MCP4341数字电位器中PXA，PXW和PXB引脚的最大电流±2.5 mA指在AND中吗？

它表示正负，所以覆盖了两个方向。



      以下为原文

    It says plus or minus, so that covers both directions.
 

我明白了，所以数据表的这一部分是指SPI引脚？最大输出电流由任何输出引脚沉没，25毫秒输出电流由任何输出引脚……25…



      以下为原文

    I see.
 
So this part of the data sheet refers to the SPI pins?
 
Maximum output current sunk by any Output pin
......................................................................................25 mA
Maximum output current sourced by any Output pin
......................................................................................25 mA

是的，但是这些是引脚硬件的最大额定值，在短路情况下考虑，或者是高输出驱动到低输出的情况。在加载这样的电流时，没有任何关于信号电平的说明。所有的MOSFET晶体管在导通时都具有内阻。在功率晶体管的数据表中规定了RDS ON，对于大功率器件，可以是一些毫欧姆。在微控制器或数字电位器中，数字I/O引脚的类似特性可能在一些PIC器件具有显示引脚电压作为负载电流的功能的图表。高侧输出晶体管可能比低侧晶体管具有更多的电阻。当引脚短路到GND并且驱动高电平时，一些器件实际上是短路的，而不是当引脚。被短路到VDD和驱动Low。迈西尔



      以下为原文

     

Yes, but those are maximum ratings for the pin hardware,
for consideration in case of short circuit conditions, or a case like a High Output driving into a Low Output.
Does not say anything about signal level when loaded with such a current.
Datasheet will have other specs for what current may be loaded while maintaining rated signal level.
 
All MOSFET transistors have internal resistance when conducting.
Rds on is specified in datasheet for power transistors, and may be some milliohm for a large power device.
In a microcontroller or digital pot, the similar property for digital I/O pins may be in the range of a few hundred Ohm.
 
Some PIC devices have diagrams showing pin voltage as function of load current.
High-side output transistor may have more resistance than low-side transistor.
Some devices are practically short-circuit proof when a pin is shorted to GND and driven High,
Not so, when pin is shorted to Vdd and driven Low.
 
   Mysil

我需要从罐子里抽出5Ma，我能做些什么吗？如果我使用了一个四叉树，把PXA、PXB和PXW管脚并联，这会有什么区别吗？该应用是MIDI，5Ma是MIDI规范中所需的电流，然而，当在商业MIDI设备中测试时，只需要画几毫安。所以，我想知道在这个应用中是否可以。有什么想法吗？



      以下为原文

    I need to draw 5mA through the pot, is there anything I can do. What if I used a quadpot and put the PxA, PxB and PxW pins in parallel, would that make any difference?
 
The application is a MIDI one, and 5mA is the current required in the MIDI specification, however when tested in a commercial MIDI device, there is only a couple of milliamps being drawn. So, I wonder if it might be OK in this application. Any ideas?