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MSP430FR2633: Query on Implementing Sleep Mode for MSP430F2633 with NXP Controller as Master

Reshma B R
Prodigy 20 points
Part Number: MSP430FR2633


Tool/software:

Hello,

I am currently working on a project where we are interfacing the MSP430F2633 with an NXP controller (LPC55S69) acting as the master. Our goal is to implement a low-power sleep mode for the MSP430F2633 to conserve energy when not in use.

I have the following questions regarding the sleep mode implementation:

  1. Sleep Mode Configuration:

    • Could you provide guidance or sample code on how to configure the MSP430F2633 for sleep mode? Specifically, I’m looking for information on entering LPM3 or LPM4 and what steps to follow when waking the device from sleep.

  2. I2C Communication with NXP Master:

    • Since the NXP controller is the I2C master, are there any considerations or settings we should be aware of when the MSP430 is in sleep mode? How can we ensure that the MSP430 wakes up and responds to I2C commands from the NXP controller?

  3. Best Practices for Power Consumption:

    • What are the best practices to ensure minimal power consumption when MSP430F2633 is in sleep mode, and how can we efficiently wake it up only when necessary?

Any guidance or code snippets on these topics would be greatly appreciated!

Thank you,
Reshma

  • 0
    Guru 24625 points

    This is all very basic and well covered in the supplied documentation. In general, the code will setup the hardware and then enter a low power mode while waiting for something to happen. Which will generate an interrupt. The system wakes up to process the interrupt and can, if you wish, cause an exit from the low power mode in the main, non interrupt, routine.

    The various hardware interfaces, such as I2C can operate even while the system is in a low power mode.

    Code examples are linked off of the product page.

  • 0
    TI__Mastermind 29105 points

    Hello Reshma,

    1. Sleep modes are covered in section 1.4 of the TRM, but I2C mode specifically can be used for wake down to LPM4  (not LPM3.5 of 4.5 modes).  Basic LPMx examples can be found in the SDK:  https://dev.ti.com/tirex/explore/node?node=A__AO.j.EvSQuAWXbIbplqmXw__msp430ware__IOGqZri__LATEST 

    2. As I mentioned above, I2C slave mode can wake the MSP430 down to LPM4 mode. Most commonly MSP430 will clock stretch if it needs more time to wake.  

    3. I will say that overall, one of the most important things to keep power lower is to configure your GPIOs correctly.  Generally, the lowest power state is output low for unused pins, ect.  There are tools for helping with low power development on MSP430, such as Energy trace.  

    I will leave you with a few resources: 

    https://www.ti.com/lit/ug/slau840a/slau840a.pdf  - MSP430 Guide book that will link you to basically all existing documentation and reference designs

    https://www.ti.com/lit/an/slaa603/slaa603.pdf - Advanced low power development guide:  Using the ULP and energy trace tools in CCS.  

    Good luck with your design!  

    JD

     

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