Power controller (PWR) RM0090
95/1422 Doc ID 018909 Rev 4
The BOR threshold hysteresis is ~100 mV (between the rising and the falling edge of the
supply voltage).
Figure 10. BOR thresholds
5.2.3 Programmable voltage detector (PVD)
You can use the PVD to monitor the V
DD
power supply by comparing it to a threshold
selected by the PLS[2:0] bits in the PWR power control register (PWR_CR) for
STM32F405xx/07xx and STM32F415xx/17xx and PWR power control register (PWR_CR)
for STM32F42xxx and STM32F43xxx.
The PVD is enabled by setting the PVDE bit.
A PVDO flag is available, in the PWR power control/status register (PWR_CSR), to indicate
if V
DD
is higher or lower than the PVD threshold. This event is internally connected to the
EXTI line16 and can generate an interrupt if enabled through the EXTI registers. The PVD
output interrupt can be generated when V
DD
drops below the PVD threshold and/or when
V
DD
rises above the PVD threshold depending on EXTI line16 rising/falling edge
configuration. As an example the service routine could perform emergency shutdown tasks.
MS30432V1
VDD/VDDA
100 mV
hysteresis
BOR threshold
Reset
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