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| 型号： | MAX7323AEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 4B 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 接口： | I²C |
| 输入/输出数： | 4 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
| 包括： | POR |
MAX7323
Writing to the MAX7323
A write to the MAX7323 starts with the master transmit-
ting the MAX7323’s slave address with the R/W bit set
low. The MAX7323 acknowledges the slave address,
and samples the input ports during acknowledge. INT
goes high (high impedance if an external pullup resistor
is not fitted) during the slave acknowledge. The master
can now transmit 1 or more bytes of data. The MAX7323
acknowledges these subsequent bytes of data and
updates the interrupt mask register with each new byte
until the master issues a STOP condition (Figure 8).
Applications Information
Port Input and I2C Interface Level
Translation from Higher or Lower
Logic Voltages
The MAX7323’s SDA, SCL, AD0, AD2, RST, INT, and
P2–P5 are overvoltage protected to +6V independent of
V+. This allows the MAX7323 to operate from a lower
supply voltage, such as +3.3V, while the I2C interface
and/or some of the four I/O ports are driven from a
higher logic level, such as +5V.
The MAX7323 can operate from a higher supply volt-
age, such as +3V, while the I2C interface and/or some
of the four I/O ports P2–P5 are driven from a lower logic
level, such as +2.5V. Apply a minimum voltage of 0.7 x
V+ to assert a logic-high on any input. For example, a
MAX7323 operating from a +5V supply may not recog-
nize a +3.3V nominal logic-high. One solution for input-
level translation is to drive the MAX7323 inputs from
open-drain outputs. Use a pullup resistor to V+ or a
higher supply to ensure a high logic voltage greater
than 0.7 x V+.
Port-Output Port-Level Translation
The open-drain output architecture allows for level
translation to higher or lower voltages than the
MAX7323’s supply. Use an external pullup resistor on
any output to convert the high-impedance logic-high
condition to a positive voltage level. The resistor can
be connected to any voltage up to +6V, and the resis-
tor value chosen to ensure no more than 20mA is sunk
in the logic-low condition. For interfacing CMOS inputs,
a pullup resistor value of 220k
Ω is a good starting
point. Use a lower resistance to improve noise immuni-
ty, in applications where power consumption is less
critical, or where a faster rise time is needed for a given
capacitive load.
Each of the four output ports O0, O1, O6, and O7 has
protection diodes to GND (Figure 9). When a port is dri-
ven to a voltage lower than GND, the protection diode
clamps the output to a diode drop below GND.
Each of the four I/O ports P2–P5 also has a 40k
Ω (typ)
pullup resistor that can be enabled or disabled. When a
port is driven to a voltage higher than V+, the body
diode of the pullup enable switch conducts and the
40k
Ω pullup resistor is enabled. When the MAX7323 is
powered down (V+ = 0), each I/O port appears as a
40k
Ω resistor in series with a diode connected to zero.
Each port is protected to +6V under any of these
circumstances (Figure 10).
I2C Port Expander with 4 Push-Pull Outputs
and 4 Open-Drain I/Os
12
______________________________________________________________________________________
SCL
SDA
START CONDITION
R/W
SLAVE ADDRESS
S0
123
4
5
6
7
8
AA
A
tPV
DATA 1
DATA 2
tPV
DATA TO PORT
tPV
DATA 2 VALID
DATA 1 VALID
INTERNAL WRITE
TO PORT
DATA OUT
FROM PORT
tPV
S = START CONDITION
SHADED = SLAVE TRANSMISSION
P = STOP CONDITION
N = NOT ACKNOWLEDGE
Figure 8. Writing to the MAX7323
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7323ATE | 功能描述:接口-I/O扩展器 I2C Port Expander w/4 P-P Out & 4 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 |
| MAX7323ATE+ | 功能描述:接口-I/O扩展器 I2C Port Expander w/4 P-P Out & 4 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 |
| MAX7323ATE+T | 功能描述:接口-I/O扩展器 I2C Port Expander w/4 P-P Out & 4 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 |
| MAX7323ATE-T | 功能描述:接口-I/O扩展器 I2C Port Expander w/4 P-P Out & 4 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 |
| MAX7324 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs |
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