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MSP430FR2433: Error Connecting to the target : Unknown device

Stalin Muthiah
Prodigy 20 points
Part Number: MSP430FR2433
Other Parts Discussed in Thread: MSP-EXP430FR2433

For some reason in my MSP430FR2433 MCU, I'm unable to download the firmware through the TI Launch Pad. Took a few attempts but, I still had no luck in downloading the firmware successfully. 

1) Tried to use  a new launchpad " MSP-EXP430FR2433 "  ordered from TI 

2) Tried to Change the MCU chip to a New one 

3) Powered the target externally rather than pulling the 3.3V Power from the TI launchpad. 

4) Tried to change the Pull-down CAP Value on the TDIO line. ( 1nF , 1.5nF , 0.22nF ) 

 am I missing something?   please advise 

  • 0
    TI__Guru 71216 points

    Hi Stalin,

    So you are trying to program an FR2433 on your PC using an FR2433 launchpad, correct?

    If so, how long are the wires between the launch pad and your target device?

  • 0 in reply to Dennis Lehman
    Prodigy 20 points

    Hello Dennis, 

    Correct. I used the FSR2433 launchpad to program the FR2433 MCU. The Length of the wires (max ) could be around 4 inches. 

    Do you see any concern with the length of the wires?  I noticed this weird behavior of TDIO (PIN.No - 1 ) after powering the target MCU.  

    any reason the TDIO  (PIN.No - 1 ) is offset to 1.8V and pulsating?  thanks 

  • 0 in reply to Stalin Muthiah
    TI__Guru 71216 points

    Hi Stalin,

    The length is fine. You see these pulses with our without the launchpad connected to your target?

    There are (2) DVSS pins on this device (24p package) - do you have both grounded?

    Do you have a 0.1uF and either a 4.7uf or 10uF both connected to DVDD?

    I assume you can program the the MSP430FR2433 that is on the LP, correct?

  • 0 in reply to Dennis Lehman
    Prodigy 20 points

    Hello Dennis, 

    actually, in both cases,  (standalone target) or  (target + launchpad ) I see the pulses. 

    Also in both cases, TCLK (Pin No 2 )  stays Low.  

    I rechecked the DVDD and DVSS once again. 

    -> Pin No 18, 23, and 25 all three connected and  grounded 

    -> Pin 24  both 10UF and 0.1uF CAPs connected . 

    Correct. no issues programming the Launchpad. The TDIO Pin of the launchpad stays @ 3.3V Level after the Power ON 

  • 0 in reply to Stalin Muthiah
    TI__Guru 71216 points

    Hi Stalin,

    Regarding the pulses, that may or may not be normal.  It depends on the state of the programmer.  As you pointed out, when successful the pin stays @ 3.3v.

    It shouldn't be this much trouble to get this to work, so I suspect it is something simple that we are just overlooking it.

    Looking at your schematic again I see a VR8.  It should be fine, but have you tried depopulating it to see if maybe it impacting the timing on the TST/SBWTCK pin?  Any chance you got the RST/SBWTDIO and TST/SBWTCK backwards on your PCB?

  • 0 in reply to Dennis Lehman
    Prodigy 20 points

    Hello Dennis, 

    when you say state of the Programmer, I guess you mean the Launchpad. I tried swapping the different Launchpads 2311 and 2433 and the behavior is same on the target.    

    I didn't populate the VR8, and I just reserved it as a Placeholder. other than SBW is there any other way we can get the Launchpad connected to Target?  may be through UART / I2C /SPI? 

  • 0 in reply to Stalin Muthiah
    Prodigy 20 points

    Hello Dennis, 

    Got to know about the MSP Flasher tool today and gave a try.

    chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/www.ti.com/.../slau654e.pdf

    same error.  any clues from the below snapshot? 

  • 0 in reply to Stalin Muthiah
    TI__Guru 71216 points

    Hi Stalin,

    Ok, we have ruled out the VDD and ground possibilities.  What about the SBW connections. Are you absolutely sure you are connecting SBWTDIO from the LP to SBWTDIO on your target?  SBWTCK also?

    Where did you get these devices from, TI, Digikey, other?

  • 0 in reply to Dennis Lehman
    Prodigy 20 points

    Hello Dennis, 

    The Connections are correct from LP to target. it's only 4 Wires (SBWTDIO, SBWTCK, 3.3V, GND). I even tried to source the Power externally instead of pulling the 3.3V from the LP. 

    The Parts were ordered from Mouser Electronics and dispatched to me last year NOV 2023. Do you think we need to route the SBWTDIO, SBWTCK as differential signals? I would like to see the LP routing but, I couldn't find the .BRD file. Can you please share the .BRD file of the LP? Thanks  

  • 0 in reply to Stalin Muthiah
    Prodigy 20 points

    Hello Dennis, 

    Another important point - I used a hot air blower to do the assembly and disassembly of the MCU Chip. do you think the blown air temperature can damage the Chip?   

  • 0 in reply to Stalin Muthiah
    TI__Guru 71216 points

    Hi Stalin,

    Sorry for the delay in response (out of office mon,tues).

    No, unless you heated the device for several minutes I wouldn't be too concerned. I'm looking at the PCB file that was provided in email and don't see anything out the ordinary.  I'm looking back at your comment about pulses on pin1.  This is RST pin and is input, so not sure what is going on there.  I'll set something up on the bench and try to reproduce those pulses.

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