DEMO90121LR

DEMO90121LR RFID Long Range Demo User Manual Features and Benefits



Application Examples Output power of 1Watt Supports ISO15693 international standard RS232 communication 30$ BOM cost target
Asset tracking
Library’s book inventory control
Bicycle rental checkout Ordering Information Part No. DEMO90121LR Description Long Range Demonstrator 1 Scope 2 Related Melexis product The DEMO90121LR is a turnkey contactless long range reader example based on the RFID transceiver IC MLX90121. Once set up, it can inventory and access ISO15693 compliant tags and cards by sending corresponding commands. MLX90121 – 13.56MHz transceiver The DEMO90121LR is connected to a computer through its RS232 serial interface. The Melexis user interface program UT121 can be used for easy and fast evaluation of the demonstrator. The form factor is minimized to demonstrate the high level of integration allowed by the MLX90121. The bill of material for DEMO90121LR targets a cost of 30$ per component set for 1000 modules. Complete schematics, bill of material and layout are annexed to this document allowing a fast start for development work. Source code of the firmware is based on the FW90121 library and is available on the CD ROM provided with the DEMO90121LR. This device is based on ISO15693 RFID standard, maximizing the operating distance. This document includes fast start instructions, describes the performance of the demo and explains its hardware and software. The demo and documentation are a starting point for building customized long range reader systems by adapting the functions and performance to meet specific requirements. 390129012104 Rev 003 Important note: The device is for demonstration purpose and has not been tested for compliance with FCC, ETSI or any other regulations. Page 1 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual Table of Contents 1 Scope...........................................................................................................................................1 2 Related Melexis product.............................................................................................................1 3 Introduction.................................................................................................................................2 4 Box Content ................................................................................................................................3 5 Connections ................................................................................................................................4 6 Function and use ........................................................................................................................4 7 Observations...............................................................................................................................4 8 Hardware .....................................................................................................................................5 8.1 General ..................................................................................................................................5 8.2 MLX90121 Power Booster ....................................................................................................5 8.3 Progressive Field increase...................................................................................................6 8.4 Serial interfaces ....................................................................................................................6 8.5 Power supplies and LEDs ....................................................................................................7 8.6 SPI and Serial memory .........................................................................................................8 8.7 External push button ............................................................................................................9 8.8 Microcontroller ATmega8.....................................................................................................9 8.9 RFID Antenna ......................................................................................................................10 9 Firmware....................................................................................................................................12 9.1 Structure..............................................................................................................................12 9.2 Practical information ..........................................................................................................13 9.3 Instruction set .....................................................................................................................13 10 Conclusion ..............................................................................................................................14 11 Annexes...................................................................................................................................15 11.1 Schematics........................................................................................................................15 11.2 List of components...........................................................................................................17 11.3 RFID Antenna Layout .......................................................................................................19 3 Introduction You purchased a DEMO90121LR. Thank you for choosing Melexis RFID solutions. This document contains the instructions to use and evaluate the functions and the performance of this demonstrator. All the necessary hardware is provided in the packaging box and the microcontroller on-board is pre-programmed with the firmware on the included CD. All that you need to do is connect the cables, start the UT121 user interface program, and then to send predefined ISO15693 commands to see the displayed answer from a compatible transponder(s) placed in front of the long range antenna. Should you want to start a development based on this demonstrator, you will find in this document and on the CD all information, like schematics, board layout, list of components, firmware source (C code) and the related application note. Please note that all this material is provided to support the use of the related Melexis product. Duplication, circulation or storage on data carriers in any manner for any other type of use are not authorized by Melexis unless under a specific agreement. 