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Mapping DAC output to other ports

rohith kumar veligeti
Prodigy 10 points
Other Parts Discussed in Thread: MSP430F6638

Hi

I am Rohith .I have been working with  MSP430F6638 microcontroller for a month . I am using  one of the DAC modules available  and its output is on  port6. I would like to know if it is possible to Map the same output to other ports.for example i want to have the same output on any of the pins in port1 is this possible with port mapping or any other way ?  

  • 0
    Guru 23000 points

    No. Analogue modules in/out-puts have fixed pin connections and can’t be mapped.

  • 0
    Guru 58965 points

    I do not have or use MSP430F6638. My understanding of the Data-sheet is:

    It has only one DAC12_A module with two channels.

    The analog outputs can be routed to either P6.6 & P6.7 or P7.6 & P7.7

    Pin mapping applies to P2 only and DAC12_A is not included.

  • 0
    Guru 227245 points

    Switching analog signals is way more complex than switching digital signals. To remap digital I/O, only a digital signal needs to be switched by a few gates to the output driver. And the driver will provide the output signal level and drive the current.
    Switching an analog signal requires an analog switch (which has a series resistance) and mapping it to different pins would require an analog driver on each port pin, to provide the required output impedance and driving current after the switch. Not to mention the risk of getting the signal influenced while it crosses the die to its destination pin.
    I’m surprised that there are a few MSPs with two alternative outputs for the DAC.

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