參數(shù)資料
型號: MAX7318AWG+T
廠商: Maxim Integrated Products
文件頁數(shù): 18/19頁
文件大?。?/td> 0K
描述: IC PORT EXPANDER 16BIT 24SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1,000
接口: I²C,SM 總線
輸入/輸出數(shù): 16
中斷輸出:
頻率 - 時(shí)鐘: 400kHz
電源電壓: 2 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC W
包裝: 帶卷 (TR)
包括: POR
MAX7318
generates the acknowledge bit since the MAX7318 is
the recipient. When the MAX7318 is transmitting to the
master, the master generates the acknowledge bit.
Slave Address
The MAX7318 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.
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 MAX7318 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).
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
8
_______________________________________________________________________________________
SDA
A6
A5
A4
A3
A2
A1
A0
MSB
LSB
ACK
R/W
PROGRAMMABLE
Figure 6. Slave Address
COMMAND BYTE
ADDRESS (hex)
FUNCTION
PROTOCOL
POWER-UP
DEFAULT
0x00
Input port 1
Read byte
XXXX XXXX
0x01
Input port 2
Read byte
XXXX XXXX
0x02
Output port 1
Read/write byte
1111 1111
0x03
Output port 2
Read/write byte
1111 1111
0x04
Port 1 polarity inversion
Read/write byte
0000 0000
0x05
Port 2 polarity inversion
Read/write byte
0000 0000
0x06
Port 1 configuration
Read/write byte
1111 1111
0x07
Port 2 configuration
Read/write byte
1111 1111
0xFF
Factory reserved. (Do not write to this register.)
Table 1. Command-Byte Register
12
34
5
6
7
8
9
SCL
SDA
S
A
0000001
76543210
A
76543210
A
0A
SLAVE ADDRESS
COMMAND BYTE
PORT 1 DATA
PORT 2 DATA
R/W
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
START
CONDITION
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
tPV
WRITE TO PORT
DATA OUT PORT 1
READ FROM PORT 2
Figure 7. Writes to Output Registers Through Write-Byte Protocol
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