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MSP432E401Y: PCB production testing

albgarc2014
Genius 3520 points
Part Number: MSP432E401Y

Hi TI!

We have a first series in production at the factory (based on MSP432E401YTPDTR).

So the factory can test if the MCU is alive.

Is there any pin on which we can measure to know if the MCU is alive? Of course with the board powered.

Thanks very much.

  • +1
    TI__Guru**** 190806 points

    Hi,

     If the flash on the MCU is erased which is the case when you have a virgin device mounted on the PCB, then there is not any pin that will toggle. Without a valid application in the flash, the ROM boot loader starts execution by scanning the supported communication interfaces until it receives a valid command to download firmware through a specific
    interface. This means if you have any device (UART, SPI or etc) on the board that will send the download command to one of the supported communication interfaces then the detected interface on the MCU will start to handshake with the external device. This could serve as an indication that the MCU is alive. 

  • 0 in reply to Charles Tsai
    Genius 3520 points

    Hi Charles, thanks very much!

    Could you please tell me where the serial commands for firmware upload are documented? 

  • +1 in reply to albgarc2014
    TI__Guru**** 190806 points

    You asked for any pin which can indicate if the MCU is alive and I answered as such. Not sure why you rejected my answer. 

    You can find the serial commands documented in the Bootloader user's guide. https://www.ti.com/lit/pdf/spmu301. Go to section 5.3.

    Here is also an app note for serial bootloader. https://www.ti.com/lit/pdf/spma074