STM32F446RC datasheet(25/201 Pages) STMICROELECTRONICS

25 / 201 page

DocID027107 Rev 5

25/201

STM32F446xC/E

Functional overview

There are three power modes configured by software when the regulator is ON:

•

MR mode used in Run/sleep modes or in Stop modes

–

In Run/Sleep mode

The MR mode is used either in the normal mode (default mode) or the over-drive

mode (enabled by software). Different voltages scaling are provided to reach the

best compromise between maximum frequency and dynamic power consumption.

The over-drive mode allows operating at a higher frequency than the normal mode

for a given voltage scaling.

–

In Stop modes

The MR can be configured in two ways during stop mode:

MR operates in normal mode (default mode of MR in stop mode)

MR operates in under-drive mode (reduced leakage mode).

•

LPR is used in the Stop modes:

The LP regulator mode is configured by software when entering Stop mode.

Like the MR mode, the LPR can be configured in two ways during stop mode:

–

LPR operates in normal mode (default mode when LPR is ON)

–

LPR operates in under-drive mode (reduced leakage mode).

•

Power-down is used in Standby mode.

The Power-down mode is activated only when entering in Standby mode. The regulator

output is in high impedance and the kernel circuitry is powered down, inducing zero

consumption. The contents of the registers and SRAM are lost.

Refer to Table 3 for a summary of voltage regulator modes versus device operating modes.

Two external ceramic capacitors should be connected on VCAP_1 and VCAP_2 pin.

All packages have the regulator ON feature.

3.17.2

Regulator OFF

This feature is available only on packages featuring the BYPASS_REG pin. The regulator is

disabled by holding BYPASS_REG high. The regulator OFF mode allows to supply

externally a V12 voltage source through VCAP_1 and VCAP_2 pins.

Table 3. Voltage regulator configuration mode versus device operating mode(1)

1. ‘-’ means that the corresponding configuration is not available.

Voltage regulator

configuration

Run mode

Sleep mode

Stop mode

Standby mode

Normal mode

MR or LPR

Over-drive

mode(2)

2. The over-drive mode is not available when VDD = 1.7 to 2.1 V.

Under-drive mode

MR or LPR

Power-down

mode

Yes

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