NRF9160-SIBA-R datasheet(48/400 Pages) NORDIC

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5 Power and clock management

5.1 Functional description

The power and clock management system automatically ensures maximum power efficiency.

The nRF9160 provides a total of three power modes; two internal (automatically handled by the device),

and one external (driven by the ENABLE pin and overriding internal ones).

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

in the image below.

nRF9160

Power

management

(PMIC)

Clock

sources

PMU

Application core

Memory

Peripherals

LTE

modem

VDD

ENABLE

Figure 8: Power management unit

When the device is powered and enabled, the PMU automatically tracks the power and clock resources

required by the different components in the system. It then starts/stops and chooses operation modes in

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

possible.

5.1.1 Power management

The two internal modes are handled by the power management unit (PMU) , whereas the external is

handled by the user via the ENABLE pin.

The System Disabled mode provides a way to override the PMU by manipulating voltages presented to the

ENABLE pin.

The PMU steers system-wide clock and power in order to provide the power modes - System ON and

System OFF. Under the various modes, internal blocks are automatically powered by the PMU as required

by the application.

5.1.1.1 System Disabled mode

The entire device can be powered down by presenting the appropriate voltage to the externally available

ENABLE pin.

4418_1315 v2.0

NRF9160-SIBA-R Datasheet(PDF) 48 Page - Nordic Semiconductor