Power management unit (PMU)

Power and clock management in nRF52840 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.

Figure 1. Power management unit
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.