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| Silabs EM35x高性能ZigBee系统级芯片解决方案 |
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| 文章来源： 更新时间：2014/9/23 15:59:00 |
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Silabs公司的EM35x系列是高性能ZigBee/802.15.4系统级芯片(SoC),基于ARM® Cortex®-M3内核,集成了2.4 GHz IEEE 802.15.4无线收发器和32位微处理器,闪存和RAM以及支持网络级调试的功能强大硬件.主要用在智能能源,家庭自动化,工业自动化,建筑物自动化,照明控制以及安全监视和自动化(SMA).本文介绍了EM351/EM357主要特性,框图, 典型应用电路及其材料清单(BOM), Ember EM35xx 开发板(RF6525)主要特性,电路图和材料清单以及PCB元件布局图.
The EM35x and EM358x Ember® ZigBee® chips are the industry’s leading ARM® Cortex®-M3 based family of ZigBee SoCs delivering unmatched performance, power consumption and code density in a compact package. The EM35x and EM358x families combine a 2.4 GHz IEEE 802.15.4 radio transceiver with a 32-bit microprocessor, Flash memory and RAM with powerful hardware supported network-level debugging features. Combined with the powerful ecosystem of ARM tools, these devices and tools enable OEMs to simplify development and accelerate time to market.
The EM35x and EM358x SoCs are tightly integrated with EmberZNet PRO, a ZigBee compliant mesh networking software which is the most deployed ZigBee platform in the market.
The EM351 and EM357 are fully integrated system-on-chips that integrate a 2.4 GHz, IEEE 802.15.4-2003-compliant transceiver, 32-bit ARM® Cortex-M3 microprocessor, flash and RAM memory, and peripherals of use to designers of ZigBee-based systems.
The transceiver uses an efficient architecture that exceeds the dynamic range requirements imposed by the IEEE 802.15.4-2003 standard by over 15 dB. The integrated receive channel filtering allows for robust co-existence with other communication standards in the 2.4 GHz spectrum, such as IEEE 802.11-2007 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.
The integrated 32-bit ARM® Cortex-M3 microprocessor is highly optimized for high performance, low power consumption, and efficient memory utilization. Including an integrated MPU, it supports two different modes of operation—privileged mode and user mode. This architecture could allow for separation of the networking stack from the application code, and prevents unwanted modification of restricted areas of memory and registers resulting in increased stability and reliability of deployed solutions.
The EM351 has 128 kB of embedded flash memory and the EM357 has 192 kB of embedded flash memory. Both chips have 12 kB of integrated RAM for data and program storage. The Ember software for the EM35x employs an effective wear-leveling algorithm that optimizes the lifetime of the embedded flash.
To maintain the strict timing requirements imposed by the ZigBee and IEEE 802.15.4-2003 standards, the EM35x integrates a number of MAC functions, AES128 encryption accelerator, and automatic CRC handling 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. The Ember Packet Trace Interface is also integrated with the MAC, allowing complete, non-intrusive capture of all packets to and from the EM35x with Ember development tools.
The EM35x offers a number of advanced power management features that enable long battery life. A high-frequency internal RC oscillator allows the processor core to begin code execution quickly upon waking. Various deep sleep modes are available with less than 1 μA power consumption while retaining RAM contents. To support user-defined applications, on-chip peripherals include UART, SPI, TWI, ADC, and general-purpose timers, as well as up to 24 GPIOs. Additionally, an integrated voltage regulator, power-on-reset circuit, and sleep timer are available.
Finally, the EM35x utilizes standard Serial Wire and JTAG interfaces for powerful software debugging and programming of the ARM Cortex-M3 core. The EM35x integrates the standard ARM system debug components: Flash Patch and Breakpoint (FPB), Data Watchpoint and Trace (DWT), and Instrumentation Trace Macrocell (ITM).
EM358x/EM35x chips can be designed in as full system-on-chip (SoC) devices for low cost, low power sensors and other devices in the home, or as network co-processor (NCP) devices for more complex applications running on a large applications microprocessor.
