Reset And Power Supply Supervisor; Power-On Reset (Por) / Power-Down Reset (Pdr) - ST STM32F0 Series Application Note

AN4080
1.2

Reset and power supply supervisor

1.2.1

Power-on reset (POR) / power-down reset (PDR)

The device has an integrated power-on reset (POR) and power-down reset (PDR) circuits
which are always active and ensure proper operation above a threshold of 2 V.
The device remains in Reset mode when the monitored supply voltage is below a specified
threshold, V
●
The POR monitors only the V
arrive first and be greater than or equal to V
●
The PDR monitors both the V
supply supervisor can be disabled (by programming a dedicated option bit
V
DDA_MONITOR
V
DDA
For more details on the power on / power down reset threshold, refer to the electrical
characteristics section in the datasheet.
Figure 3.
Reset
, without the need for an external reset circuit.
POR/PDR
) to reduce the power consumption if the application design ensures that
is higher than or equal to V
Power on reset/power down reset waveform
V /V
DD DDA
V
POR
Doc ID 023035 Rev 2
Power supplies of the STM32F05xxx family
supply voltage. During the startup phase V
DD
DD.
and V supply voltages. However, the V
DD DDA
.
DD
40 mV
hysteresis
Temporization
t
RSTTEMPO
must
DDA
power
DDA
V
PDR
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