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Embedded transceivers target 868-, 915-, 950MHz networks

Posted: 16 Jun 2010     Print Version  Bookmark and Share

Keywords:Wi-Fi  transceiver  Ethernet  embedded  network 

Microchip Technology debuts an embedded Wi-Fi transceiver module and an ultra low-power transceiver module for 868-, 915- and 950MHz networks. The Wi-Fi module is the first announcement in that area since the company bought low-power Wi-Fi start-up ZeroG back in January and is essentially a suite of enhancements to already available modules, primarily focused on ease of use and a new TCP/IP stack, version 5.25.

According to Tyler Smith, marketing manager for Microchip's RF products division, the enhancements take further the work Microchip was doing with ZeroG before the acquisition in that there is now a more optimised matching between Microchip's PIC controllers and the RF transceiver, brought about through enhancements to the flash firmware and the API. That API has been improved for ease of use and more features for advanced customers. The Connection Manager has also been moved into the module.

The announcement also coincides with the release of a new TCP/IP stack, version 5.25, which adds connection utilities and provides for seamless migration between Ethernet and Wi-Fi networks.

According to Smith, a key feature of that stack is the EZConfig utility which allows embedded systems to easily associate with any Wi-Fi network by serving up a configuration page to any Wi-Fi-enabled device. Once the SSID and security information has been entered, the device reboots and associates with the desired network. A free ZeroConfig utility, an IETF standard protocol also known as Apple's Bonjour and Avahi for Linux, is also provided with the stack.

The Wi-Fi module comes in two flavours: the MRF24WB0MA has an integrated PCB antenna while the MRF24WB0MB has an external antenna connection. They comprise the transceiver, power amplifier, RAM, ROM, SPI interface and encryption accelerator, as well as the flash memory, matching circuitry and the antennae.

Fig.1: Block diagram of Microchip embedded Wi-Fi module though key enhancements have more to do with firmware and the TCP/IP stack than with the hardware.

Microchip performed tests using various external antenna configurations. Those results are shown below.

External antenna configuration test results (Click on image to enlarge.)

Sub-GHz modules
At ESC the company also announced the MRF89XA transceiver and transceiver modules for operation in the 868-, 914- and 950MHz bands in applications such as remote metering, home and industrial automation, tyre-pressure monitoring, toys and human-interface devices.

The devices uses FSK/OOK modulation, have a receive current of 3mA, a transmit current of 25mA at +10dBm and a receive sensitivity of -107dBm with FSK and -113dBm with OOK modulation. The standby current is 0.3µA and the devices come in a 5mm x 5mm 32-TQFN package.

The modules come with an integrated PCB antenna, matching circuit components, FCC/IC/ETSI compliance and support Microchip's MiWi and MiWi P2P stacks.

The Wi-Fi modules are available for Rs.1,357.60 ($29.40) each. The TCP/IP stack is free. MRF24WB0MA PICtail and PICtail Plus development boards are also available now for Rs.2,770.16 ($59.99).

The MRF89XA transceiver is available now and costs Rs.81.27 ($1.76) each per 5,000, while the module will be available in Q3 and will cost Rs.392.50 ($8.50) each.

The MRF89XAM8A and MRF89XAM9A PICtail/PICtail Plus daughter boards are also expected to be available in Q3.

- Patrick Mannion
RF Designline





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