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Normal mode: In this mode, 1.3V power supply area operates at full
power, and the level of the output voltage can be selected through
VOSSEL bit of the register PMU_CTRL.
Stop mode: In this mode, 1.3V power supply area works in low-power
state, all clocks are off, peripherals stop working and the set voltage
output level remains unchanged.
Standby mode: In this mode, the 1.3V power supply area stops power
supply, and except for the standby circuit, the content of register and
SRAM will be lost
V
DDA
power domain
Power the ADC, DAC, HSICLK, LSICLK, PLL and reset module through
V
DDA
/V
SSA
and V
REF+
/V
REF-
pins.
Independent ADC power supply and reference voltage
Independent ADC power supply can improve conversion accuracy, and the
specific power pins are as follows:
V
DDA
: Power pin of ADC
V
SSA
: Independent power ground pin
V
REF+
/V
REF-
: ADC reference voltage pin
1.3V power domain
The core, Flash, SRAM and digital peripherals are powered by voltage
regulator.
Backup power domain
When V
DD
exists, the backup power supply area is powered by V
DD
. When V
DD
is powered down, the backup power supply area is powered by V
BAT
, which is
used to save the content of backup register and maintain RTC function. Power
the LSECLK crystal oscillator, RTC, backup register, backup SRAM, PC13,
PC14, PC15, P18 (only APM32F407IE/IG has such pin) and wake-up logics.
Power Management
Power-on/power-down reset (POR and PDR)
When the V
DD
/V
DDA
is detected to be lower than the threshold voltage V
POR
and
V
PDR,
the chip will automatically maintain the reset state. The waveform
diagrams of power-on reset and power-down reset are as follows. For POR,
PDR, hysteresis voltage and hysteresis time, please refer to the "Datasheet".