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MSP430FR5969: Programming using UART - Voltage required

Morgan Novak
Prodigy 175 points
Part Number: MSP430FR5969
Other Parts Discussed in Thread: LP3982, TIDA-01172

I am running an msp430fr5969 at 1.8v (I have the LP3982 circuit configured for start-up conditions - similar to TIDA-01172).

In order to program this chip, I can not use the debugger or usb since those are at 3.3V.

I am looking at using UART  (MSP430FRBoot) however the MSP430FRBoot – Main Memory Bootloader and Over-the-Air Updates for MSP430 FRAM (Rev. E) -section 5.3 mentions that a 3.3v voltage source must be used. If this is true, how can I program the MSP430fr5969 chip at 2V? 

Can I use a logic level shifter? 

  • 0
    Guru 33653 points

    FR5969 firmware update can be done on 2V, with BSL, SBW or JTAG. FR must be on same voltage level as UART bridge for BSL or SBW / JTAG master. For entry to BSL / SBW / JTAG mode, TEST / RESET pins are used so they also need to be adjust (from other side) to 2V. You can use lever shifter, but from my point of view it is easier to use master that can adjust itself to any voltage, including 2V.

  • 0 in reply to zrno soli
    TI__Guru 60361 points

    Hi Morgan,

    It's been a while since we have heard from you, so I'm going to assume you were able to move forward with your project.
    I will mark this posting as RESOLVED, but if this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information.
    If this thread is locked, please click the "Ask a related question" button, and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

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