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AS3993 – AN13 – Received Signal Strength Indicator (RSSI)

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Revision 2.0 / 6/22/12

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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. 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.

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 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 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 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 ...