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MSP430F5529: What is the preferred mcu for my application?

Adam Bartlett
Prodigy 30 points
Part Number: MSP430F5529
Other Parts Discussed in Thread: FDC1004, MSP430F5528, MSP430G2553

Hi there,

I am in the process of designing a system involving the fdc1004 capacitance to digital converter and would like to know what mcu people recommend.

The capacitance to digital converter will be used on a safety system to detect the proximity of a person leaning over a hand rail. (Long story short).

This hand rail is on a mobile machine and the system will be powered off a 12 volt battery source.

Required IO's from the mcu will be as follows.

- I2C to communicate with the fdc1004

- Some way to 'wake' the micro controller because it will only need to be on when an operator uses the controls on the machine.

- An output for an alarm/light. (Digital pin.)

- An output to stop the machine from operating. (Digital pin.)

The micro-controller will simply be reading the capacitance from the fdc and when the capacitance is higher than a particular value it will disable the machine from operation.

I have been using the MSP430F5528 on the launchpad development board for prototyping however I'm unsure if this is the best micro for the job.

I would appreciate any feedback on what mcu would best suit this application.

Regards,

Adam

  • 0
    TI__Guru**** 202446 points
    Hi Adam,

    Can you provide any more details regarding your system's requirements, such as operating frequency and minimum memory space? With the current parameters provided it appears that the most simple cost-effective solution would be to use a MSP430G2xx device. A USCI peripheral will drive the I2C lines and an interrupt-capable pin can be used to wake the MCU. You would also be able to use a MSP-EXP430G2 LaunchPad to help prototype the solution.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Prodigy 30 points

    Thanks for the reply Ryan,

    16MHz would be sufficient for the application.

    Also 16KB of memory would be enough.

    Because this system has a high emphasis on safety, how beneficial do you think it would be to use a MCU from the Hercules range?

    I have the MSP-EXP430G2 sitting on the desk and have been using that lately.

    Kind Regards,

    Adam

  • 0 in reply to Adam Bartlett
    TI__Guru**** 202446 points
    Based on the specifications provided I think the MSP430G2553 or similar G2xx device is suitable for your application. I'm also glad to hear that you have already been testing with a MSP-EXP430G2 LaunchPad. I do not have the expertise regarding Hercules MCU devices for safety-critical applications, are there any known certifications or benchmarks that you are required to meet?

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Prodigy 30 points

    Hi Ryan,

    Thanks for the quick reply.

    I think I will use the MSP430G2553 for now to get started.

    I will investigate the certifications that are required and then go from there.

    Regards,

    Adam

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