STM32F769AI datasheet(32/255 Pages) STMICROELECTRONICS

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Functional overview

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DocID029041 Rev 4

•

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.

2.19.2

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.

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 should

be replaced by two 100 nF decoupling capacitors.

When the regulator is OFF, there is no more internal monitoring on V12. An external power

supply supervisor should be used to monitor the V12 of the logic power domain. PA0 pin

should be used for this purpose, and act as power-on reset on V12 power domain.

In the regulator OFF mode, the following features are no more supported:

•

PA0 cannot be used as a GPIO pin since it allows to reset a part of the V12 logic power

domain which is not reset by the NRST pin.

•

As long as PA0 is kept low, the debug mode cannot be used under power-on reset. As

a consequence, PA0 and NRST pins must be managed separately if the debug

connection under reset or pre-reset is required.

•

The over-drive and under-drive modes are not available.

•

The Standby mode is not available.

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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