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參數(shù)資料
| 型號： | MAX7326ATG+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 75 |
| 接口： | I²C |
| 輸入/輸出數(shù)： | 16 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 400kHz |
| 電源電壓： | 1.71 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-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 24-TQFN-EP（4x4） |
| 包裝： | 管件 |
| 包括： | POR |
MAX7326
I2C Port Expander with 12 Push-Pull Outputs
and 4 Inputs
______________________________________________________________________________________
15
Applications Information
Port Input and I2C Interface Level
Translation from Higher or Lower
Logic Voltages
The MAX7326’s SDA, SCL, AD0, AD2, RST, INT, and
I2–I5 are overvoltage protected to +6V independent of
V+. This allows the MAX7326 to operate from a lower
supply voltage, such as +3.3V, while the I2C interface
and/or any of the four input ports are driven from a
higher logic level, such as +5V.
The MAX7326 can operate from a higher supply volt-
age, such as +3V, while the I2C interface and/or some
of the four input ports I2–I5 are driven from a lower
logic level, such as +2.5V. For V+ < 1.8V, apply a mini-
mum voltage of 0.8 x V+ to assert a logic-high on any
input. For V+ ≥ 1.8V, apply a voltage of 0.7 x V+ to
assert a logic-high. For example, a MAX7326 operating
from a +5V supply may not recognize a +3.3V nominal
logic-high. One solution for input level translation is to
drive the MAX7326 inputs from open-drain outputs. Use
a pullup resistor to V+ or a higher supply to ensure a
high logic voltage of greater than 0.7 x V+.
Port Output Signal Level Translation
Each of the push-pull output ports (O0, O1, and
O6–O15) has protection diodes to V+ and GND (Figure
11). When a port output is driven to a voltage higher
than V+ or below GND, the appropriate protection
diode clamps the output to a diode drop above V+ or
below GND. Do not overvolt output ports O0, O1, and
O6–O15. When the MAX7326 is powered down (V+ =
0), each output port appears as a diode clamp to GND
(Figure 11).
Each of the four input ports I2–I5 has a protection diode
to GND (Figure 12). When a port input is driven to a
voltage lower than GND, the protection diode clamps
the output to a diode drop below GND.
Each of the four input ports (I2–I5) also has a 40k
(typ) pullup resistor that can be enabled or disabled.
When a port input is driven to a voltage higher than V+,
the body diode of the pullup enable switch conducts
and the 40k pullup resistor is enabled. When the
MAX7326 is powered down (V+ = 0), each input port
appears as a 40k resistor in series with a diode con-
nected to zero. Input ports are protected to +6V under
any of these circumstances (Figure 12).
Driving LED Loads
When driving LEDs from one of the 12 output ports (O0,
O1, or O6–O15), a resistor must be fitted in series with
the LED to limit the LED current to no more than 20mA.
Connect the LED cathode to the MAX7326 port, and
the LED anode to V+ through the series current-limiting
resistor, RLED. Set the port output low to light the LED.
I2–I5
PULLUP
ENABLE
INPUT
40k
V+
MAX7326
Figure 12. MAX7326 Input Port Structure
Figure 11. MAX7326 Push-Pull Output Port Structure
OUTPUT
V+
O0, O1,
O6–O15
MAX7326
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7326ATG+ | 功能描述:接口-I/O擴展器 I2C Port Expander w/12 P-P Out & 4 In RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7326ATG+T | 功能描述:接口-I/O擴展器 I2C Port Expander w/12 P-P Out & 4 In RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7326ATG-T | 功能描述:接口-I/O擴展器 RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7326EVCMAXQU+ | 功能描述:界面開發(fā)工具 MAX7326 Max7526 Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| MAX7326EVKIT+ | 功能描述:界面開發(fā)工具 MAX7326 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
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