Datasheet

Functional overview STM32F722xx STM32F723xx
26/121 DocID028479 Rev 1
2.16 Voltage regulator
The regulator has four operating modes:
• Regulator ON
– Main regulator mode (MR)
– Low power regulator (LPR)
– Power-down
• Regulator OFF
2.16.1 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). 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.
The V
CAP_1
and V
CAP_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 V
CAP_1
pin is provided (on LQFP64 package)).
All the packages have the regulator ON feature.
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