390129012104 Rev 003 Page 2 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 4 Box Content You will find in the box the following components. • 1 RFID Reader Board Power supply connector Antenna connector (SMA) RS232 connector Figure 1: RFID reader board. Top side • 1 Board antenna Figure 2: Antenna ANT3_0 390129012104 Rev 003 Page 3 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual • • • • • 3 Transponder (Inlays or cards) ISO15693 1 Power supply block with adaptor 1 serial cable RS232 1 CD with the firmware and documentation The delivered CD contains the complete documentation of the hardware and firmware for DEMO90121LR, User Manual, Datasheet MLX90121, Source Code of the firmware (written in C, flavor AVR gcc), Hex file of the firmware, Bill of materials of the board, UT121 software (PC user interface) 1 Box Content (on paper) 5 Connections The first step is to connect the component. Connect antenna board to the RFID reader board using the SMA connector. Then, connect the serial cable from the computer to the RS232 connector (CON5). Finally, connect the power supply block to the jack connector (CON6). The two LEDs D5 and D6 must be switched ON. Important note: Should you want to connect you own power supply, please note that in order to avoid extra power dissipation, a maximum power supply (CON6) of 15 volts must be applied. 6 Function and use Once connected, the demonstrator is able to receive commands sent through the RS232 serial interface. The firmware of the DEMO90121LR handles the RFID communication, according to the ISO15693 international standard up to the level 2. Meaning that the Start Of Frame, the End Of Frame and the CRC calculation and check is supported by the firmware while, the protocol understanding has to be managed by a higher level of application software. The communication with the long range demonstrator can be established by any RS232 terminal by configuring the following parameters: • • • • • Data rate = 57600 BAUD Data bit = 8bits Parity = None Stop bits = 1 Flow control = Hardware For an easy and fast evaluation, the DEMO90121LR is supplied with the UT121 Melexis user interface. For more information on how to install and use the UT121, please refer to the documentation DVK90121 User Manual. After starting the user interface program, one will have access to a list of predefined commands to start the communication with the demonstrator and with the ISO15693 transponders. For more information on the command format supported by the DEMO90121LR, please refer to the chapter Firmware below. 7 Observations • • • • The delivered output power is 1 Watt to a 50-ohm load. Reading range of the DEMO90121LR is about 28cm in ISO15693 dual sub-carrier. The power consumption with the field ON is about 300 mA. The DEMO90121LR supports the Anti-collision procedure. Therefore, several transponders can be put in the field and the Anti-collision command can be sent. The unique identifier (UID) of every transponder detected will be returned. 390129012104 Rev 003 Page 4 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 8 Hardware 8.1 General The DEMO90121LR is built around the MLX90121 RFID transceiver front-end and the 8bit microcontroller Atmel ATMega8. The MLX90121 handles the air interface in transmission and in reception. It drives the antenna through a power booster configuration to provide up to 1Watt of output power to the 50-ohm antenna. It demodulates the tag answer using an external diode detector to reduce the power fed into the MLX90121 reception pin. The ATMega8 runs the protocol and the application software. The board has three interfaces, two for the RS232 and RS485 serial interfaces and a SPI connection for the uC programming. It includes a reset button and two linear regulators of +5 and +12V DC. 8.2 MLX90121 Power Booster The power booster schematic is implemented according to the application note “A Power Booster for the MLX90121” included in the “MLX90121 Cookbook”. For more information about the theory of operation, please refer to this document available on the Melexis WEB-site. L1 Vdd BLM31AJ260SN1 C4 4.7UF/TANTAL C5 L3 680NH GND_1W Close to MLX90121 pin 2 3.3UH 1 R3 10E short! short! 3 330PF R5 680 C14 C15 220Pf 100NF U2 1 D3 BAS16 1 L6 GND_TX 1 GND_TX 2 short! 1 1 3 GND R10 51 M1 PMBF170 1 10K 6 7 13.56MHZ 2 GND_1W C22 22PF GND_uC R13 10M 9 RTB 1 C21 22PF 8 2 MSI R12 2 1 short! Y1 2 GND_1W 3 5 short! GND_TX R11 6.8 2 Close to ANTENNA connector 4 Close to MLX90121 pin 3 1 TP1 R6 27K MLX90121 GND_RX Close to MLX90121 pin 2 GND_TX 5V BLM31AJ260SN1 2 GND_1W C13 270NH 4 GND_1W GND_1W 3 GND_1W L7 GND_1W 10 VDD1 TX RX VSS3 MOD NC VSS1 VDD3 XOUT DSY NC XIN VSS2 XBUF CK MODE DIN NC VDD2 RTB DOUT C19 D4 20 3 19 18 2.2NF RSSI R8 22K GND_RX 17 short! 16 DSY NC 15 CK 14 MODE 13 DIN GND_RX 12 11 1 BAR18 Det_in 2 Q2 IRFD110 100PF/100V/NPO 4.7UF/TANTAL GND_TX C20 100PF R9 1K5 1 2 2 10NF C18 GND_TX 2 2.2UH CV1 5.5-50PF/200V C10 XXPF/200V 100NF C9 33PF 1 GND_1W short! 