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CC1120: PLL unlock

Part Number: CC1120

When sending, one of the following errors occurs and the message cannot be sent.

Please tell me the cause and countermeasures.

(1)PLL SETTLING timeout
After sending the STX command strobe, the Status Byte STATE[2:0]
does not change to TX within 1ms.
The LOCK bit of the FSCAL_CTRL register suddenly becomes 0 (FS is out of lock).
  • Which version of the CC1120 are you using? 

    Are you following the work-around from the errata note (if applicable)

    CC112x, CC1175 (Rev. D) (

    Please specify what register settings you are using, what HW you are using (custom or an EM) and what you are measuring for (1). Is the device not entering TX at all (what state is it entering) or is it entering TX after a longer time (how long?)

    Please show plots of your SPI transactions so I can understand how you are measuring/testing.

    How are you measuring/detecting (2)?