STM32F756VG Datasheet, PDF (27/228 Pages) STMicroelectronics – Up to 25 communication interfaces

STM32F756xx
Functional overview
2.18.2
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 V_{CAP_1} and V_{CAP_2} pin.
All packages have the regulator ON feature.
Table 3. Voltage regulator configuration mode versus device operating mode⁽¹⁾
Voltage regulator
configuration
Run mode
Sleep mode
Stop mode
Standby mode
Normal mode
MR
Over-drive
mode⁽²⁾
MR
Under-drive mode
-
Power-down mode
-
MR
MR or LPR
-
MR
-
-
-
MR or LPR
-
-
-
Yes
1. ‘-’ means that the corresponding configuration is not available.
2. The over-drive mode is not available when V_DD = 1.7 to 2.1 V.
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 V_{CAP_1} and V_{CAP_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.
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