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Original question:

TX7332EVM: Change TR Switch Clock Rate?

TX7332EVM: Changing TR Switch Clock Rate

Kevin Huang5
Prodigy 80 points
Part Number: TX7332EVM

I want to reduce the frequency of the TR switches from 1kHz to somewhere around 250Hz. Previously I asked how to do this on the forums and was told to "remove R139 resistor on the TX7332 EVM and apply an external SYNC signal on U10 pin #3 using AWG." However, checking the datasheet and probing the pins shows that pin #3 is always held high at 1V and pin #2 is the one with the pulse. Is it correct then that pin#2 is where I should apply the SYNC signal and not pin #3? And is this SYNC signal just a short pulse?

Also, instead of modifying the hardware, is there a way to modify the CPLD's programming to change the sync pulse rate while still using the GUI without issues?

  • 0
    TI__Mastermind 49746 points

    Hi Kevin,

    Yes, you are correct. It was a mistake from our side. You need to remove resistor R136 and apply the signal to Pin2 of U10. Keep R139 as it is. We see that you have access to TI mysecuresoftware link. In the secure server, we have uploaded the CPLD code, look for file "TX7332CPLDFW-1.0-windows-installer.exe". You can open the project in Quartus and modify the SYNC generation logic as per your requirement, recompile it and program the CPLD.