DocID026156 Rev 2

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AN4467

Power supplies

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Figure 4. Power supply supervisors

1. The PVD is available on all STM32L devices and it is enabled or disabled by software.

2. The BOR is available only on devices operating from 1.8 to 3.6 V, and unless disabled by option byte it

masks the POR/PDR threshold.

V

PVD output

100 mV

hysteresis

V

PVD

V

BOR

hyster esis

100 mV

IT enabled

BOR reset

(NRST)

POR/PDR reset

(NRST)

PVD

BOR always active

POR/PDR (BOR not available)

ai17211b

POR

V

/

PDR

V

BOR/PDR reset

(NRST)

BOR disabled by option byte

(Note 1)

(Note 2)

(Note 3)

(Note 4)