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参数资料
| 型号： | MAX7325AEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 24QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 接口： | I²C |
| 输入/输出数： | 8 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 1.71 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
| 包括： | POR |
MAX7325
I2C Port Expander with 8 Push-Pull
and 8 Open-Drain I/Os
12
Maxim Integrated
If a port input data change occurs during the read
sequence, then INT is reasserted during the I2C STOP
bit. The MAX7325 does not generate another interrupt
during a single-byte or multibyte read.
Input port data is sampled during the preceding I2C
acknowledge bit (the acknowledge bit for the I2C slave
address in the case of a single-byte or two-byte read).
A multibyte read from the push-pull ports of the
MAX7325 repeatedly returns the status of the eight out-
put ports, read back as inputs.
A single-byte write to either port groups of the
MAX7325 sets the logic state of all eight ports.
A multibyte write to either port group of the MAX7325
repeatedly sets the logic state of all eight ports.
Reading the MAX7325
A read from the open-drain I/O ports of the MAX7325
starts with the master transmitting the port group’s
slave address with the R/W bit set to high. The
MAX7325 acknowledges the slave address, and sam-
ples the ports during the acknowledge bit. INT
deasserts during the slave address acknowledge.
Typically, the master reads 1 or 2 bytes from the
MAX7325, each byte being acknowledged by the mas-
ter upon reception with the exception of the last byte.
When the master reads one byte from the open-drain
ports of the MAX7325 and subsequently issues a STOP
condition (Figure 6), the MAX7325 transmits the current
port data, clears the change flags, and resets the tran-
sition detection. INT deasserts during the slave
SCL
MAX7325 SLAVE ADDRESS
S1
1
0
A
P
1
PORT
tIV
N
P0
ACKNOWLEDGE
FROM MASTER
ACKNOWLEDGE
FROM MAX7325
P1
P2
P3
P4
P5
P6
P7
D0
D1
D2
D3
D4
D5
D6
D7
PORT I/O
INT OUTPUT
R/W
PORT SNAPSHOT
tPH
tIR
PORT SNAPSHOT
S = START CONDITION
SHADED = SLAVE TRANSMISSION
P = STOP CONDITION
N = NOT ACKNOWLEDGE
tPSU
tIP
INT REMAINS HIGH UNTIL STOP CONDITION
Figure 6. Reading Open-Drain Ports of the MAX7325 (1 Data Byte)
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