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Compiler/MSP430FR2433: MSP430FR2433 P1.0/P1.6 worked as external TA0/TA1. how to detect only 1V Voltage amplitude signal?

user5264086
Prodigy 40 points
Part Number: MSP430FR2433
Other Parts Discussed in Thread: LDC1314, , SN74LV1T125, MSP430L092

Tool/software: TI C/C++ Compiler

Dears

      We use MSP430FR2433 connect to LDC1314 with I2C interface.

      1. USE external oscillator connect to MSP430FR2433 P1.6 and P1.0 as timer TA0.CCI1A and TA1.CC12A.

      2. MSP430FR2433 worked at 2.8V.

      3. external oscillator signal's voltage amplitude which input to MSP430FR2433's P1.0/P1.6 is 1V.  My question is MSP430FR2433 can't detect the oscillator signal since Voltage amplitude is only 1V.

         because we are low power solution, there's no room space to increase oscillator signal Voltage amplitude. Is there anyway to configure MSP430FR2433 or change schematics so that MSP430FR2433

        timer can detect the 1V amplitude oscillator input signal?   Even with schematics changed ,we hope it's sill low power.

thanks a lot and best regards

  • 0
    TI__Genius 14165 points

    Hi,

    the datasheet specifies in Table 5-10 the digitial inputs requirements to detect a logical high signal.

    As shown in the table you need something between 0.9V (at 2.2V DVCC) and 1.35V (at 3.0V DVCC) to detect a one. This is how Schmitt Trigger works.
    So if you want to reliable detect the signal of the oscillator you need to implement level shifter, here the SN74LV parts might be an option for you. e.g. SN74LV1T125

    Alternatively you can choose the MSP430L092 which operates down to 0.9V or you choose a MSP derivate with a Comparator where you catch the oscillator with the comparator and forward its output to the timer (but before doing this I recommend the level shifter)

  • 0 in reply to Dietmar Walther
    Prodigy 40 points

    resolved my issue, thank you very much.

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