austriamicrosystems introduces AS3900 27 MHz transceiver

  • August 09, 2010
  • austriamicrosystems AG

August 9, 2010 - austriamicrosystems introduced the AS3900 27 MHz FSK low-power transceiver with built-in star network management. Operation in this band avoids the interference found in the popular but cluttered 2.4 GHz band and results in a lower amount of energy being absorbed by the human body (SAR) when compared with the 2.4 GHz band -- a key consideration for transmitters operated close to the human body.The AS3900 features austriamicrosystems’ built-in Link manager which offers a hardwired, royalty-free easy to use protocol for self-management of all network functions. The Link manager simplifies product design and significantly reduces system power compared to alternative approaches requiring protocols that run full-time on an external or internal microcontroller. Current consumption is only 2.5 uA in polling mode, and typically 3.8 and 4.9 mA in receive and transmit modes respectively, and include the power required to manage the network. The performance and capabilities of the AS3900 make it well suited for a number of applications where low-power short-range data exchange is required. Such applications include data transfer among devices close to a human body, such as medical and intelligent sporting goods, industrial automation, and any short range sensor network. While an RF antenna requires size comparable to the wavelength of the operating frequency, the AS3900 operates with a small magnetic loop antenna that resonates at 27 MHz. Besides reducing antenna size, magnetic coupling ensures that the signal travels only a short distance, providing inherently secure communications. The long wavelength at 27 MHz operation allows the AS3900 to provide accurate RSSI (received signal strength indication) signal readings, unlike 2.4 GHz transceivers which suffer from reflection issues that compromise RSSI accuracy.The AS3900 transmits data at up to 212 Kbit/s and integrates a number of key features, including; a 32.768 kHz crystal oscillator, 24 bits of OTP memory on-chip, battery level detection, wakeup receiver functionality, digital received signal strength indication (RSSI), and a bi-directional serial digital interface (SDI) for simple interfacing. The AS3900 is available in a 5x5 mm 28-pin QFN package, operates from a 2.2 Volt power supply (functional down to 2.0 Volt), and has an ambient operating temperature range of -40 to +85°C.Price & AvailabilitySamples are available now. Pricing in 1,000-piece quantities is less than $3.00. Technical SupportA demonstration board for the AS3900 is available. Contact austriamicrosystems for price.

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