GigaDevice Semiconductor GD32VF103 - 3 Power Management Unit (PMU); Characteristics; Figure 3-1. Power Supply Overview; Function Overview

GD32VF103 User Manual
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3. Power management unit (PMU)
3.1. Overview
The power consumption is regarded as one of the most important issues for the devices of
GD32VF103 series. According to the Power management unit (PMU), provides three types
of power saving modes, including Sleep, Deep-sleep and Standby mode. These modes
reduce the power consumption and allow the application to achieve the best tradeoff among
the conflicting demands of CPU operating time, speed and power consumption. For
GD32VF103 devices, there are three power domains, including V
DD
/V
DDA
domain, 1.2V
domain, and Backup domain, as is shown in Figure 3-1. Power supply overview. The power
of the V
DD
domain is supplied directly by V
DD
. An embedded LDO in the V
DD
/V
DDA
domain is
used to supply the 1.2V domain power. A power switch is implemented for the Backup domain.
It can be powered from the V
BAT
voltage when the main V
DD
supply is shut down.
3.2. Characteristics
 Three power domains: V
BAK
, V
DD
/V
DDA
and 1.2V power domains.
 Three power saving modes: Sleep, Deep-sleep and Standby modes.
 Internal Voltage regulator (LDO) supplies around 1.2V voltage source for 1.2V domain.
 Low Voltage Detector can issue an interrupt or event when the power is lower than a
programmed threshold.
 Battery power (V
BAT
) for Backup domain when V
DD
is shut down.
 LDO output voltage select for power saving.
3.3. Function overview
Figure 3-1. Power supply overview provides details on the internal configuration of the PMU
and the relevant power domains.