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MSP432P401R ANALOG INPUT

PESACH MAZOR
Prodigy 100 points

I would like to know what I need to add to the MSP432P401R while I use the the analog input to measure signals .

what is the input resistance of the input for analog input.

what will append while the input is a chain of 4 10k resistor connected between 3.3v and GND and the input to the 

device is the first resistor from GND

  • 0
    Guru 74080 points

    Hi Pesach!

    Have a look into the datasheet of the MSP432P401R, chapter 5.25.6 about the 14-Bit ADC. The tables list the specifications for the module.

    PESACH MAZOR said:

    what will append while the input is a chain of 4 10k resistor connected between 3.3v and GND and the input to the device is the first resistor from GND

    If you form a voltage divider like this...

         3.3V
      |
    __|__
   |     |
   |     |
   | 10k |
   |     |
   |_____|
      |
    __|__
   |     |
   |     |
   | 10k |
   |     |
   |_____|
      |
    __|__
   |     |
   |     |
   | 10k |
   |     |
   |_____|
      |_____________ V = 825mV
    __|__
   |     |
   |     |
   | 10k |
   |     |
   |_____|
      |
      |
     GND

    ...your voltage is 825mV. Calculate [(3.3V / 40,000) * 10,000] = 0.825V

    Dennis

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