Freescale TWR－RF－SNAP无线网状网络解决方案

2012年04月11日 15:00 发布者：1770309616

Freescale公司的TWR-RF-SNAP无线网状网络解决方案是采用Synapse公司基于Freescale的MC13224V收发器平台的SM700 RF引擎.这种无线网络模块采用带大容量片上存储器的ARM7 32位处理器,并集成了12位ADC,工作频率2400 - 2483.5MHz,输出功率高达100mW,16个RF通路,户外LOS距离达1.5英里,而TWR-RF-SNAP无线网状网络模块可单独使用,也可和Tower System一起使用.本文介绍了Synapse公司的SM700 RF引擎主要特性和指标,方框图以及RF无线网状网络模块TWR-RF-SNAP主要特性,方框图和电路图.

Synapse raises the bar on integrated performance with its SM700 RF Engine® based on the Freescale™ MC13224V transceiver platform. This wireless network module uses an ARM7 32-bit processor with large on-chip memory and integrated 12-bit ADCs.

And like all RF Engines from Synapse, the Model SM700 comes with SNAP® already loaded and ready to perform right out of the box. SNAP is Synapse’s award-winning, mesh network operating system that provides wireless connectivity for Internet-to-machine and machine-to-machine communications.

With 96K RAM of memory, large applications can bring intelligence to the very edge of the network for local operations. These applications can be uploaded over-the-air… even mesh hopping across the network to reach its destination. And because of the large memory in the SM700, the core SNAP operating system can also be upgraded over-the-air and leaves your network in place and intact.

Very little board space is needed for this RF Engine (25mm x 36mm). Even the antenna is integrated to further reduce system size and cost. What comes in a small package however is big on capabilities. The SM700 can achieve a range of over 1.5 miles and deliver an output of up to +20dBm. For applications requiring battery power, the Model SM700 can perform at power consumption levels as low as 12 μA.

SM700 RF引擎主要特性:

Powerful 32-bit TDMI ARM7 microprocessor

2.4 GHz RF Frequency (2400 - 2483.5MHz)

Up to 100mW output power

16 RF Channels

Small footprint: 1” x 1.4” (25.4mm x 36.5mm)

Integrated F-antenna

Over 1.5 miles range

AES 128-bit encryption

FCC, CE and IC certified Accurate 12-bit ADC for precision sensors

Large on-board memory resources

-96 dBm Rx sensitivity

+20dBm Tx output power

2.0 to 3.6 Volts Vcc

Low power consumption:

Transmit mode……193 mA

Receive mode………30 mA

Hibernate mode……1.1 µA

Operating temperature: -40℃ to +85℃

Small surface-mount IC footprint

SM700 RF引擎指标:

图1. SM700 RF引擎方框图

RF无线网状网络模块TWR-RF-SNAP

The Wireless Mesh Networking Tower Board (TWR-RF-SNAP) is a peripheral Tower System Module. The TWR-RF-SNAP provides wireless mesh networking via the FCC Certified Synapse Wireless SM700 RF Engine. The SM700 is based on the Freescale MC13224 chip which combines a 32-bit ARM7 MCU with an IEEE 802.15.4 radio transceiver.

The TWR-RF-SNAP module can function standalone or within the Tower System. As part of the Tower System, the TWR-RF-SNAP can interface with Tower System controller modules via SPI and can access available Tower System peripheral modules using UART or I2C. The TWR-RF-SNAP also includes a General Purpose Tower Plug-in (TWRPI) socket allowing direct access to a selection of sensor plug-ins via I2C.

A SN132 USB Dongle is also included with the TWR-RF-SNAP. The USB Dongle features the RF100 RF Engine based on a Freescale MC9S08 MCU and the Freescale MC13191 radio. The USB dongle provides a communication portal to a host computer via USB.

The TWR-RF-SNAP can be accessed in Synapse’s Portal IDE using either the on-board USB or wirelessly using the included RF100 USB Dongle.

RF无线网状网络模块TWR-RF-SNAP主要特性:

Features the SM700 802.15.4 RF Engine from Synapse Wireless, based on the Freescale MC13224 module

Pre-loaded with SNAP Network Operating System

Push button inputs and user controlled LEDs

On-board low-power linear active thermistor and light sensor

On-board TWRPI connector for the addition of standard Freescale TWRPI modules

Configurable access to Tower Elevator connector allows for interaction with other Tower modules (UART, SPI and I2C)

MicroUSB connector provides power and serial connectivity

Multiple powering options

Access to additional GPIOs on SM700 via header bloc