Brownout Reset (Bor); Programmable Voltage Detector (Pvd); Figure 13. Bor Thresholds - ST STM32F405 Reference Manual

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RM0090
5.2.2

Brownout reset (BOR)

During power on, the Brownout reset (BOR) keeps the device under reset until the supply
voltage reaches the specified V
V
is configured through device option bytes. By default, BOR is off. 3 programmable
BOR
V
threshold levels can be selected:
BOR
BOR Level 3 (VBOR3). Brownout threshold level 3.
BOR Level 2 (VBOR2). Brownout threshold level 2.
BOR Level 1 (VBOR1). Brownout threshold level 1.
Note:
For full details about BOR characteristics, refer to the "Electrical characteristics" section in
the device datasheet.
When the supply voltage (V
generated.
The BOR can be disabled by programming the device option bytes. In this case, the
power-on and power-down is then monitored by the POR/ PDR (see
on reset (POR)/power-down reset
The BOR threshold hysteresis is ~100 mV (between the rising and the falling edge of the
supply voltage).
VDD/VDDA
5.2.3

Programmable voltage detector (PVD)

You can use the PVD to monitor the V
selected by the PLS[2:0] bits in the
) drops below the selected V
DD
Reset
threshold.
BOR
(PDR)).

Figure 13. BOR thresholds

BOR threshold
power supply by comparing it to a threshold
DD
PWR power control register (PWR_CR) for
RM0090 Rev 18
Power controller (PWR)
threshold, a device reset is
BOR
Section 5.2.1: Power-
100 mV
hysteresis
MS30433V1
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