EnergyMicro EFM32G232低功耗32位MCU开发方案

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EnergyMicro EFM32G232低功耗32位MCU开发方案

2011-07-19 14:49:24 来源：中电网点击：1138

摘要： 本文介绍了EFM32 Gecko系列主要特性，方框图和EFM32-G2XX-DK开发板主要特性与详细的电路图.

关键字： 微控制器， 处理器， 安防系统， 健身设备

低功耗微控制器(Energy Micro)公司的32位处理器EFM32 Gecko系列产品采用ARM Cortex-M3内核，工作频率高达32MHz.系列产品具有低电流特性，配合2µs的唤醒时间，使其至少增加了4倍的电池使用寿命。启动模式下从闪存FLASH执行代码所消耗的典型电流为160µA/MHz、深度睡眠模式和关断模式下分别为900nA和20nA。主要用在不断发展的智能仪表市场和对功耗敏感的应用，如楼宇自动化、安防系统和便携式健康医疗及健身设备。本文介绍了EFM32 Gecko系列主要特性，方框图和EFM32-G2XX-DK开发板主要特性与详细的电路图.

The EFM32 MCUs are the world’s most energy friendly microcontrollers. With a unique combination of the powerful 32-bit ARM Cortex-M3， innovative low energy techniques， short wake-up time from energy saving modes， and a wide selection of peripherals， the EFM32G microcontroller is well suited for any battery operated application as well as other systems requiring high performance and low-energy consumption.

This section gives a short introduction to each of the modules in general terms and also and shows a summary of the configuration for the EFM32G232 devices.

The ARM Cortex-M3 includes a 32-bit RISC processor which can achieve as much as 1.25 Dhrystone MIPS/MHz. A Memory Protection Unit with support for up to 8 memory segments is included， as well as a Wake-up Interrupt Controller handling interrupts triggered while the CPU is asleep.

EFM32 Gecko系列主要特性:

ARM Cortex-M3 CPU platform

High Performance 32-bit processor @ up to 32 MHz

Memory Protection Unit

Wake-up Interrupt Controller

Flexible Energy Management System

20 nA @ 3 V Shutoff Mode

0.6 μA @ 3 V Stop Mode， including Power-on Reset， Brown-out Detector， RAM and CPU retention

0.9 μA @ 3 V Deep Sleep Mode， including RTC with 32.768 kHz oscillator， Power-on Reset， Brown-out Detector， RAM and CPU retention

45 μA/MHz @ 3 V Sleep Mode

180 μA/MHz @ 3 V Run Mode， with code executed from flash

128/64/32 KB Flash

16/16/8 KB RAM

53 General Purpose I/O pins

Configurable Push-pull， Open-drain， pull-up/down， input filter， drive strength

Configurable peripheral I/O locations

16 asynchronous external interrupts

8 Channel DMA Controller

8 Channel Peripheral Reflex System for autonomous inter-peripheral signaling

Hardware AES with 128/256-bit keys in 54/75 cycles

Timers/Counters

3× 16-bit Timer/Counter

3×3 Compare/Capture/PWM channels

Dead-Time Insertion on TIMER0

16-bit Low Energy Timer

24-bit Real-Time Counter

3× 8-bit Pulse Counter

Watchdog Timer with dedicated RC oscillator @ 50 nA

Communication interfaces

3× Universal Synchronous/Asynchronous Receiver/Transmitter

UART/SPI/SmartCard (ISO 7816)/IrDA

Triple buffered full/half-duplex operation

2× Low Energy UART

Autonomous operation with DMA in Deep Sleep Mode

I2C Interface with SMBus support

Address recognition in Stop Mode

Ultra low power precision analog peripherals

12-bit 1 Msamples/s Analog to Digital Converter

8 single ended channels/2 differential channels

On-chip temperature sensor

Conversion tailgating for predictable latency

12-bit 500 ksamples/s Digital to Analog Converter

2× Analog Comparator

Capacitive sensing with up to 16 inputs

Supply Voltage Comparator

Ultra efficient Power-on Reset and Brown-Out Detector

Pre-Programmed Serial Bootloader

Temperature range -40 to 85 ºC

Single power supply 1.8 to 3.8 V

LQFP64 package

图1. EFM32 Gecko系列方框图

EFM32-G2XX-DK开发板

The EFM32-G2XX-DK is a highly flexible development kit. It offers many features and peripherals to the EFM32 through jumperless configuration. The different features on the kit are available as configured in the motherboard’s Board Controller. Configuration is easily done by a simple API in the kit Board Support Package.

If none of the motherboard features are needed， configuration of the Board Controller is not necessary.

All EFM32 GPIO pins are available on the prototyping board.

EFM32-G2XX-DK开发板主要特性:

Advanced Energy Monitoring system for precise current tracking.

Special hardware configuration for isolation of the MCU power domain.

Replaceable prototyping board for quick custom application development.

Full feature USB debugger / emulator with debug out functionality.

3.5-inch TFT-LCD 320x240 pixel RGB color display.

Board Controller for board configuration / signal routing.

Single ended and differential ADC inputs.

Line-in stereo audio input amplifier.

Line-out stereo audio output amplifier.