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CC2340R5: Running Bluetooth®︎ Low Energy on CC2340R5 Without a 32 kHz Crystal

Cole Mehring
Prodigy 30 points
Part Number: CC2340R5
Other Parts Discussed in Thread: CC2640

Is there a document for how to run BLE on the CC2340R5 without a 32khz crystal, like there is for the CC2640? Or can SWRA499C be used a guide for the CC2340R5? Reference SWRA499C.

www.ti.com/.../swra499c.pdf

  • 0
    TI__Guru** 101460 points

    Hi Cole,

    Thank you for reaching out.

    May I kindly ask how you are planning to configure the system? Here are some of the questions I need your inputs on:

    - Which Bluetooth LE role the CC2340R5 will have (peripheral, broadcaster, central, scanner)? Will the device establish some Bluetooth connections?

    - What is the temperature range you are aiming for? What is the temperature change per minute you are aiming for?

    Best regards,

  • 0 in reply to Clément
    Prodigy 30 points

    Hello Clément,

    1. Role - Broadcaster

    2. Sometimes there will be Bluetooth connections, and we intend to support OAD on this device

    3. Temperature range: -40C~60C

    4. Temperature change per minute: probably not more than 1C per minute

  • 0 in reply to Cole Mehring
    TI__Guru** 101460 points

    Hello Cole,

    Characterization for crystal-less operations is still on-going. I cannot share the expected timeline on a public forum.

    In general,

    - pure broadcasters implementations don't require a crystal as Low Frequency Clock Source.

    - central implementations absolutely require a crystal as Low Frequency Clock Source.

    - peripheral implementations may or may not require a crystal as Low Frequency Clock Source depending on temperature range, temperature change, and other factors. The characterization work mentioned before should determine the limits of crystal-less operation and provide the proper configuration to implement it.

    Best regards,

  • 0 in reply to Clément
    Prodigy 30 points

    Clément,

    Can you please reach out to me outside this forum to discuss expected timeline and characterization work?

    Thank you,
    Cole