Related Manuals for AMS AS3993
Summary of Contents for AMS AS3993
- Page 1 Application Note: UHF RFID Femto Reader HW-Description AS3993 UHF RFID Single Chip Reader EPC Class1 Gen2 Compatible www.ams.com Revision 1.0 / 2012/06/26...
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Page 2: Table Of Contents
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Table of Contents Introduction .......................... 2 Key Features ........................3 Applications ......................... 4 Reader System Overview ..................... 5 Interfaces ..........................7 USB .......................... 7 UART Interface ......................8 MCU Debug Interface ....................9 SPI Interface ...................... -
Page 3: Introduction
The Femto reader is designed as such that it can be easily connected to an external host MCU via SPI leaving the onboard MCU idle. The high level of integration found on the AS3993 UHF RFID AS3993 allows for minimal code loading and quick implementation. -
Page 4: Key Features
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 2. Key Features • Interface Between the Controller and Host Computer: USB (optional UART) SPI between an off-board controller and the AS3993 via a low cost pin header connection SMA (Female) connector for external antenna • Special... -
Page 5: Applications
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) • 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) •... -
Page 6: Reader System Overview
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 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. - Page 7 AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 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.
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Page 8: Interfaces
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 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. -
Page 9: Uart Interface
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 5.2 UART Interface In order to establish a connection to the host 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. -
Page 10: Mcu Debug Interface
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 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 www.ams.com Revision 2.0 / 6/22/12... -
Page 11: Spi Interface
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. Figure 7 - OAD Pads www.ams.com... -
Page 12: Reader System Description
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 5 Reader System Description The top side of 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 ε... -
Page 13: Rf Path
5.3 RF Path The RF signal is output at the AS3993 pins 16, 17 and 20, 21. Since the output impedance of the internal PA is not 50 ohm a load line matching network is required to deliver an maximum of power. -
Page 14: Schematics
AS3993 – AN13 – Received Signal Strength Indicator (RSSI) 5.5 Schematics System Components Figure 10 - Reader System Components www.ams.com Revision 2.0 / 6/22/12 page 13/17... - Page 15 AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Reader Section: Figure 11 - Schematic Reader Section RF Section Figure 12 - Schematic RF Section www.ams.com Revision 2.0 / 6/22/12 page 14/17...
- Page 16 AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Tuning Circuit : Figure 13 – Schematic Tuning Circuit Controller Section: Figure 14 - Schematic Controller Section www.ams.com Revision 2.0 / 6/22/12 page 15/17...
- Page 17 AS3993 – AN13 – Received Signal Strength Indicator (RSSI) Connector Section: Figure 15 - Schematic Connector Section Power Supply Section: Figure 16 - Schematic Power Supply Section www.ams.com Revision 2.0 / 6/22/12 page 16/17...
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Page 18: Copyright
No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of...
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