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参数资料
| 型号： | MAX7325AEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/17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
11
Maxim Integrated
Acknowledge
The acknowledge bit is a clocked 9th bit the recipient
uses to acknowledge receipt of each byte of data
(Figure 4). Each byte transferred effectively requires 9
bits. The master generates the 9th clock pulse, and the
recipient pulls down SDA during the acknowledge
clock pulse, such that the SDA line is stable low during
the high period of the clock pulse. When the master is
transmitting to the MAX7325, the device generates the
acknowledge bit because the MAX7325 is the recipi-
ent. When the MAX7325 is transmitting to the master,
the master generates the acknowledge bit because the
master is the recipient.
Slave Address
Each MAX7325 has two different 7-bit slave addresses
(Tables 2 and 3). The addresses are different to communi-
cate to either the eight push-pull outputs or the eight I/Os.
The 8th bit of the slave address following the 7-bit slave
address is the R/W bit. It is low for a write command, and
high for a read command (Figure 5). The first (A6), sec-
ond (A5), and third (A4) bits of the MAX7325 slave
address are always 1, 1, and 0 (P0–P7) or 1, 0, and 1
(O8 to O15). Connect AD0 and AD2 to GND, V+, SDA,
or SCL to select the slave address bits A3, A2, A1, and
A0. The MAX7325 has 16 possible pairs of slave
addresses (Tables 2 and 3), allowing up to 16
MAX7325 devices on an I2C bus.
Accessing the MAX7325
The MAX7325 is accessed though an I2C interface. The
MAX7325 has two different 7-bit slave addresses for
either the eight open-drain I/O ports (P0–P7) or the
eight push-pull ports (O8–O15). See Tables 2 and 3.
A single-byte read from the I/O ports (P0–P7) of the
MAX7325 returns the status of the eight I/O ports and
clears both the internal transition flags and the INT out-
put when the master acknowledges the slave address
byte. A single-byte read from the eight push-pull ports
(O8–O15) returns the status of the eight output ports,
read back as inputs.
A 2-byte read from the I/O ports (P0–P7) of the
MAX7325 returns the status of the eight I/O ports (as for
a single-byte read), followed by the transition flags.
Again, the internal transition flags and the INT output
are cleared when the master acknowledges the slave
address byte, yet the previous transition flag data is
sent as the second byte. A 2-byte read from the push-
pull ports of the MAX7325 repeatedly returns the status
of the eight output ports, read back as inputs.
A multibyte read (more than 2 bytes before the I2C
STOP bit) from the I/O ports (P0–P7) of the MAX7325
repeatedly returns the port data, followed by the transi-
tion flags. As the port data is resampled for each trans-
mission, and the transition flags are reset each time, a
multibyte read continuously returns the current data
and identifies any changing input ports.
SCL
SDA BY
TRANSMITTER
CLOCK PULSE
FOR ACKNOWLEDGEMENT
START
CONDITION
SDA BY
RECEIVER
12
89
S
Figure 4. Acknowledge
SDA
SCL
A5
MSB
LSB
ACK
A4
A1
A3
A0
A2
R/W
Figure 5. Slave Address
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7325AEG/V+ | 功能描述:接口-I/O扩展器 I2C Port Expander with 8 Push-Pull Outputs and 8 Open-Drain I/Os RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7325AEG/V+T | 功能描述:接口-I/O扩展器 I2C Port Expander with 8 Push-Pull Outputs and 8 Open-Drain I/Os RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7325AEG+ | 功能描述:接口-I/O扩展器 I2C Port Expander w/8 P-P Out & 8 I/O RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7325AEG+T | 功能描述:接口-I/O扩展器 I2C Port Expander w/8 P-P Out & 8 I/O RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7325AEG-T | 功能描述:接口-I/O扩展器 I2C Port Expander w/8 P-P Out & 8 I/O RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
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