
LSB
R/W
ACK
Figure 6. Slave Address
Table 1. Command Byte Register
COMMAND BYTE
ADDRESS (HEX)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0xFF
Input port 1
Input port 2
Output port 1
Output port 2
Port 1 polarity inversion
Port 2 polarity inversion
Port 1 configuration
Port 2 configuration
Timeout register
Factory reserved. (Do not write to this register.)
FUNCTION
PROTOCOL
Read byte
Read byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
鈥?/div>
POWER-UP
DEFAULT
XXXX XXXX
XXXX XXXX
1111 1111
1111 1111
0000 0000
0000 0000
1111 1111
1111 1111
0000 0001
鈥?/div>
SCL
1
2
3
4
5
6
7
8
9
COMMAND BYTE
PORT 1 DATA
1
0 A
7
6
5
4
3
2
1
0 A
7
6
PORT 2 DATA
5
4
3
2
1
0
A
SDA
S
SLAVE ADDRESS
R/W
A
0
0
0
0
0
0
START
CONDITION
WRITE TO PORT
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
DATA OUT PORT 1
t
PV
READ FROM PORT 2
t
PV
Figure 7. Writes to Output Registers Through Write Byte Protocol
8
_______________________________________________________________________________________

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