GigaDevice Semiconductor GD32F3x0 - Power Management Unit (PMU); Overview; Characteristics; Function Overview

GD32F3x0 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
GD32F3x0 series. 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 GD32F3x0
series, 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 (LVD) 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.
 Ultra power saving for low-driver mode in Deep-sleep mode. And high-driver mode for
high frequency.
3.3. Function overview
Figure 3-1. Power supply overview provides details on the internal configuration of the
PMU and the relevant power domains.