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AS3993 – AN13 – Received Signal Strength Indicator (RSSI)

www.ams.com

Revision 2.0 / 6/22/12

page 5/17

4. Reader System Overview

Figure 1 - Reader Top

1. AS3993 UHF RFID AS3993 (ams)

2. Balun 2:1 (Johanson Technology)

3. Low pass filter

4. Directional coupler / combination (Johanson Technology)

5. Antenna tuning circuit

6. Loop Filter

7. OAD pins for debugging purposes

8. Antenna Switch

9. Onboard antenna (not populated)

10. Internal PA matching Circuit

11. UART interface

12. Debug interface

Содержание Radon AS3993

Страница 1: ...www ams com Revision 1 0 2012 06 26 Application Note UHF RFID Femto Reader HW Description AS3993 UHF RFID Single Chip Reader EPC Class1 Gen2 Compatible ...

Страница 2: ...I Interface Connections 10 Figure 18 OAD Pads 10 Figure 7 RF Tracks Impedance Calculation dimensions in mil 11 Figure 8 RF Part PCB Stackup 11 Figure 9 Reader System Components 13 Figure 10 Schematic Reader Section 14 Figure 11 Schematic RF Section 14 Figure 12 Schematic Tuning Circuit 15 Figure 13 Schematic Controller Section 15 Figure 14 Schematic Connector Section 16 Figure 15 Schematic Power S...

Страница 3: ...y using the internal PA delivering up to 20 dBm it is ideally suited for cost and form factor constraint applications The Femto demo reader features an antenna tuning circuit to re tune the resonance frequency of the antenna in case a de tuning occurs In addition the Femto reader features an antenna switch to allow UHF RFID operation through an external antenna or the onboard chip antenna1 The Fem...

Страница 4: ...o Adapt to different frequency schemes FCC ETSI o Change Gen2 specific parameters like BLF Coding Anti Collision Slots o Diagnostic Features RSSI Measurement Reflected Power Measurement o Support for sending AS3993 related direct commands o Advanced Tag Manipulations R W to different memory banks define passwords o Associate tags with other applications like media player o View and easily manipula...

Страница 5: ...7 Low cost MCU Microchip PIC24FJ64GB004 Indicator LEDs 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 Low Mid powered modules ...

Страница 6: ...ader Top 1 AS3993 UHF RFID AS3993 ams 2 Balun 2 1 Johanson Technology 3 Low pass filter 4 Directional coupler combination Johanson Technology 5 Antenna tuning circuit 6 Loop Filter 7 OAD pins for debugging purposes 8 Antenna Switch 9 Onboard antenna not populated 10 Internal PA matching Circuit 11 UART interface 12 Debug interface ...

Страница 7: ...ndicator RSSI www ams com Revision 2 0 6 22 12 page 6 17 13 SPI pin header for external MCU 14 Indicator LEDs 15 SMA female connector for external antenna Figure 2 Reader Bottom 1 MCU C8051F340 Silabs 2 USB connector 3 TCXO 4 LDO 5 V 3 5 V ...

Страница 8: ...gth Indicator RSSI www ams com Revision 2 0 6 22 12 page 7 17 5 Interfaces 5 1 USB Figure 3 USB Interface 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 ...

Страница 9: ...computer via UART it is recommend using an USB TTL serial cable with 3 3 Volt FTDI TTL 232R 3V3 WE The UART connection is established through P2 The 5 Volt power supply should be provided via the USB connector or J2 Figure 4 UART Interface Connections Note Once the firmware is programmed to communicate via UART the USB connecting is required to reprogram the FW ...

Страница 10: ...ved Signal Strength Indicator RSSI www ams com Revision 2 0 6 22 12 page 9 17 5 3 MCU Debug Interface To load the bootloader to the reader the debug interface connected to P4 should be used Figure 5 MCU Debug Interface ...

Страница 11: ...o be able to connect to an external MCU the 0 ohm resistors R17 R23 should be removed The SPI enable lines for the DTC are located on J6 and and are connected to the onboard controller via R14 and R15 Figure 6 SPI Interface Connections 5 5 OAD Pins Jumper J13 is connected to the OAD pins of the AS3993 which can be used to output analog digital RX subcarrier signals or TX RX based band signals Figu...

Страница 12: ...f the reader PCB contains all RF and UHF RFID relevant components On the bottom side the MCU and the power supply generation is placed The PCB has 4 layers with εr 4 5 dielectric constant 5 1 RF Tracks Impedance Calculation Figure 8 RF Tracks Impedance Calculation dimensions in mil 5 2 Reader Part PCB Stackup Figure 9 RF Part PCB Stackup ...

Страница 13: ... consisting of two shunt capacitors and a series inductor To enable a tuning of this circuit the shunt capacitors are extended by digital tunable capacitors DTC2 The capacitance change is controlled by the MCU via the SPI interface After the tuning circuit the RF signal can be switched to the SMA connector in case an external antenna is connected or to the onboard antenna3 Please note the onboard ...

Страница 14: ...AS3993 AN13 Received Signal Strength Indicator RSSI www ams com Revision 2 0 6 22 12 page 13 17 5 5 Schematics System Components Figure 10 Reader System Components ...

Страница 15: ...AS3993 AN13 Received Signal Strength Indicator RSSI www ams com Revision 2 0 6 22 12 page 14 17 Reader Section Figure 11 Schematic Reader Section RF Section Figure 12 Schematic RF Section ...

Страница 16: ...S3993 AN13 Received Signal Strength Indicator RSSI www ams com Revision 2 0 6 22 12 page 15 17 Tuning Circuit Figure 13 Schematic Tuning Circuit Controller Section Figure 14 Schematic Controller Section ...

Страница 17: ... AN13 Received Signal Strength Indicator RSSI www ams com Revision 2 0 6 22 12 page 16 17 Connector Section Figure 15 Schematic Connector Section Power Supply Section Figure 16 Schematic Power Supply Section ...

Страница 18: ... in normal commercial applications Applications requiring extended temperature range unusual environmental requirements or high reliability applications such as military medical life support or lifesustaining equipment are specifically not recommended without additional processing by ams AG for each application For shipments of less than 100 parts the manufacturing flow might show deviations from ...

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