@dfarny ,
The VBAT pin is a pin on the STM32 processor designed to allow an external power source (battery, supercap) to sustain the processor's RTC and a portion of the onboard RAM when power to the processor is removed. As such, VBAT is an INPUT and does provide any charging capability whatsoever. You may want to refer to the following topics for more info:
Ok I am trying to figure out the pros and cons of VBAT and WKP in moving my design from the core to the photon.
In my current design I collect sensor data, transmit then enter DEEP_SLEEP (standby mode) for a long duration to save as much battery as possible. I wakeup either by the IWDG expiration that was set when entering sleep or via an external hardware reset to the RST pin and upon wakeup I have no memory of the past.
So I am looking at the STM32F205RGY6 Datasheet and trying to figure this…
OK, I plan on adding WiFi data connectivity to some new battery based products were building. Since these are battery based devices the less power the new Photon consumes the better.
@zach @peekay123 @BDub1 I’m curious if you guys have any data on power consumption figures for the new Photon?
If my memory serves me correct the Spark Core was consuming around 250ma @ 5v constantly.
I’m eager to see if its dropped or not.
I have seen a couple explanations so far. It works without software sleep modes, it only works with software sleep modes. Since my Photon has not yet arrived, I can’t test it, so lets get the scoop from the pros .
does it need any software sleep modes to work?
Does it “switch in” or just gradually start supplying power when needed?
VBAT does not supply power to charge the battery/Cap on the pin (you have to do that yourself)?
VBAT only provides power for the RTC and backup memory, the WI FI an…
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