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CC2340R5-Q1: Clarification on External Load Capacitor Requirements for CC2340R5-Q1

JHENG-WEI WU
Prodigy 140 points
Part Number: CC2340R5-Q1

Tool/software:

Hello TI,

In the datasheet SWRS292 (December 2023), on page 27, section "7.18.3.1 48 MHz Crystal Oscillator (HFXT)", Note 1 states:
"Adjustable load capacitance is integrated into the device. External load capacitors are required for systems targeting compliance with certain regulations."

Could you please clarify:

  1. What specific regulations are being referred to in this context?
  2. Why do these regulations necessitate the use of external load capacitors?

Additionally, I noticed that for CC13XX/CC26XX, the document SWRA640H (December 2018, Revised May 2024), on page 11, provides relevant details. However, where can I find equivalent guidance specifically for the CC2340R5-Q1? Thank you.

Many thanks,

Peter Wu

  • 0
    TI__Intellectual 2460 points

    Peter,

    I'll dig into the note about the use of external load capacitors and provide guidance on what regulations this note applies to. As for your question about app note SWRA640H, majority of that document also applies to the CC2340R5-Q1 device but I'm not certain the regulations identified in this app note also apply to the CC2340R5-Q1. FYI, we are actively working on releasing a version of this document that specifically applies to the family of devices the CC2340R5-Q1 device falls under. 

    Regards,

    Andrew

  • 0 in reply to Andrew Lugo
    Prodigy 140 points

    Hello Andrew,

    Thank you for your reply. As we plan to begin the 48MHz crystal Cload tuning with the vendor in February, please let me sharpen my question: If we are using the CC2340R5-Q1 only for 2.4GHz BLE application without an external amplifier, is it safe to use the cap array for Cload tuning without encountering any related errata? Thank you.

    Many thanks,

    Peter Wu

  • 0 in reply to JHENG-WEI WU
    TI__Intellectual 2460 points

    Peter,

    I understand the concern and the reason why you need to know if the internal cap array can be used for tuning. I'm still looking into this matter and hope to have an answer for you soon.

    Regards,

    Andrew

  • 0 in reply to Andrew Lugo
    TI__Intellectual 2460 points

    Peter,

    I've confirmed that the use of the internal cap array can be used without any concern of violating the regulations you've pointed out in your original post. 

    Regards,

    Andrew