There are 3 low power modes available with the STM32F446RE:
Sleep
Stop
Standby
Sleep doesn't have a low enough current consumption (Sleep = 51mA, Stop = 0.2mA).
Standby requires using the WKUP pin (which is not used currently), RTC, IWDG or NRST. None of those fit this application either.
Stop seems to be the best for this application.
In Stop, the device can be woken up using any EXTI line.
This could be configured to be one of the digital inputs (at the DT connector) or CAN traffic.
There are 3 low power modes available with the STM32F446RE:
Sleep doesn't have a low enough current consumption (Sleep = 51mA, Stop = 0.2mA). Standby requires using the WKUP pin (which is not used currently), RTC, IWDG or NRST. None of those fit this application either.
Stop seems to be the best for this application. In Stop, the device can be woken up using any EXTI line. This could be configured to be one of the digital inputs (at the DT connector) or CAN traffic.