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LMX2820: RE: SPI programming issue

Lokesh B
Prodigy 10 points

Part Number: LMX2820

PLL frequency is not locked, while writing the registers into lmx2820 done from Atmega controller using BIT banging SPI because the SPI lines in controller are using by JTAG interface to flash the hex file . 

I have exported the registers from TICS pro, and i kept in a loop to write but not works.suggest me a better solution.

  • +1
    TI__Guru** 116070 points

    Hi Lokesh,

    To debug, use a scope to capture the SPI signals waveform, verify if they are correct.

    You can also try, after Vcc power up, program POWERDOWN = 1. If the programming is successful, there should be a few hundred of mA current drop. 

  • 0
    Prodigy 10 points

    Thanks Noel,
    The issue is resolved but i need to know that what are the registers need to be changed for manual writing of registers without using TICS pro and the Calculations required to update the correct bits in registers.