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AWR1843: Do I need to change the software configuration when replacing the AWR1843 from a passive crystal oscillator to an active crystal oscillator?

hao zhang
Prodigy 20 points

Part Number: AWR1843
Other Parts Discussed in Thread: AWR2243, AWR6843, IWR6843

The development board provided for the AWR1843 uses a passive crystal oscillator. I want to replace it with a temperature-compensated active crystal oscillator (TCXO).
 
From the AWR1843 datasheet, I see that if an external clock is used as the clock source, the signal should only be connected to the CLKP pin, and CLKM should be connected to ground.
 
However, I am not sure whether I need to specify the external clock source type in the software configuration, or disable the internal oscillator (similar to configuring other MCUs in bypass mode).
 
If software configuration changes are required, could you tell me which specific registers I need to modify?
  • 0
    TI__Mastermind 38105 points

    Hello, we have received your case and the investigation will take some time. Thank you for your patience.

  • 0 回复 Eirwen
    TI__Mastermind 38105 points

    To replace the passive crystal with a 40MHz TCXO you do not need to modify software registers to "disable" the internal oscillator or set a bypass mode. The device hardware architecture automatically accommodates an externally driven clock when the appropriate physical connections are made

    the configuration for an external clock source is as follows:

    • CLKP (Pin J13): Connect the 40MHz TCXO output signal here.
    • CLKM (Pin H13): Connect directly to ground.
    • Signal Level: Ensure the TCXO output meets the device's input swing requirements (typically 0.8V to 1.8V peak-to-peak for a sine/square wave). If your TCXO is a 1.8V CMOS output, it can be directly coupled; otherwise, AC coupling with a capacitor (e.g., 0.1µF) may be necessary if there is a DC offset.
  • 0 回复 Eirwen
    Prodigy 20 points

    Thank you for your reply. Additionally, could you please confirm whether software configuration changes are also not required when replacing the oscillator with an active TCXO for the three chips: IWR6843, AWR6843, and AWR2243?

  • 0 回复 hao zhang
    TI__Mastermind 38105 points

    Same applies to IWR6843, AWR6843. I will need to check for AWR2243.

  • 0 回复 Eirwen
    Prodigy 20 points

    Thank you for your reply. Please help me check the AWR2243, as it is also one of the chips we are using. It is very important for us to confirm whether it can directly use a temperature-compensated crystal oscillator (TCXO).