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CC2640: Deep Sleep without 32kHz crystal example

Charles McCallum
Intellectual 2600 points
Part Number: CC2640

Is there example code that will put the CC2640 into deep sleep and then wake it up on a button press but without the 32kHz crystal? I have seen the normal example of this with the crystal but not without.

  • 0
    TI__Guru 55305 points
    Hi,

    All you need to do is to change the SCLK_LF to run on RCOSCLF.

    This can be done through ccfg file.

    Can you elaborate which example you are running? Then we can better assist you.
  • 0 in reply to Christin Lee
    TI__Intellectual 2600 points
    Christin,
    There is one in the SDK example code. I have tried modifying as per above but it does not work. There is a document that says there is a lot more you have to do to get it to work. (www.ti.com/.../swra499b.pdf)
    It shows the code that has to also change but after making these modifications the chip will not wake up. So I can't tell if it is going to sleep or crashing.

    I am using SDK version 1.40.00.45

    Thanks,
    Charles
  • 0 in reply to Charles McCallum
    TI__Guru 55305 points
    Hi,

    The document you are referring to is to run BLE examples using the RCOSCLF as sleep clock source. Most of the modification is for it to pass the BLE regulation(SCA 500ppm).

    Just to clarify, when you say deep sleep, do you mean shutdown or standby?

    Which one is the example you are referring to? pinShutdown or pinStandby?
  • 0 in reply to Christin Lee
    TI__Intellectual 2600 points
    I was looking at the pinShutdown example. I want to get to the lowest current draw I can. Desire is to have this with BLE peripheral mode.
  • 0 in reply to Charles McCallum
    TI__Guru 55305 points

    The software I used is: tirtos_cc13xx_cc26xx_2_21_00_06 , and pinShutdown example

    I modified the ccfg.c to set uo the SCLK_LF source to be RCOSC_LF

    //#####################################
// Clock settings
//#####################################

#ifndef SET_CCFG_MODE_CONF_SCLK_LF_OPTION
// #define SET_CCFG_MODE_CONF_SCLK_LF_OPTION            0x0        // LF clock derived from High Frequency XOSC
// #define SET_CCFG_MODE_CONF_SCLK_LF_OPTION            0x1        // External LF clock
// #define SET_CCFG_MODE_CONF_SCLK_LF_OPTION               0x2        // LF XOSC
#define SET_CCFG_MODE_CONF_SCLK_LF_OPTION            0x3        // LF RCOSC
#endif

    which can be found her: C:\ti\tirtos_cc13xx_cc26xx_2_21_00_06\products\cc26xxware_2_24_03_17272\startup_files

    The procedure in the application note is only applicable with BLE examples, not for TIDriver examples. 

  • 0 in reply to Christin Lee
    TI__Intellectual 2600 points

    Christin,

    Thanks but I'm looking for an example with BLE as per the application note.  Is this available or can it be made available to a customer?

    Thanks,

    Charles

  • 0 in reply to Charles McCallum
    TI__Guru** 106705 points
    Hi Charles,

    Several of the BLE examples in the SDK, SimplePeripheral for example, has a dedicated build config for using the RC oscillator. Changing the build config will ensure all the required configurations are taken care of (ccfg, calibration, etc.).

    Regards,
    Fredrik