I was interested to learn more about the Swan ability to power down external peripherals. After reading the following I have some questions.
Power can come from either the USB port or a battery. There is an onboard regulator that software can switch off, making it easy to power down external peripherals. This regulator outputs up to two amps. Once the STM32 turns off external devices and goes into a low-power mode, Swan only draws eight microamps!
Thinking about battery operated low power sensor devices.
Is the STM32 powered from the same regulator ? i.e. can you power down a sensor without powering down the STM32 ?
Is the STM32 powered directly from the VIN pin ?
Is the regulator output made available on the 3.3V pin ?