NRF52820-QDAA-R datasheet(44/437 Pages) NORDIC

44 / 437 page

5 Power and clock management

5.1 Power management unit (PMU)

Power and clock management in nRF52820 is designed to automatically ensure maximum power

efficiency.

The core of the power and clock management system is the power management unit (PMU) illustrated in

the following figure.

MCU

Internal

voltage

regulators

External

power sources

External

crystals

Internal

oscillators

PMU

CPU

Memory

Peripheral

Figure 8: Power management unit

The PMU automatically detects which power and clock resources are required by the different system

components at any given time. The PMU will then automatically start/stop and choose operation modes in

supply regulators and clock sources, to achieve the lowest power consumption possible.

5.2 Current consumption

Because the system is continually being tuned by the Power management unit (PMU) on page 44,

estimating an application's current consumption can be challenging when measurements cannot be

directly performed on the hardware. To facilitate the estimation process, a set of current consumption

scenarios are provided to show the typical current drawn from the VDD supply.

Each scenario specifies a set of operations and conditions applying to the given scenario. The following

table shows a set of common conditions used in all scenarios, unless otherwise stated in the description of

a given scenario. All scenarios are listed in Electrical specification on page 45.

4463_156 v1.0

NRF52820-QDAA-R Datasheet(PDF) 44 Page - Nordic Semiconductor