STM32F732IE datasheet(31/226 Pages) STMICROELECTRONICS

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DS11854 Rev 6

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STM32F732xx STM32F733xx

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 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 Stop mode:

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.

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.

3.16.2

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 supplies externally a V12

voltage source through VCAP_1 and VCAP_2 pins.

Since the internal voltage scaling is not managed internally, the external voltage value must

be aligned with the targeted maximum frequency.The two 2.2 µF ceramic capacitors must

be replaced by two 100 nF decoupling capacitors.

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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