EM351/EM357主要特性:
-32-bit ARM® Cortex -M3 processor
-2.4 GHz IEEE 802.15.4-2003 transceiver & lower MAC
-128 or 192 kB flash, with optional read protection
-12 kB RAM memory
-AES128 encryption accelerator
-Flexible ADC, UART/SPI/TWI serial communications, and general purpose timers
-24 highly configurable GPIOs with Schmitt trigger inputs
Industry-leading ARM® Cortex -M3 processor
-Leading 32-bit processing performance
-Highly efficient Thumb-2 instruction set
-Operation at 6, 12, or 24 MHz
-Flexible Nested Vectored Interrupt Controller
Low power consumption, advanced management
-RX Current (w/ CPU): 26 mA
-TX Current (w/ CPU, +3 dBm TX): 31 mA
-Low deep sleep current, with retained RAM and GPIO: 400 nA without/800 nA with sleep timer
-Low-frequency internal RC oscillator for low-power sleep timing
-High-frequency internal RC oscillator for fast (110 μs) processor start-up from sleep
Exceptional RF Performance
-Normal mode link budget up to 103 dB; configurable up to 110 dB
-–100 dBm normal RX sensitivity; configurable to –102 dBm (1% PER, 20 byte packet)
-+3 dB normal mode output power; configurable up to +8 dBm
-Robust Wi-Fi and Bluetooth coexistence
Innovative network and processor debug
-Packet Trace Port for non-intrusive packet trace with Ember development tools
-Serial Wire/JTAG interface
-Standard ARM debug capabilities: Flash Patch & Breakpoint; Data Watchpoint & Trace; Instrumentation Trace Macrocell
Application Flexibility
-Single voltage operation: 2.1–3.6 V with internal 1.8 and 1.25 V regulators
-Optional 32.768 kHz crystal for higher timer accuracy
-Low external component count with single 24 MHz crystal
-Support for external power amplifier
-Small 7x7 mm 48-pin QFN package
EM351/EM357应用:
Smart Energy
Home Automation
Security Monitoring and Automation (SMA)
Lighting Controls
Building Automation
Industrial Automation
图1. EM351/EM357框图
图2. EM351/EM357典型应用电路
图2典型应用电路的材料清单(BOM):
Ember EM35xx 开发板
The EM35xx Series Development Kit development board set has three major hardware components:
• EM35xx Breakout Board
• EM35xx Module
• Debug Adapter (ISA3)
The EM35xx Series Development Kit also includes the following components:
• US-to-Multinational AC Plug Power Adapter Kit
• Power-Over-Ethernet (PoE) Switch
• USB Power Adapters
• Miscellaneous Cables (USB, DEI, Packet Trace Port, and RF Coax)
图3.EM35xx分接板外形图
分接板包括以下元件:
• External power supply connectors
• One DB-9 serial port connector for RS-232 serial communication
• One USB connector for EM35xx SC1 virtual COM port serial communication
• One USB connector for EM358x USB virtual COM port serial communication
• One header with TTL-compliant UART signals for EM35xx SC1 SPI serial communication
• A buzzer, two buttons, two LEDs, and a temperature sensor for application development purposes
• External serial flash for application bootloader purposes (via either EM35xx SC1 or SC2)
• Hardware reset buttons for the EM35xx module
• Prototype or bread-boarding area (28 x 20, 0.1” pitch array) for application-specific hardware development
• One data emulation interface connector
图4. Ember EM35xx 开发板(RF6525)电路图(1)
图5. Ember EM35xx 开发板(RF6525)电路图(2)
图6. Ember EM35xx 开发板(RF6525)电路图(3)
图7. Ember EM35xx 开发板(RF6525)电路图(4)
Ember EM35xx 开发板(RF6525)材料清单(BOM):
图8. Ember EM35xx 开发板(RF6525)PCB元件布局图
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