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STM32F031 low voltage reset - bootloader boot0 pin

Question asked by Gregory Holcomb on Sep 9, 2017
Latest reply on Sep 11, 2017 by Vangelis Fortounas

I have two micros communicating over SPI bus, one is a STM32F031 running application code.  I can interrogate the STM32F031 for its firmware version and if it is not the correct version I power off its 3.3 volts, raise the boot0 pin and power it back up into bootloader and transfer the correct version firmware using UART from one micro to the other over UART.  

For testing purposes I need to know about low voltage reset.  What voltage I must drop 3.3 volts to and for how long in order to guarantee a check of check of boot0 and entrance into the bootloader.  Are these volts/timings specified, or what would be reasonable?