EFM32WG Datasheet, PDF(111/834 Page) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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EFM32WG Datasheet, PDF (111/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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...the world's most energy friendly microcontrollers

Table 10.3. EMU Wakeup Triggers from Low Energy Modes

Peripheral

Wakeup Trigger

RTC

Any enabled interrupt

USART

Receive / transmit

UART

Receive / transmit

LEUART

Receive / transmit

LESENSE

I2C

I2C

Any enabled interrupt

Any enabled interrupt

Receive address recognition

TIMER

Any enabled interrupt

LETIMER

Any enabled interrupt

CMU

Any enabled interrupt

DMA

Any enabled interrupt

MSC

Any enabled interrupt

DAC

Any enabled interrupt

ADC

Any enabled interrupt

AES

Any enabled interrupt

PCNT

Any enabled interrupt

LCD

Any enabled interrupt

ACMP

Any enabled edge interrupt

VCMP

Any enabled edge interrupt

Pin interrupts

Asynchronous

Pin

Reset

EM4 wakeup on supported

pins

Asynchronous

Backup RTC

Any enabled interrupt

Power

Cycle Off/On

1Energy Mode 0/Active Mode

2Energy mode 1/2/3/4

3When the 1 kHz ULFRCO is selected

4When using an external clock

EM01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Yes

EM12

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

-

Yes

Yes

EM22

Yes

-

-

Yes

Yes

-

Yes

-

Yes

-

-

-

-

-

-

Yes

Yes

Yes

Yes

Yes

Yes

-

Yes

Yes

EM32

Yes3

-

-

-

Yes3

-

Yes

-

Yes3

-

-

-

-

-

-

Yes4

-

Yes

Yes

Yes

Yes

-

Yes

Yes

EM42

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Yes

Yes

Yes

Yes

10.3.4 Backup power domain

10.3.4.1 Introduction

The EFM32WG has the possibility to be partly powered by a backup battery. The backup power input,

BU_VIN, is connected to a power domain in the EFM32WG containing the Backup RTC and 512 bytes

of data retention, available in all energy modes. Figure 10.3 (p. 112) shows an overview of the backup

powering scheme. During normal operation, the entire chip is powered by the main power supply. If the

main power supply drains out and the Backup mode functionality is enabled, the system enters a low

energy mode, equivalent to EM4, and automatically switches over to the backup power supply.

2013-05-08 - Wonder Gecko Family - d0233_Rev0.50

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