STM32F730V8 datasheet(31/202 Pages) STMICROELECTRONICS

31 / 202 page

DS12536 Rev 2

31/202

STM32F730x8

Functional overview

3.16

Voltage regulator

The regulator has four operating modes:

•

Regulator ON

–

Main regulator mode (MR)

–

Low power regulator (LPR)

–

Power-down

•

Regulator OFF

3.16.1

Regulator ON

On packages embedding the BYPASS_REG pin, the regulator is enabled by holding

BYPASS_REG low. On all other packages, the regulator is always enabled.

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 modes

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

mode (enabled by software). A different voltage scaling is 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.

The VCAP_1 and VCAP_2 pins must be connected to 2*2.2 µF, ESR < 2 Ω (or 1*4.7 µF, ESR

between 0.1 Ω and 0.2 Ω if only the VCAP_1 pin is provided (on LQFP64 package)).

All the packages have the regulator ON feature.

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