• State Resolved
  • Locked Locked
  • Replies 8 replies
  • Subscribers 43 subscribers
  • Views 611 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PMP9777: Can this design drive a low power microcontroller?

DIPEN SHAH
Intellectual 405 points
Part Number: PMP9777
Other Parts Discussed in Thread: TPS610981

Namaste TI Support Executive,

I've gone through TI's Reference Design - PMP9777 (Getting Power from Earphone Jack Reference Design). I understand that the current sourcing capability of this design is input signal dependent (Left/ Right channel) and, that the TPS610981 can provide up to 50 mA total output current at 0.7 V input to 3.3 V output conversion.

I'd like to know if this output is adequate for driving a low power microcontroller. If Yes, I'd request your inputs on selecting a microcontroller, which can be operated using this PMP9777 design.

Thanks | Regards,

Dipen Shah

  • 0
    TI__Mastermind 46905 points
    Hi DIPEN,
    I think the question is related to the application detail: what is the input? earphone Jack? the output is only for micro-controller? TI has many low power micro-controller, what are you try to achieve with this micro-controller. we should select a micro-controller firstly , then select the power solution.
  • 0 in reply to Jasper Li
    Intellectual 405 points
    Namaste Jasper Li,

    Simply put, the application involves automating the communication between two mobile phones. Additional external hardware will comprise of a voice recorder chip and a low-power micro-controller. The idea is to power the entire external system over the earphone jack. The mobile phone's App would alert the external hardware about an incoming call, over the Left/ Right channel. Once call is established, a pre-recorded audio file would get played, which will act as input to the MIC of the mobile phone, to be heard by the other party.

    So the input to the system and, PMP9777 in particular, would be from a mobile phone's earphone jack - either of the Left and Right channels.

    With the above details I hope you can suggest few micro-controllers for our custom design. Alternately, please do recommend any specific power solutions. However, please do bear in mind that the idea is to boost and generate power from the mobile's audio jack.

    Thanks | Regards,
    Dipen Shah
  • 0 in reply to DIPEN SHAH
    TI__Mastermind 46905 points
    Hi DIPEN

    As we test with the PMP9777, its output current capability is approximately 10mA. so loading should be smaller than this value.
    I know little about MCU. could you share what is the function of MCU in the requirement? we need to find other experts to suggest MCU.
  • 0 in reply to Jasper Li
    Intellectual 405 points
    Namaste Jasper Li,

    The low power MCU is expected to perform the below important functions.

    1. Respond to an incoming call interrupt, which will be provided by the mobile phone App over the L/ R channel of the earphone jack.
    2. Communicate over SPI protocol with a SD Card (we are considering a SD Card over a Voice Recorder chip) to read the audio files stored in digital format.
    3. Execute software to convert the audio file content from digital to analog (D/A operation) and, pass on the analog audio signal to the MIC of the earphone jack.

    The audio file is then heard by the person, who initiated the call.

    Is the PMP9777's output current capability 10 mA or 50 mA?

    Thanks | Regards,
    Dipen Shah
  • 0 in reply to DIPEN SHAH
    TI__Mastermind 46905 points
    Hi DIPEN
    based on our measurement, most the smart phone can support 10mA output current with PMP9777 reference design. high end phone would be higher current capability.

    I need to assign the post to MCU forum, so the MCU expert can support this case.
  • 0 in reply to Jasper Li
    Intellectual 405 points
    Namaste Jasper Li,

    Thank you for the clarification on the output current capability with PMP9777 reference design.

    I'd appreciate and request you to please assign this post to the MCU forum in order to identify a suitable LP MCU for our requirement.

    Thanks | Regards,
    Dipen Shah
  • 0 in reply to DIPEN SHAH
    TI__Guru** 110560 points
    MSP430 MCU should be a good choice for your application, you might select a right one based on your application as below link.

    www.ti.com/.../overview.html
  • 0 in reply to Yanming Luo
    Intellectual 405 points
    Namaste Yanming Luo and Jasper Li,

    Many thanks for suggesting MSP430 MCU for my application and, for the additional queries resolved above.

    Thanks | Regards,
    Dipen Shah