we are evaluating the WP76xx module and we have a few questions regarding the sleep mode and others. We don’t have a board to test with.
What we are trying to figure out is:
- We want to use as minimal power as possible, because the system will run on battery
- We need to send around 20 MB every half hour
- We want to be registered with the network to not waste power for connection to it
- We need to respond fast to events, so either booting fast or suspend/sleep enough to not waste energy
So here are our questions:
For sleep mode, the PTS says: “Application core is sleeping”
Q1: Is this suspend to RAM or suspend to disc (flash)?
Q2: Is the SDRAM ON while the app core is sleeping (is the data retained)?
Q3: how long does it take to wake up from sleep?
Q4: we assume that the app core doesn’t have to boot when waking up - is this correct?
Q5: is it possible to set the app core to sleep AND use the PSM TAU timer to wake it up?
We don’t need USB, since this will be a standalone product.
Q6: is it possible to disable USB completely?
Q7: if yes - how much power will be saved?
We read that the boot time is around 15 to 20 seconds
Q8: how much can this be reduced?
The PTS is very sparse on information. Are there any application notes regarding:
Q9: power saving?
Q10: sleep modes?
Q11: in general?
Thanks in advance,