Power controller (PWR) RM0402
90/1163 RM0402 Rev 6
Note: For more details, refer to the voltage regulator section in the STM32F412xx datasheet.
5.2 Power supply supervisor
5.2.1 Power-on reset (POR)/power-down reset (PDR)
The device has an integrated POR/PDR circuitry that allows proper operation starting
from 1.8 V.
To use the device below 1.8 V, the internal power supervisor must be switched off using the
PDR_ON pin (please refer to section Power supply supervisor of the STM32F412xx
datasheet). The device remains in Reset mode when V
DD
/V
DDA
is below a specified
threshold, V
POR/PDR
, without the need for an external reset circuit. For more details
concerning the power on/power-down reset threshold, refer to the electrical characteristics
of the datasheet.
Figure 9. Power-on reset/power-down reset waveform
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
BOR
threshold.
V
BOR
is configured through device option bytes. By default, BOR is off. 3 programmable
V
BOR
threshold levels can be selected:
• 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.
VDD/VDDA
40 mV
hysteresis
PDR
PDR
MS30431V1
Reset
Temporization
tRSTTEMPO
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