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MSP430FR6047: Query Regarding EVM's Termination Resistor & its significance.

HARSH PALIWAL
Prodigy 10 points
Part Number: MSP430FR6047

Tool/software:

Hi,


1.In the above-mentioned Controller EVM two 200-ohm Termination resistors are being used is there any significance of those resistors?

2.Can i Change Resistor as per my need or it is fixed/advised to use 200-ohm resistor for my design please support with evidence or what could go wrong if i change those values.

3.When i tried to probe my ultrasonic sensor which is connected on J8 header of EVM i could see difference in Peak amplitude on Digital Oscilloscope & USS Software just the double value peak voltage i could see in USS Software.

4. USS waveform on DSO terminates with ringing waveform any particular for the same, these ringing waveforms increases with decrease in termination resistor values.

  • 0
    TI__Mastermind 35845 points

    Hi,

    1. Limit current. 

    2. You can change the value on your own design. But it is not recommended to directly remove them.

    3. It might caused by the ADC sampling rate is not high enough. But we do not recommend to use a higher ADC sampling rate. Around 4x of the signal frequency is recommend and enough for a typical meter design

    4. A higher resistor value helps the ringing decline faster. 

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    Prodigy 10 points

    Hi,
    Can you please ellaborate of point number 3.
    ADC Sampling rate is set high,still there is mismatch in waveform on Digital Storage Oscillscope & USS software.

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