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MSP432P401M: 5V ADC Input

Akash Patel
Expert 6245 points

Part Number: MSP432P401M

Hi team,

We are interested in using the precision ADC on the MSP432P401M to interface to a 5V sensor. Do we have any reference designs or schematics showing our device connected a 5V sensor through a level shifter or voltage translator?

We require 16 bits of resolution. Is there another MCU in our portfolio capable of handling 5V and also has a 16-bit ADC?

Regards,

Akash

  • 0
    TI__Guru 53605 points
    Akash,
    I am not aware of a 5-V reference design but one option with the MSP432 would be a simple resistor divider (/2) and then through an op amp (voltage follower to effectively drive sample/hold circuit in ADC and keep resistor divider values high for power savings). The 2.5V reference is kindof a sweet spot for the MSP432 ADC in terms of the reference. This along with an external crystal and oversampling would get you an ENOB over 14-bits. In the current oversampling example the ADC is running at 1Msps but the effective sampling rate is 1/32 (~30khz).

    dev.ti.com/.../

    I will do some looking for a 5V part.

    Chris
  • 0 in reply to Chris Sterzik
    TI__Guru 53605 points
    Akash,
    I have been unsuccessful finding a device. I did find one C2000 part that was close, however, the max voltage was 4.6 and not 5V.

    Regards,
    Chris

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