Ember 公司的EM260是ZigBee/802.15.4 網(wǎng)絡(luò)處理器,它集成了2.4GHz, IEEE 802.15.4兼容的收發(fā)器和16位網(wǎng)絡(luò)處理器(XAP2b內(nèi)核),用以運(yùn)行ZigBee兼容的網(wǎng)絡(luò)堆棧EmberZNet.收發(fā)器的RX靈敏度為-99dBm,正常輸出功率為+2.5dBm.EM260目標(biāo)應(yīng)用為建筑物自動(dòng)化和控制,家庭自動(dòng)化和控制,家庭娛樂控制以及資產(chǎn)跟蹤.本文介紹了EM260的主要特性,方框圖,典型應(yīng)用電路和所用的材料清單.此外還介紹了Ember EM260 SPI/UART 128kB開發(fā)板的主要特性和詳細(xì)電路圖,包括電源分布和各種電路, 主微控制器, 信號(hào)流程圖, SPI/UART和USB/DEI 邏輯以及USB, DEI, 和TTL 外接口電路圖.

EM260: ZigBee/802.15.4 Network Processor

The EM260 integrates a 2.4GHz, IEEE 802.15.4-compliant transceiver with a 16-bit network processor (XAP2b core) to run EmberZNet, the Ember ZigBee-compliant network stack. The EM260 exposes access to the EmberZNet API across a standard SPI module or a UART module, allowing application development on a Host platform. This means that the EM260 can be viewed as a ZigBee peripheral connected over a serial interface. The XAP2b microprocessor is a power-optimized core integrated in the EM260. It contains integrated Flash and RAM memory along with an optimized peripheral set to enhance the operation of the network stack.

The transceiver utilizes an efficient architecture that exceeds the dynamic range requirements imposed by the IEEE 802.15.4-2003 standard by over 15dB. The integrated receive channel filtering allows for co-existence with other communication standards in the 2.4GHz spectrum such as IEEE 802.11g and Bluetooth. The integrated regulator, VCO, loop filter, and power amplifier keep the external component count low. An optional high-performance radio mode (boost mode) is software selectable to boost dynamic range by a further 3dB.

The EM260 contains embedded Flash and integrated RAM for program and data storage. By employing an effective wear-leveling algorithm, the stack optimizes the lifetime of the embedded Flash, and affords the application the ability to configure stack and application tokens within the EM260.

To maintain the strict timing requirements imposed by ZigBee and the IEEE 802.15.4-2003 standard, the EM260 integrates a number of MAC functions into the hardware. The MAC hardware handles automatic ACK transmission and reception, automatic backoff delay, and clear channel assessment for transmission, as well as automatic filtering of received packets. In addition, the EM260 allows for true MAC level debugging by integrating the Packet Trace Interface.

An integrated voltage regulator, power-on-reset circuitry, sleep timer, and low-power sleep modes are available. The deep sleep and power down modes draw less than 1μA, allowing products to achieve long battery life.

Finally, the EM260 utilizes the non-intrusive SIF module for powerful software debugging and programming of the network processor.

EM260主要特性:

Integrated 2.4GHz, IEEE 802.15.4-compliant transceiver:

Robust RX filtering allows co-existence with IEEE 802.11g and Bluetooth devices

- 99dBm RX sensitivity (1% PER, 20byte packet)

+ 2.5dBm nominal output power

Increased radio performance mode (boost mode) gives – 100dBm sensitivity and + 4.5dBm transmit power

Integrated VCO and loop filter

Secondary TX-only RF port for applications requiring external PA.
    
Integrated IEEE 802.15.4 PHY and MAC

Ember ZigBee-compliant stack running on the dedicated network processor

Controlled by the Host using the EmberZNet Serial Protocol (EZSP)

Standard SPI or UART Interfaces allow for connection to a variety of Host microcontrollers
    
Non-intrusive debug interface (SIF)

Integrated hardware and software support for InSight Development Environment

Dedicated peripherals and integrated memory

Provides integrated RC oscillator for low power operation

Three sleep modes:
    
Processor idle (automatic)

Deep sleep—1.0μA

Power down—1.0μA
    
Watchdog timer and power-on-reset circuitry

Integrated AES encryption accelerator

Integrated 1.8V voltage regulator

EM260目標(biāo)應(yīng)用:

Building automation and control

Home automation and control

Home entertainment control

Asset tracking



圖1.EM260 方框圖



圖2.用于SPI協(xié)議的典型應(yīng)用電路圖

材料清單(BOM):



Ember EM260 SPI/UART 128kB開發(fā)板

The Ember EM260 SPI/UART 128kB Breakout Board contains the hardware stimulus for the development and deployment of a low-data-rate, low-power ZigBee application on a host microcontroller (with 128kB of Flash) communicating with the EM260 SPI/UART radio communication module (RCM). The Breakout Board allows for either a SPI or UART interface to the EM260, selectable via a toggle switch. The four-layer (FR4) Breakout Board features an Atmel host microcontroller (ATmega128L), a temperature sensor, two application buttons, a piezo buzzer, two application LEDs, and a 2吋″ x 2.6″ through-hole prototyping area. In addition, it contains a USB interface, InSight data emulation interface, regulated power planes with indicator LEDs, and direct attachment to the EM260 SPI/UART RCM. These features allow for proper development of an EM260 application.

The EM260 SPI/UART 128kB Breakout Board offers:

Host microcontroller, ATmega128L from Atmel, with 128kB Flash and 8kB RAM

AVR ISP and JTAG shrouded connectors for programming and debug

Configurable hardware support for application development

Temperature sensor

Two buttons

Piezo buzzer

Two LEDs

Selectable USB connector with RS-232 transceiver

EM260 SPI/UART RCM reset button

Host microcontroller reset button

Host microcontroller bootload button

2″x 2.6″, 0.1″pitch prototyping area

26-pin, 0.1″pitch, single-row header for access to all host GPIO signals

2 6-pin, 0.1″pitch, single-row EM260 SPI/UART RCM connectors

2 6-pin, 0.1″pitch, single-row headers for access to EZSP signals

9-pin, 0.1″pitch, single-row header footprint for access to 3.3V TTL-compliant
UART signals

26-pin, low-profile InSight data emulation interface with configuration header

Automatic DC power source selection (12V DC wall wart, 5V USB bus power, or AAA
battery pack)

Power indicator LEDs for 12V DC wall wart, 5V USB bus power, and board power

Jumper separation of module and board power for accurate module current measurements

The following figures illustrate the schematic of the EM260 SPI/UART 128kB Breakout Board (0471 Version A0). Use these schematics when developing your application.



圖3.EM260 SPI/UART 128kB開發(fā)板電路圖(電源分布和各種電路)



圖4.EM260 SPI/UART 128kB開發(fā)板電路圖(主微控制器)



圖5.EM260 SPI/UART 128kB開發(fā)板電路圖(信號(hào)流程圖)



圖6.EM260 SPI/UART 128kB開發(fā)板電路圖(SPI/UART和USB/DEI 邏輯)



圖7.EM260 SPI/UART 128kB開發(fā)板電路圖(USB, DEI, 和TTL 外接口)

詳情請(qǐng)見:
http://www.ember.com/pdf/120-0260-000_EM260_Datasheet.pdf
和
http://www.ember.com/pdf/120-2008-000_EM260_SPI_UART_128K_BreakoutBoard.pdf