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CDCE62005EVM stand alone operation?

mbssch
Prodigy 20 points

Other Parts Discussed in Thread: CDCE62005, CDCE62005EVM

Dear board,

I was intending to use the CDCE62005EVM as stand alone signal generation board for evaluation purposes. Although I wrote the SPI registers to EEPROM and even changed ENCAL_MODE to 0 for startup calibration, the synthesizer will only operate with the USB cable attached and the java program running. I tried to supply +5V directly, with and without powering the CDCE62005 with external +3.3V. Nothing works, if the USB cable is not attached and the java program does not run.

Is the USB IC holding the CDCE62005 in power down or reset or something like that?

Best regards,

Stefan

 

  • 0
    TI__Expert 4150 points

    Hello Stefan,

    You are unfortunately correct, the USB controller holds the LDO power supply to the CDCE62005 in power down until the GUI is started. Once you start the GUI and the LDO turns on, you can disconnect the USB connector assuming you have a 5V power supply connected to the Walvort port (the black connector next to the USB connector). The EVM will now work until you power-cycle the 5V.

    It would require a TUSB controller firmware upgrade to change this. Unfortunately we don't have such update available right now. One other option would be to cut the trace between the TUSB controller and the LDO and blue-wire the LDO control input to keep it permanently turned on.

    Additional comments you want to verify: After programming the CDCE62006, you need to also store the program into EEPROM. You can do this under Tools menu, selecte "Write EEPROM unlocked". If you now power down and power up the EVM (click on Enable EVM power twice to disable and enable), you should see the device first off all be configured exactly like you intended. If not, your EEPROM programming was not successful. Maybe you had the EEPROM locked. If so, unlock the EEPROM first, and repeat entire procedure including "Write EEPROM unlocked".

    Best regards, Fritz

  • 0 in reply to Fritz
    Prodigy 20 points

    Thank you for the prompt answer! After putting ~EN of the LDO to GND, everything worked fine. Unfortunately, the LED indicating PLL Lock is not driven by the USB chip anymore in stand alone mode. But that's okay.

    Best regards

    Stefan