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CC1120: Trouble with SPI interface.

Juhi Wani
Prodigy 70 points
Part Number: CC1120

The CC1120 IC's SO pin shows no response on 4 wire spi interface with mcu. I tried to write data in the registers and read it on the SO pin to check if the ic is working properly, but no data was read. Even on pulling the CSn low, there is no change in the level of SO, it does not go low.  

On testing the code on the cc1120 module, it works fine, but does not work with our design board. 

Can anyone elaborate why is this issue occurring?

Is there any specific way in which this package needs to be soldered by hand?

Also, is there any way in which we can check whether the IC is working properly?

I have attached the KICAD board file and schematic, along with the reference schematic.

Thanks and regards,

Juhi.

RF BOARD old.zip

  • 0
    TI__Guru**** 317180 points

    From the User Guide:

    "The status byte contains key status signals, useful for the MCU. The first bit, S7, is the CHIP_RDYn signal and this signal must go low before the first positive edge of SCLK. The CHIP_RDYn signal indicates that the crystal is stable"

    - Is the 32 MHz xtal running? 

    - Do you have ~1.8 V on DCPL and ~1.25 V on RBIAS? If not I would assume that you have an assembly issue. 

  • 0 in reply to TER
    TI__Guru**** 317180 points

    Have you had any progress here? 

  • 0 in reply to TER
    Prodigy 70 points

    The voltage values at dcpl and rbias pins are as suggested. 

    I am unable to determine if the crystal is working right. Can I get some suggestions on determining if the crystal oscillator is working?

    Regards

    Juhi

  • 0 in reply to Juhi Wani
    Prodigy 70 points

    I checked the crystal oscillator using the oscilloscope. Thats working fine.

    The cc is responding properly on spi interface now. There was probably an issue with soldering.

    Thanks a lot for your prompt response and assistance.

    Regards

    Juhi.