3v3 during hibernation

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garzola
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3v3 during hibernation

Hi,
I want to go in hibernation mode and keep the 3.3V active because I have a device that must be alive, is that possible ? and if yes , how can I do ?

thanks

MArco

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PM_Dialog
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Joined: 2018-02-08 11:03
Hi garzola,

Hi garzola,

Could you please clarify your question? Do you mean to use the V33 pin of the DA1468x in order to power up an external device since the chip is hibernation mode? If you mean that, please read the 4. Power management section of the DA14680datasheet and Figure 8: Power management unit block diagram. You will see that in hibernation mode (red color) the V33 is off.

Thanks, PM_Dialog

garzola
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hi, yes

hi, yes

I wanted to do that , powerig up an external device with 3v3 while in hibernation mode.
I read Sw platform Reference and in chapter 9.4 :

"The 3.3V output can be driven by the LDO_ret (low power, low driving strength) or the
LDO_VBAT_RET (high driving strength but resampling is required periodically to keep the correct
voltage level, which increases power consumption)."

I thought it was possibile...table 9 says
I V33_SLEEP -> Current drawn from pin by external devices

I need to be woken up by an externa device...no way ?

PM_Dialog
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Hi garzola,

Hi garzola,

You are not able to power the external device via V33 since the DA1468x is in hibernation mode. In hibernation mode only the blocks which cause asynchronous events are open, and you are able to wake-up asynchronous0ly only either from Wake-up controller or from the VBAS interrupt (plug an usb cable for example). You can wake up only from these two events because according to the block diagram are ON (red color). Be ware that the hibernation mode is for shipping scope and not for development scope.

Thanks, PM_Dialog