Power supply

AN2857

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Doc ID 15241 Rev 3

2.4

Voltage regulator

After reset, the MVR provides the 1.8 V to the internal digital parts of the microcontroller.

Depending on the functioning mode, the MVR can be switched off at which time the LPVR

provides the 1.8 V. For example:

●

In run and wait mode, only the MVR provides the 1.8 V. The LPVR cannot be used in

run mode.

●

In active halt mode, during the halt phase, either the MVR or the LPVR can provide the

1.8 V. The user can select which regulator to be used.

●

In halt mode, the LPVR is automatically used. The MVR cannot be used in halt mode.