International standard | IEEE 802.15.4 |
---|---|
Developed by | Microchip Technology |
Industry | Wireless mesh, IoT |
Compatible hardware | SAMR30, SAMR21, MRF89XA, MRF24J40 |
Physical range | 20–100 meters |
MiWi is a proprietary wireless protocol supporting peer-to-peer, star network connectivity. It was designed by Microchip Technology. MiWi uses small, low-power digital radios based on the IEEE 802.15.4 standard, and is designed for low-power, cost-constrained networks, such as industrial monitoring and control, home and building automation, remote control, wireless sensors, lighting control, and automated meter reading. [1]
The MiWi protocol is supported on Microchip's SAMR30 (sub-gigahertz) [2] and SAMR21 (2.4 GHz) [3] ARM Cortex-M0+ devices and modules. Legacy MiWi protocol code supporting PIC and dsPIC microcontrollers has been frozen and is no longer recommended for new designs; however, it is still available in the Microchip Library for Applications (MLA) [4] for the MPLAB Integrated Development Environment. [5]
Microchip Technology released technical information on MiWi. [6] [7] These are not primarily protocol specifications and are focused on implementing the MiWi protocol on Microchip microcontrollers.
As of 2019, interoperable third party implementations have not appeared. Unless they do, it will not be clear if those specifications are complete or accurate enough to serve roles other than supporting Microchip's code or being one more proprietary example of a lightweight WPAN stack. Many developers trying to use WPAN technologies have observed that the competing Zigbee WPAN protocol seems undesirably complex. Accordingly, there exists a technical niche for simpler protocols, of which MiWi is a proprietary example.
The MiWi protocol is a small foot-print alternative (3K-32K[ vague ]) to Zigbee (40K-180K), for cost-sensitive applications with limited memory. The MiWi protocol stack supports star network and peer-to-peer wireless-network topologies, useful for simple, short-range, wireless node-to-node communication. Additionally, the stack provides sleeping-node, active-scan and energy-detect features while supporting the low-power requirements of battery-operated devices.
Microchip Technology released MiWi support on the SAMR30 [2] and SAMR21 [3] RF-MCU's in 2018. Both devices are ARM Cortex M0+, and have 256 KB Flash and up to 40 KB RAM and utilize OQPSK RF Modulation defined in IEEE 802.15.4 for a +3dB advantage in power efficiency vs. FSK modulation. [8] Legacy devices supporting MiWi include several PIC Microcontrollers paired with the MRF89XA [9] (Proprietary Sub-GHz Transceiver) or the MRF24J40 [10] (an IEEE 802.15.4 2.4 GHz transceiver).
MiWi Modules
In 2018 Microchip released the SAMR30M, [11] a module based on the SAMR30 Cortex M0+ sub-GHz RF-MCU.
In 2008, Microchip released a 2.4 GHz wireless transceiver module with a standard 4-wire SPI interface paired with several Microchip PIC and dsPIC microcontrollers (the Microchip MRF24J40MA, MRF24J40MD, MRF24J40ME), and can be used in production devices. Being ZigBee compliant, and capable of communicating using MiWi wireless protocols, it is based on the IEEE 802.15.4 Wireless PAN standard. Option are for PCB antenna or u.FL connected antenna. The modules are regulatory-agency certified for the USA (Federal Communications Commission (FCC) Part 15, Subpart C), Canada (Industry Canada) and European - Radio Equipment Directive (RED) 2014/53/EU, eliminating the need for users to receive independent FCC certification for their wireless products. [12]
Microchip Technology's ZENA (Zigbee Enhanced Network Analyzer) is a wireless packet sniffer and network analyzer following the IEEE 802.15.4 specification on the 2.4 GHz band. The ZENA analyzer supports both the ZigBee and MiWi protocols. Accompanying software can analyze network traffic and graphically display decoded packets. It can also display the network topology and the messages as they flow through the network. With the provided key of the network, data on encrypted MiWi networks can be sniffed and viewed as well.
IEEE 802.15 is a working group of the Institute of Electrical and Electronics Engineers (IEEE) IEEE 802 standards committee which specifies Wireless Specialty Networks (WSN) standards. The working group was formerly known as Working Group for Wireless Personal Area Networks.
A personal area network (PAN) is a computer network for interconnecting electronic devices within an individual person's workspace. A PAN provides data transmission among devices such as computers, smartphones, tablets and personal digital assistants. PANs can be used for communication among the personal devices themselves, or for connecting to a higher level network and the Internet where one master device takes up the role as gateway.
A wireless network is a computer network that uses wireless data connections between network nodes. Wireless networking allows homes, telecommunications networks and business installations to avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Admin telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.
Wi-Fi is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves. These are the most widely used computer networks, used globally in home and small office networks to link devices and to provide Internet access with wireless routers and wireless access points in public places such as coffee shops, hotels, libraries, and airports to provide visitors.
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IEEE 802.15.4 is a technical standard which defines the operation of a low-rate wireless personal area network (LR-WPAN). It specifies the physical layer and media access control for LR-WPANs, and is maintained by the IEEE 802.15 working group, which defined the standard in 2003. It is the basis for the Zigbee, ISA100.11a, WirelessHART, MiWi, 6LoWPAN, Thread, Matter and SNAP specifications, each of which further extends the standard by developing the upper layers which are not defined in IEEE 802.15.4. In particular, 6LoWPAN defines a binding for the IPv6 version of the Internet Protocol (IP) over WPANs, and is itself used by upper layers like Thread.
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Microchip Technology Incorporated is a publicly listed American corporation that manufactures microcontroller, mixed-signal, analog, and Flash-IP integrated circuits. Its products include microcontrollers, Serial EEPROM devices, Serial SRAM devices, embedded security devices, radio frequency (RF) devices, thermal, power and battery management analog devices, as well as linear, interface and wireless products.
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MPLAB is a proprietary freeware integrated development environment for the development of embedded applications on PIC and dsPIC microcontrollers, and is developed by Microchip Technology.
IEEE 802.15.4a was an amendment to IEEE 802.15.4-2006 specifying that additional physical layers (PHYs) be added to the original standard. It has been merged into and is superseded by IEEE 802.15.4-2011.
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Silicon Laboratories, Inc. is a fabless global technology company that designs and manufactures semiconductors, other silicon devices and software, which it sells to electronics design engineers and manufacturers in Internet of Things (IoT) infrastructure worldwide.
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Banana Pi is a line of single-board computers produced by the Chinese company Shenzhen SINOVOIP Company, its spin-off Guangdong BiPai Technology Company, and supported by Hon Hai Technology (Foxconn). Its hardware design was influenced by the Raspberry Pi, and both lines use the same 40-pin I/O connector.
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