austriamicrosystems recently introduced a 27 MHz FSK (frequency shift keying) transceiver. The AS3900 features built-in star network management protocol and operates in the 27 MHz worldwide ISM (industrial, scientific and medical) band. 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 or specific absorption rate); this is a key consideration for transmitters operated close to the human body such as a BAN (body area network) or MBAN (medical body area network).
The AS3900 features austriamicrosystems’ built-in star network management protocol which offers a hardwired, royalty-free protocol for self-management of all network functions. The protocol simplifies product design and reduces system power compared to alternative approaches requiring protocols that run full-time on an external or internal microcontroller. The low-powered transceiver requires only 2,5 μA in polling mode and typically 3,8 and 4,9 mA in receive and transmit modes respectively – including the power required to manage the star network.
The performance and capabilities of the device 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, body area networks and any short-range sensor network. An integrated wakeup receiver allows low current consumption. The AS3900 operates with a small PCB antenna that resonates at 27 MHz.
The transceiver transmits data at up to 212 Kbps and integrates functions such as power amplifier, clock, 24 bits of one-time programmable memory, battery level detection, power on reset (POR) and system timers. Digital RSSI (received signal strength indication), onboard CRC (cyclic redundancy check) and a bidirectional SDI bus (serial digital interface) allow for easy system integration. The AS3900 is available in a 5 x 5 mm 28-pin QFN package, operates from a 2,2 V power supply and has an ambient operating temperature range of -40°C to +85°C.
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