NRF52811-QFAA-R7 datasheet(42/444 Pages) NORDIC

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5 Power and clock management

5.1 Power management unit (PMU)

Power and clock management in nRF52811 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

Power management unit on page 42.

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

components in the system at any given time. It will then start/stop and choose operation modes in supply

regulators and clock sources, without user interaction, to achieve the lowest power consumption possible.

5.2 Current consumption

As the system is being constantly tuned by the Power management unit (PMU) on page 42, estimating

the current consumption of an application can be challenging if the designer is not able to perform

measurements directly 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. Current

consumption scenarios, common conditions on page 43 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 43.

4454_140 v1.0

NRF52811-QFAA-R7 Datasheet(PDF) 42 Page - Nordic Semiconductor