ULPM break even point

Wake from ULPM (Ultra Low Power Mode) uses about as much power as initial powerup. Does Sierra have any figures for the power “break even” point? For example, the length of time to remain in ULPM to avoid using more power than if ULPM was not used at all. The FX30 is of primary concern.

Hi @dpinc
According to your description, do you want to know how to set the time in ULPM for FX30 device? If yes, please refer to below:

The FX30 can be waked up by Timer by below commands:
at!powerwake=1,300 ← this means that device will stay in ULPM for 300s
The maximun time for staying in ULPM is 3456000 seconds.

If above is not your target, could you please share with me more detail about your question ?


Hi @jerdung

Thanks for the reply. Sorry I was not clear. As an example, the image below captures typical power consumption during transition into/out of ULPM.

In order to get to the low consumption (#8), power budget incurs cost of #1-#7. So, for the overall power budget to see any benefit from ULPM, the module must remain in ULPM for some period of time before any net power savings is realized. Otherwise, more power is consumed entering and existing ULPM than is saved by actually being in ULPM.

My question is: what calculations can Sierra can share as to the break even point at which ULPM becomes beneficial as opposed to detrimental to the net power budget?

This is important for power critical applications especially since eDRX and PSM are not supported. Any input from Sierra?

Hi @dpinc ,
For your concern here, we should need more analysis to identify whether we have the issue here. Please email tech support: support@sierrawireless.com for further deeper support.


I confirm PSM and eDRX are not supported in Octave currently, and ULPM management will be changed in the next release (FW3.5.x): wake up sources from ULPM through GPIO and ADC will be removed, we will keep only the possibility to wake up from ULPM through timers (to be configured in the device through Octave).