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Powering the RF430FRL152H with LDO, JTAG Error

Roland B
Intellectual 320 points
Other Parts Discussed in Thread: RF430FRL152H

I'm confused about how you are powering the RF430FRL152H because if I connect VDDSW (Pin3) with VDDB (Pin4) to the LDO I still get an error on CCS: MSP430: Error connecting to the target: Unknown device. If I only connect the LDO to the VDDB Pin I get another error: Wrong JTAG Password.

I designed the same circuit you are using for the HVM with level shifting IC’s. I also can see the JTAG signal shifted to 1.5V… so this part of the circuit works fine. I added also the decoupling caps on pin 3, 4, 7, 10, 23, 24. TST Pins are directly grounded. Just the SPI, ADC and antenna pins are open. Where could be my fault?

  • 0
    TI__Expert 7820 points

    This problem could have a lot of causes.

    First, yes you do need to power VDDSW with 1.5V.  VDDB connection will have no effect in this application.

    If you have a schematic of what you built that would be helpful to share.

    Make sure that you have these signals level shifted: Reset and the four JTAG lines.

    One other thing to test would be to manually drive the level shifted lines (5 of them) with voltages and see if on the opposite side they are level shifting okay.  Of the five lines, TDO is the only one coming from the RF430FRL152H the rest are going to it.

    Let me know if this still does not help.

  • 0 in reply to Alex K.
    Intellectual 320 points
    I also use a pullup resistor like in figure 19 R33 for TMS and 2 pulldown resistors R1 and R2 for TDI and TDO. On my HEVM I used this switch configuration and it worked fine...
  • 0 in reply to Alex K.
    Intellectual 320 points
    I'm not shure where and how I can upload the schematics... Is there a way o could I email you directly the schematics?
    Thanks
  • 0 in reply to Roland B
    TI__Expert 7820 points

    Roland,

    Please email me at ---. (email address removed)
    Alex

  • 0 in reply to Alex K.
    Intellectual 320 points
    After reviewing my schematic and changing the MSP (maybe the ground pad was bad connected) I get a new error message which is in the MSP World quite famous. “Security fuse blown”
    I haven’t found good documentation about the reason of this error just workarounds with IRA Workbench or the bootstrap loader. But if this error occurs there have to be definitely a connection between the FET and the MSP?? Or could it be a bad hardware connection too?
  • 0 in reply to Roland B
    TI__Expert 7820 points

    Yes, if the ground pad is unconnected, then the JTAG connection will not work.

    To make sure that the ground pad is connected you should try this.  Power the device with 1.5V to VDDSW and measure the voltage on pin number 24 (VDD).  You should see at least 1V.  If there is no voltage then the device is not operational.

    If you have a logic analyzer or a scope you should capture the JTAG signals and makes sure that they are the right voltages and are changing at the RF430FRL152H side and also the FET tool side.  

  • 0 in reply to Alex K.
    Intellectual 320 points

    I found my mistake: I haven't really spend attention to the 1:10 ratio for the vddx2 and cfly. Now I changed the caps and the jtag connection works fine!
    Thanks for the help alex!