EFM32GG11 datasheet(12/261 Pages) SILABS

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3.2 Power

The EFM32GG11 has an Energy Management Unit (EMU) and efficient integrated regulators to generate internal supply voltages. Only

a single external supply voltage is required, from which all internal voltages are created. A 5 V regulator is available on some OPNs,

allowing the device to be powered directly from 5 V power sources, such as USB. An optional integrated DC-DC buck regulator can be

utilized to further reduce the current consumption. The DC-DC regulator requires one external inductor and one external capacitor.

The EFM32GG11 device family includes support for internal supply voltage scaling, as well as two different power domain groups for

peripherals. These enhancements allow for further supply current reductions and lower overall power consumption.

AVDD and VREGVDD need to be 1.8 V or higher for the MCU to operate across all conditions; however the rest of the system will

operate down to 1.62 V, including the digital supply and I/O. This means that the device is fully compatible with 1.8 V components.

Running from a sufficiently high supply, the device can use the DC-DC to regulate voltage not only for itself, but also for other PCB

components, supplying up to a total of 200 mA.

3.2.1 Energy Management Unit (EMU)

The Energy Management Unit manages transitions of energy modes in the device. Each energy mode defines which peripherals and

features are available and the amount of current the device consumes. The EMU can also be used to turn off the power to unused RAM

blocks, and it contains control registers for the DC-DC regulator and the Voltage Monitor (VMON). The VMON is used to monitor multi-

ple supply voltages. It has multiple channels which can be programmed individually by the user to determine if a sensed supply has

fallen below a chosen threshold.

3.2.2 DC-DC Converter

The DC-DC buck converter covers a wide range of load currents and provides up to 90% efficiency in energy modes EM0, EM1, EM2

and EM3, and can supply up to 200 mA to the device and surrounding PCB components. Protection features include programmable

current limiting, short-circuit protection, and dead-time protection. The DC-DC converter may also enter bypass mode when the input

voltage is too low for efficient operation. In bypass mode, the DC-DC input supply is internally connected directly to its output through a

low resistance switch. Bypass mode also supports in-rush current limiting to prevent input supply voltage droops due to excessive out-

put current transients.

3.2.3 5 V Regulator

A 5 V input regulator is available, allowing the device to be powered directly from 5 V power sources such as the USB VBUS line. The

regulator is available in all energy modes, and outputs 3.3 V to be used to power the USB PHY and other 3.3 V systems. Two inputs to

the regulator allow for seamless switching between local and external power sources.

EFM32GG11 Family Data Sheet

System Overview

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EFM32GG11 Datasheet(PDF) 12 Page - Silicon Laboratories