Data Sheet
AS3900
27MHz Low Power Star Network Transceiver
Main Characteristics
1 General Description
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Operating temperature range -40ºC to +85ºC
The AS3900 is a low power FSK transceiver ideal for battery-
operated short range devices (SRD) applications in which a limited
amount of data (data rate up to 210 kbit/s) need to be transferred.
The device can be configured as transceiver, transmitter only or
receiver only system and operates in one channel in the worldwide
ISM band at 27 MHz.
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Operating supply voltage 2.2V to 3.6V (Functional down to
2.0V)
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Rx current consumption 3.8 mA (typ.)
Tx current consumption 4.9 mA@0dBm, 7.6 mA @10dBm
Maximum output power 10 dBm (delivered to matching network
and antenna)
The frequency of the external oscillator determines the operating
frequency. Use of 27 MHz is in particular advantageous for
communication in close proximity of the human body due to the low
absorption of the signal by tissue because of the low specific
absorption rate at 27 MHz. The device incorporates a serial digital
interface (SDI), which enables bidirectional communication with
external system components.
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Receiver sensitivity –88 dBm @ 106 kbit/s
Polling mode average current consumption typ. 2.5µA
Power down current consumption max. 700nA
Typ. communication range using small antenna 1.2m@0dBm,
2.5m@10dBm
The integrated real-time-clock, sophisticated wake-up functionality,
and link manager enable current efficient control of all
communication events and eliminate the need for an expensive
microcontroller.
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QFN 28 pin (5x5) package
Additional Features
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Reliable pairing and synchronization of master and clients
Automatic 16 bit CRC computation in burst mode
Auto-acknowledgement and re-transmit
The AS3900 supports data transfer in burst mode (bidirectional,
controlled by link manager), semi-continuous (bidirectional,
controlled by microcontroller) and continuous mode (unidirectional,
controlled by microcontroller) and requires only a small number of
external components.
Programmable timers to assign variable communication cycle
times
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Reliable system start due to internal POR
Programmable microcontroller clock frequency
Separate interrupt request line
2 Key Features
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FSK transceiver
Operating frequency 27.12 MHz (ISM - band)
Integrated real-time-clock (RTC) based on 32.768kHz XTAL
FM deviation selectable (±106 kHz, ±53 kHz)
Data transfer in burst mode and (semi-)continuous mode
Data rate adjustable to 26.5, 53, 106, 212 kbit/s
Low average current consumption in Tx and Rx mode
Output power adjustable to 0, +5, +10 dBm
Integrated OOK based wake-up system
Battery level detector
Digital RSSI value accessible in register
User programmable Identification with OTP memory (24 bits)
3 Applications
The AS3900 is ideal for reliable low-power short-range data
exchange, data transfer among devices in close proximity of human
body (Body Area Networks), simple control networks (home,
industry), and interactive remote controls. A typical application can
be designed in combination with a microcontroller, an antenna and a
few additional passive components.
Link manager for control of star network with up to 8 clients
Bidirectional serial digital interface (SDI)
www.austriamicrosystems.com/RF-Transceivers/AS3900
Revision 1.00c
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