Austriamicrosystems AS3930单路低功耗ASK接收方案

Austriamicrosystems公司的 AS3930是单路低功耗ASK接收器,能产生LF载波频率在110-150kHz间的叫醒信号.集成的相关器能用来检测可编程的16位叫醒图,叫醒支持1秒到2小时, 叫醒灵敏度100μVRMS,工作电压2.4-3.6V,主要用在RF标签,实时定位系统,工作人员识别,接入控制和无线传感器.本文介绍AS3930主要特性, 方框图,有晶振,无晶振和外接时钟源的AS3930应用电路.

Active RFID tags, real-time location systems, operator identification, access control, and wireless sensors

AS3930 Single Channel Low Frequency Wakeup Receiver

The AS3930 is a single-channel low power ASK receiver that is able to generate a wakeup upon detection of a data signal which uses a LF carrier frequency between 110 - 150 kHz. The integrated correlator can be used for detection of a programmable 16-bit wakeup pattern.

The AS3930 provides a digital RSSI value, it supports a programmable data rate and Manchester decoding with clock recovery. The AS3930 offers a real-time clock (RTC), which is either derived from a crystal oscillator or the internal RC oscillator.

The programmable features of AS3930 enable to optimize its settings for achieving a longer distance while retaining a reliable wakeup generation. The sensitivity level of AS3930 can be adjusted in presence of a strong field or in noisy environments.

The device is available in 16 pin TSSOP and QFN 4x4 16 LD packages.

AS3930主要特性:

Single channel ASK wakeup receiver

Carrier frequency range 110-150 kHz

Programmable wakeup pattern (16bits)

Doubling of wakeup pattern supported

Wakeup without pattern detection supported

Wakeup sensitivity 100μVRMS (typ.)

Adjustable sensitivity level

Highly resistant to false wakeups

False wakeup counter

Periodical forced

wakeup supported (1s–2h)

Low power listening modes

Current consumption in listening mode 1.37 μA (typ.)

Data rate adjustable from 0.5 - 4 kbps (Manchester)

Manchester decoding with clock recovery

Digital RSSI

Dynamic range 64dB 5 bit

RSSI step (2dB per step)

RTC based on 32kHz XTAL, RC-OSC, or external clock

Operating temperature range -40 to +85℃

Operating supply voltage 2.4 - 3.6V (TA = 25℃)

Bidirectional serial digital interface (SDI)

Package option 16 pin TSSOP, QFN 4x4 16 LD

AS3930应用:

The AS3930 is ideal for Active RFID tags, real-time location systems, operator identification, access control, and wireless sensors.

图1.AS3930方框图


图2.有晶振的AS3930应用电路

图3.无晶振的AS3930应用电路

图4.外接时钟源的AS3930应用电路