1 Power management

AN1775

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1

Power management

1.1

Overview

All I/Os are 3V3-capable. An internal Voltage Regulator generates the supply voltage for core

following figure indicates the recommended configuration for the power supply pins:

Figure 1.

STR71x power supply pins

1.2

Power management block

The following figure describes the power management block implemented on the STR71x

devices.

Figure 2.

Power Management Block

The STR71x power management block has two regulators:

●

The Main Voltage Regulator MVR.

●

The Low Power Voltage Regulator LPVR.

Note the following remarks about the two regulators:

●

Both regulators can be switched-off by software

STR71x

GND

10µF

33nF

GND

1µF

GND

3V3

I/O circuitry

3.3 V

CORE

Main Voltage

Backup block

Low Power Voltage

1.8 V

switch

Regulator (LPVR)

Regulator (MVR)

see note 1

GND

10µF

33nF

GND

1µF

3V3