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AS3931-TPD Datasheet(PDF) 2 Page - ams AG |
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AS3931-TPD Datasheet(HTML) 2 Page - ams AG |
2 / 31 page AS3931 3D Low Power Wakeup Receiver www.austriamicrosystems.com/AS3931 Revision 6.2 1 - 30 Datasheet 1 General Description The AS3931 is an ultra low power, three channel LF ASK receiver designed to operate in various applications such as LF identifications systems and LF tag receivers. AS3931 detects a low frequency ASK-modulated signal by looking for a digital wakeup pattern and generates a WAKE signal after successful pattern detection. The device incorporates an intelligent pattern detection algorithm that provides reliable operation in presence of strong interference. An RSSI signal can be generated at the RSSI pin for each receiver channel. The product is available in 16-pin TSSOP package. The AS3931 contains: Antenna rotation switch Three independent LF receiver chains Wakeup output combining the three receiver chains Low power 32.768kHz crystal oscillator circuit Serial programming interface Voltage regulator with 2.4V output, on/off switchable Each independent LF receiver chain contains: Input overload protection Input attenuator Ultra low power LF amplifier with logarithmic envelope output Robust data detector with adaptive slicing threshold that translates the logarithmic envelope into a digital data signal. Error tolerant digital pattern correlator that detects a given code sequences in the received data signal and generates a wakeup signal. Sophisticated power management logic that powers down the correlator if no data is received. 2 Key Features Programmable Serial Data Interface Flexible carrier frequencies Three axis wakeup pattern detection Three axis LF field strength measurement Antenna rotation for easy calibration High sensitivity and high dynamic range Wide operating frequency range Reliable, interference resistant wakeup decoding Highly protected differential inputs Ultra low power consumption Automotive qualified 16-pin TSSOP package 3 Applications The device is ideal for LF identification systems, LF tag receivers, three dimensional LF field strength measurement systems, and Ultra low power wake up systems. Transmitting Antenna VCC CBAT RP CREG RSSI DATA CLOCK CHIP SEL WAKE CB XTAL CA VCC LF1N LF1P LF2N LF2P LF3N LF3P GND XIN XOUT WAKE CS SCL SDA RSSI VREG Figure 1. Typical Application Diagram |
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