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ams AG

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Tobelbaderstrasse 30

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Summary of Contents for AS3932

Page 1: ...cal content of this austriamicrosystems application note is still valid Contact information Headquarters ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten Austria Tel 43 0 3136 500 0 e Mail ams_sales ams com Please visit our website at www ams com ...

Page 2: ...Receiver AS3932 APPLICATION NOTE Application Note AS3932 Migration from ATA5283 1 channel to AS3932 Date 09 02 2009 Revision 1 0 Copyright 2009 austriamicrosystems a m s A G T e c h n i c a l c o n t e n t s t i l l v a l i d ...

Page 3: ...ARDWARE 3 2 1 APPLICATION DIAGRAMS 3 2 2 OSCILLATOR FREQUENCY 4 2 3 SERIAL DIGITAL INTERFACE 5 2 4 WAKEUP AND DATA PIN 5 2 5 MANCHESTER CLOCK RECOVERY 5 3 PROTOCOL COMPATIBILITY 5 Copyright 2009 austriamicrosystems Version 1 0 Date 20 02 2009 Page 2 of 7 a m s A G T e c h n i c a l c o n t e n t s t i l l v a l i d ...

Page 4: ...nnels available Therefore it is mandatory to connect the channels 2 and 3 LF2P and LF3P of AS3932 to a fixed DC potential either GND or VCC and to disable them in the register map via SDI see chapter 3 The ATA5283 application block diagram shows that the input antenna has to be referenced to the positive supply while the AS3932 block diagram shows that the inputs are referenced to ground In additi...

Page 5: ...o define the oscillator frequency using the internal RC oscillator This oscillator can be calibrated with the microcontroller see p 27 of AS3932 data sheet in order to increase its precision In this case the XIN and XOUT have to be connected to the positive supply voltage as shown in figure 2 4 VCC LF1P LF2P LF3P LFN VSS GND XIN XOUT WAKE DAT CL_DAT CS SCL SDI SDO CBAT X Y AND Z RECEIVING ANTENNAS...

Page 6: ...S3932 has a fully integrated Manchester clock recovery which provides the recovered clock on the pin CL_DAT This pin is missing in the ATA5283 thus no clock recovery is possible In case clock recovery is not required the pin CL_DAT of AS3932 can remain floating 3 Protocol compatibility The ATA5283 wakes up if a carrier burst of at least 704 periods is followed by a start gap no Signal an example i...

Page 7: ...ect command Write in the register R0 7 0 02 HEX This ensures that Channel 2 and Channel 3 are disabled in order to reduce the current consumption Write R1 7 0 21 HEX in case the crystal oscillator is used or write R1 7 0 20 HEX if the RC oscillator is used In this way the wakeup will occur only based on frequency detection Set the envelop detector time constant R3 2 0 according to the used bit rat...

Page 8: ...ed adapted merged translated stored or used without the prior written consent of the copyright owner To the best of its knowledge austriamicrosystems asserts that the information contained in this publication is accurate and correct austriamicrosystems reserves the right to discontinue production and change specifications and prices make corrections modifications enhancements improvements and othe...

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