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Summary of Contents for AMS AS3992
- Page 1 Application Note DN[Document ID] AS3992 Arnie – Hardware Description ams Application Note, Confidential Page 1 [v1-02] 2014-Jul-24 Document Feedback...
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Page 2: Table Of Contents
PCP Specification ......................17 Layer Stack ........................17 Impedance Controlled Traces .................... 18 Test Points ......................... 20 Contact Information ......................21 Copyrights & Disclaimer ..................... 22 Revision Information ......................23 ams Application Note, Confidential Page 2 [v1-02] 2014-Jul-24 Document Feedback... -
Page 3: Introduction
The default operating voltage of the Arnie demo reader is 6 Volt. Since most of the Gen2 related processing is done on the AS3992 device the computational load is kept at a minimum. The used MCU is a widely used 8051 controller using USB for host communication. -
Page 4: Block Diagram
AS3992 device is shown in Error! Figure 2: AS3992 Location Reference source not found. The supply voltage of the AS3992 device is 5.3 V which is down-regulated from the external 6 volt power supply via the LDO device AS1364. ams Application Note, Confidential... - Page 5 On the Arnie demo reader the AS3992 device is configured to communicate with the MCU via the SPI interface which complies with SPI mode 1. Beside the available parallel interface the SPI interface is selected by setting pin IO0 to “low” and pin IO1 to “high” before AS3992 is enabled (rising edge on pin EN).
- Page 6 The connection plan of the interface cable is shown in Error! Reference source not found. below: Figure 5: USB Debug Adapter - Interface Cable The interface cable should be connected to the demo board as shown in Error! Reference source not found. below: ams Application Note, Confidential Page 6 [v1-02] 2014-Jul-24 Document Feedback...
- Page 7 In the Options menu (see Error! Reference source not found.) of the IDE software select Connection Options. Serial Adapter should be set to USB Debug Adapter and the Debug Interface should be set to C2. Press OK. ams Application Note, Confidential Page 7 [v1-02] 2014-Jul-24 Document Feedback...
- Page 8 10 Select the boot loader file programmer.hex. 11 Click on Download. Figure 8: Downloading the boot loader 12 When the download process is finished click on auf Disconnect in the Debug menu. ams Application Note, Confidential Page 8 [v1-02] 2014-Jul-24 Document Feedback...
- Page 9 Balun To transform the 100 ohm differential transmit signal of the AS3992 device to a single-ended signal with 50 ohm a 2:1 LTCC balun is used. On the receiving side a second balun is used to convert from 50 ohm to 100 ohm impedance.
- Page 10 ) = 50 ( ) = 292.42 → 294 ��ℎ�� �� − 1 0.4125 �� �� −1 1.4125 −1 ���� = ( ) = ( ) = 17.61 → 17.8 Ohm �� 1.4125 ams Application Note, Confidential Page 10 [v1-02] 2014-Jul-24 Document Feedback...
- Page 11 ADC input of the AS3992 device. Based on the DC voltage from the power detector the bias voltage for the third amplifier stage of the PA is controlled via the DAC output of AS3992. A lookup table is used to choose the correct bias voltage. Note: Loading a custom lookup table in a CSV format is possible using the GUI.
- Page 12 ) which capacitance value can range from 1.05 pF up to 5.1 pF with a step value of 131 fF. The DTCs can be controlled via a SPI interface. Since the AS3992 also has a SPI interface the whole reader can operate with one microcontroller.
- Page 13 MCU complementary. The location of the RF switch is shown in Error! Reference source not found.. The switch has a typical insertion loss of 0.35 dB. LDO – AS3992 Supply Figure 18: Antenna Switch Location ams Application Note, Confidential Page 13...
- Page 14 Class1 Gen2 Compatible The voltage regulator AS1364 (U1) is used to power the AS3992 device and the OP- Amp. AS1710. The output voltage of the voltage regulator is adjustable and is set to 5.3 V by an external voltage divider. The location of the LDO is shown in Error! Reference source not found..
- Page 15 Error! Reference source not found.. Figure 21: OP Amplifier Location TCXO The TCXO (U4) provides the clock for the AS3992 device. The location of the TCXO is shown in Error! Reference source not found.. The TCXO outputs a clipped sine wave signal with 20 MHz.
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Page 16: Supply Concept
6 mm and the inner contact diameter is 1.95 mm. The antenna connectors are 50 ohm SMA receptacles. Switching between two antennas is intended to switch between horizontal and vertical polarization planes. ams Application Note, Confidential Page 16 [v1-02] 2014-Jul-24... -
Page 17: Pcb
Layer 1: TOP LAYER Layer 2: INTERNAL PLANE 1 Layer 3: MID-LAYER 1 Layer 4: INTERNAL PLANE 2 Layer 5: MID-LAYER 2 Layer 6: BOTTOM LAYER Figure 24: Layer Stack ams Application Note, Confidential Page 17 [v1-02] 2014-Jul-24 Document Feedback... -
Page 18: Impedance Controlled Traces
To minimize reflections and hence losses, the impedance of the single- ended coplanar waveguides are matched to 50 ohms. Since transmitting and receiving at the AS3992 device is done differential a differential coplanar waveguide is required which is match ed to 100 ohms. In section 0 and Error! Reference source not found. - Page 19 AS3992 Class1 Gen2 Compatible Figure 28: Differential Coplanar Waveguide Dimensions ams Application Note, Confidential Page 19 [v1-02] 2014-Jul-24 Document Feedback...
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Page 20: Test Points
3V3_MCU: GND: GND_DIG: Vapc2: ADC_In: Signals Tx/Rx: OAD: OAD2: J11 SPI Signals: MISO: SDAT: SCLK: SEN_TUNE1: J26 SEN_TUNE2: J18 SEN_TUNE3: J27 AS3992 Signals: IRQ: EN_AS3992: MCU Programming Interface: C2CK: C2D: ams Application Note, Confidential Page 20 [v1-02] 2014-Jul-24 Document Feedback... -
Page 21: Contact Information
For further information and requests, e-mail us at: ams_sales@ams.com For sales offices, distributors and representatives, please visit: www.ams.com/contact Headquarters ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com ams Application Note, Confidential Page 21 [v1-02] 2014-Jul-24 Document Feedback... -
Page 22: Copyrights & Disclaimer
No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services. -
Page 23: Revision Information
Revision Information Initial version 1-00 Changes from 1-01 (2012-Jun-22) to current revision 1-02 (2014-Jul-24) Update to latest version of ams design Note: Page numbers for the previous version may differ from page numbers in the current revision. ams Application Note, Confidential...
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