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CC3200 - Using Wifi for Low Power Sensor

Alyssa Chatten
Prodigy 275 points
Other Parts Discussed in Thread: CC3200

Hi CC3200 team,

I am working on an application where I would like to use wifi for low power sensors and are looking to optimize our power consumption. Does the receiver have to be on all the time to remain associated with an access point? Are there reasonable techniques for powering down and periodically waking up while retaining a wifi connection?

Thank you,

Alyssa Chatten

  • 0
    Prodigy 220 points

    I'm sure you'd rather hear from a TI guy, but the answer to your questions are no to the 1st and yes to the 2nd.

    See...

    Technical Reference Manual; Literature Number: SWRU367A

    Page 26, SEC 1.3.4 General Purpose Timer (GPT)

    Note that if CC3200 is placed in deep sleep for more than 24 hours you will use battery as per the datasheet...

    Datasheet; Literature Number: SWAS032E

    Page 31, note 6

    The complete calibration can take up to 17 mJ of energy from the battery over a time of 24 ms . Calibration is performed sparingly, typically when coming out of Hibernate and only if temperature has changed by more than 20°C or the time elapsed from prior calibration is greater than 24 hours.

    And also page 35, section 4.10.2.3 Wakeup from Hibernate, note 1

    The other publication you will want is

    Programmer's Guide; Literature Number: SWRU369A

    If you cannot find these documents on the TI website I will send them to you as attachments if you email me at pkristament@gmail.com, but they aren't difficult to find.

    ciao

  • 0 in reply to Philip Kristament
    TI__Expert 5025 points

    Hi Alyssa,

    I would suggest you refer to the LPDS mode of operation and also the "idle_profile" example in the SDK (that demonstrates the LPDS operation). This example showcases being in LPDS while maintaining the connection with the AP.

    If it is ok to give up the connection with AP and lowest possible power consumption is the primary requirement, then HIBernate will be the choice.

    Best regards,

    Naveen