AS3993-DK FERMI

Manufacturer Part NumberAS3993-DK FERMI
DescriptionRFID Transponder Tools AS3993 Demo Board Fermi
Manufacturerams
AS3993-DK FERMI datasheet
 

Specifications of AS3993-DK FERMI

RohsyesProductRFID Readers
Description/functionDemonstration ReaderFrequency20 MHz
Interface TypeSPI, USBMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 COperating Supply Voltage5 V
Tool Is For Evaluation OfAS3993For Use WithAS3993 UHF RFID Reader IC
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Application Note: UHF RFID Fermi Reader
HW-Description
AS3993
UHF RFID Single Chip Reader EPC
Class1 Gen2 Compatible
www.ams.com
Revision 1.0 / 2012/06/26

AS3993-DK FERMI Summary of contents

  • Page 1

    ... Application Note: UHF RFID Fermi Reader HW-Description AS3993 UHF RFID Single Chip Reader EPC Class1 Gen2 Compatible www.ams.com Revision 1.0 / 2012/06/26 ...

  • Page 2

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Table of Contents 1. Introduction .......................................................................................................................... 2 2. Key Features ....................................................................................................................... 3 3. Applications ......................................................................................................................... 4 4. Reader System Description .................................................................................................. 5 5 Interfaces ............................................................................................................................. 7 5.1 USB .......................................................................................................................... 7 5.2 UART Interface ......................................................................................................... 7 5.3 Pin Header Interface Description .............................................................................. 8 5.4 Programming Interface Description........................................................................... 9 6 Reader Part ....................................................................................................................... 10 6.1 RF Tracks – Impedance Calculation ....................................................................... 10 6.2 Reader Part – ...

  • Page 3

    ... The reader portion is designed such that it can be easily connected to a host MCU via SPI. The high level of integration found on the AS3993 UHF RFID Reader IC allows for minimal code loading and quick implementation. The designs come with free, fully portable code and all Gerber data and schematics. This allows for a quick, trouble free design in ...

  • Page 4

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 2. Key Features • Interface Between the Controller and Host Computer: USB (optional UART) o Between the Controller and the AS3993 is SPI via a low cost pin header o connection Between the RF board and the Antenna we use a U.FL (50 Ohm) SMA (Male) o • ...

  • Page 5

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 3. Applications Typical applications for the FERMI demo reader include: • Embedded Consumer Applications • Mobile Applications (Low Power Handheld, PDA’s, Smart Phones) • Embedded Industrial Applications • Gaming • Desk top readers • ...

  • Page 6

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 4. Reader System Description 6 1. AS3993 UHF RFID reader IC (ams) 2. Balun 2:1 (Johanson Technology) 3. Power Amplifier RF2172 (RFMD) 4. Directional coupler / Low pass filter combination (Johanson Technology) 5. U.FL antenna port (Hirose) 6. Loop Filter 7. OAD pins for debugging purposes 8 ...

  • Page 7

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI MCU C8051F340 (Silabs) 2. USB connector 3. Interface connectors to reader PCB 4. UART connector 5. C2 programming interface for boot loader 6. Indicator LED 7. X-tal (for extended USB functionality) 8. LDO (5 V → 3.5 V) www.ams.com Figure 2 - Controller Part Revision 2 ...

  • Page 8

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 5 Interfaces 5.1 USB The USB is used to communicate to the host computer and to supply the reader system. The 5V USB voltage is regulated down to 3.5 V. 5.2 UART Interface www.ams.com Revision 2.0 / 6/22/12 page 7/17 ...

  • Page 9

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) In order to establish a connection to the host computer via UART it is recommend to use an USB TTL serial cable with 3.3 Volt (FTDI TTL-232R-3V3-WE). 5.3 Pin Header Interface Description Figure 3 - Pin Header Position (all dimensions in mm) www.ams.com CLSYS ...

  • Page 10

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 5.4 Programming Interface Description Figure 4 - Programming Interface (all dimensions in mm) www.ams.com Revision 2.0 / 6/22/12 page 9/17 ...

  • Page 11

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 6 Reader Part The reader part contains all RF and UHF RFID relevant components. In order to keep PCB costs low the reader part is 2-layer PCB only while all components are located on the top layer. The component placement was chosen to reach a small form factor PCB. 6.1 RF Tracks – ...

  • Page 12

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 6.3 Reader Part – Schematics Reader Section: Loop Filter: The loop filter used for the PLL is partly inside the reader IC. The external part is shown above. The loop filter values are provided by ams. Other values are possible and are mentioned in a separate application note ...

  • Page 13

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Indicator LEDs: The three indicator LEDs on the reader part together with the LED on the controller part are used to display error states at the start-up of the reader system. LSB (bit 0) is the controller LED and reader LEDs D1 – ...

  • Page 14

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Balun Section: The output impedance of the 0 dBm (low power) outputs are 100 ohm differential. Therefore a 2:1 Balun is used to convert the RF track impedance to 50 ohm single ended. In case the ouput power should be very low the resistor R8, R9 and R10 (Pi-Pad) can be used to attenuate the RF signal ...

  • Page 15

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) PA Section: The PA is supplied by the reader ICs internal voltage regulators. Since the reader ICs internal PA is not used the corresponding voltage regulator (VDD_PA) is used for the external PA supply. The power down pin of the external PA is supplied by the VDD_B regulator which is also supplies the 0 dBm output driver of the reader IC ...

  • Page 16

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Directional Coupler and RX Balun Section: The directional coupler also includes a low pass filter which attenuates the higher order harmonics of the carrier signal. The directional coupler is needed in order to prevent the TX signal leaking into the receiver. The used coupler is a trade-off between cost and directivity. The antenna connector ...

  • Page 17

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 6.4 OAD Pins The pads J1 and J2 are connected to the OAD pins of the reader IC which can be used to output analog/digital RX subcarrier signals based band signals. 7 Controller Part The controller part contains the low cost MCU and the LDO used for reducing the USB voltage down to 3.5 Volts. All the interfaces (USB, UART, … ...

  • Page 18

    ... AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Copyright Copyright © 1997-2012, ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. ...