• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 567 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AFE4404 PWDN mode

Samuel Conti
Intellectual 510 points
Other Parts Discussed in Thread: AFE4404

Hello,

I try to use the PWDN mode of the AFE4404 to save power where HearRate is not needed in my application.

So I pull low the RESET_Z pin to enter PWDN mode and I pull high to go back in normal operation. I observe that I need to reinitialize the AFE4404 to work again. (I send again the value of each register).
 

Is it normal that I have to reinitialise the part ?

Maybe there are just a few registers to configure again and not all registers ?

Thank you,

Sam

  • 0
    TI__Mastermind 49906 points
    Hi Sam,

    After the device exits the hardware powerdown mode, the device has to be reinitialized.
    It is also recommended to issue a reset to the device before re-initializing it.

    If you do not wish to re-initialize the device, you could use the software power down mode using the PDNAFE register bit.
    This does not require the device to be re-initialized. However in this mode, the device consumes a quiescent current of about 40uA.

    Refer section 10 for the power supply sequencing, device init and HW/SW PDN timing.
  • 0 in reply to Praveen Aroul
    Intellectual 510 points
    Hi,

    I didn't see this section, sorry, so it's good with the software reste. Thank you very much.

    Best Regards