2 C8 1 short! L5 short! short! C6 1 100nF/50V L4 ANTENNA1 1 2 2 C3 100NF 1 5V 1 L2 560NH C12 Edge of the board 2 short! Det_in GND_RX GND_1W 5V DOUT C23 100NF short! TAG Reader MLX90121 GND_TX CLK13M C24 220PF GND_uC Figure 3: TAG Reader MLX90121 in power booster configuration The output of the long range reader is matched for 50-ohm loads. In case other impedance values or more filtering are required, the capacitor C10 can be mounted to form a π filter with L4 and CV1. The output power supply Vdd is fixed to 12V by a linear regulator to provide 1 watt of output power. The modulation depth is fixed to about 100% according to the ISO15693 specification. The resistors R10, R12 and the transistor M1 are anticipated in the layout to adjust the modulation depth on the fly by the microcontroller. This function is not used in the DEMO90121LR and these components are not mounted. To avoid any perturbation, the MLX90121 use its own 13.56MHz signal provided by the crystal resonator Y1. This signal can be supplied by the microcontroller ATmega8 by replacing the capacitor C24 with a jumper wire. Care should be taken that the crystal oscillator has to be removed and the microcontroller has to be configured to be able to drive the clock of the MLX90121. To improve the performance of the long range reader, the external diode detector solution was chosen to receive the modulation signal from the transponder (R9, D4, C20, R8 and C19). The C12 capacitor decouples the DC level to protect the diode of the detector from high voltages. 390129012104 Rev 003 Page 5 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 8.3 Progressive Field increase It has been observed that some RFID transponders do not operate properly when the field intensity reaches its maximum in a very short time. Consequently, a progressive field increase mechanism was implemented. For more information about the theory of operation, please refer to the application note “Progressive Field Increase for the MLX90121” in the “MLX90121 Cookbook” available on the Melexis internet site (www.melexis.com). 2 1 12V R1 4K7 1 C2 100NF 2 C1 10UF/TANTAL 4 6 C11 100NF 5 S2 D2 G2 R2 2K2 3 1 Vdd 2 Q1 2 D1 R4 S1 G1 1 2 1 PFI 10K FDC6327C Figure 4: Soft Start PWM Drive Important note: The Progressive field increase method is not implemented in the version 1.0 of the firmware but could be in the next revision. Please contact your Melexis representative to get the last revision of the firmware. The description of the change in the revision list of the firmware will give an indication if the function has been implemented. 8.4 Serial interfaces The demonstrator can be externally controlled with an RS232 (CON5 or CON3) or RS485 (CON2) serial interfaces. The reception signal Rx can be selected from RS232 or RS485 by firmware with the bit RS232_485. C42 +5V 100NF 14 U7A GND_uC 1 RX232 74HC00PW 2 U7B 14 3 6 7 14 4 U7C 74HC00PW 5 8 U7D 74HC00PW 10 7 RX 14 9 12 RX485 11 RS232_485 7 7 74HC00PW 13 GND_uC Figure 5: RS485/RS232 Rx signal switch The RS232 allow for connecting the board to a serial COM port of a computer through the serial connector RS232. The voltage level is adapted using the MAX202 RS232 transceiver (U1). TX U1 RX232 9 10 11 12 C40 1 3 4 5 2 6 100NF C41 100NF C43 C44 1uF 100NF R2OUT VCC T2IN GND T1IN R1OUT C+ C1C2+ C2V+ V- T1OUT R2IN R1IN T2OUT MAX202CSE 16 15 +5Vser C39 100NF CON3 14 8 13 7 3 2 1 GND_Ser RS232 +5Vser GND_Ser 390129012104 Rev 003 Page 6 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual Figure 6: RS232 transceiver The RS485 is a complement to the RS232 serial connection as it allows connecting several devices on the same bus. The voltage level conversion is controlled by the LMS485 transceiver (U6). The communication is controlled by the signals 485_DE (Output driver enabled, for DATA transmission). A termination load of 120ohms (R27) is also available to correctly match the end of the RS485 cable (Jumper CON4). L8 +5Vser +5V 1 BLM31AJ260SN1 C38 4.7UF/TANTAL CON4 GND_Ser 485_DE DI GND_Ser 1 4 2 2 CON2 3 2 1 B82789 1 RO 5 LMS485IM 3 L11 D12 SMBJ12CA DE RE 6 7 A B 1 2 RS485_TER D11 SMBJ12CA 3 2 VCC GND 4 8 U6 TX R27 120 GND_Ser 1 2 C36 100NF RS485 GND_Ser RX485 GND_Ser GND_Ser Figure 7: RS485 8.5 Power supplies and LEDs The DEMO90121LR is supplied through the connector CON6. A protection diode D1 protects the board from supply inversion while a suppression diode D2 protects against over voltage. Two linear regulators have been chosen to provide clean power supplies of +12 volts for the power booster circuit and +5 volts for the MLX90121 and the microcontroller. Two LEDs are available at the output of the regulators (D5 and D6) to indicate operation of the power supplies. D1 1 2 30BQ060 SMD Or CON1 Vpower F1 2 1 0451.500MRL 1 1 D2 D1 and F1 SMBJ22A not assembled in the same time C7 10UF/TANTAL/35V 2 POWER Edge of the board 2 U10 VI VO 3 12V 2 7812C 2 C16 100NF R7 7K5 C17 100NF 1 1 GND Vpower 1 D5 2 +5V L9 VO BLM31AJ260SN1 R14 7K5 2 C27 100NF 5V C25 10UF/TANTAL 1 C26 100NF 2 7805C 1 VI 3 2 1 GND U3 Vpower 1 D6 2 Figure 8: Power supplies 390129012104 Rev 003 Page 7 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual Three additional LEDs can be controlled by the firmware. In the version 1.0 of the firmware, the LEDs D8, D9 and D10 will be always switched ON. 1 1 R26 7K5 1 R24 7K5 1 R23 7K5 2 LEDgeneral 2 LEDserial 2 LEDmlx 1 1 D8 D9 2 D10 2 GND_uC 2 GND_uC GND_uC Figure 9: LEDs 8.6 SPI and Serial memory An external serial memory of type FRAM is available to store the current UIDs of the RFID transponders inventoried in the field, in stand alone mode. It is accessed by the microcontroller through the SPI serial interface (MISO, MOSI and SCK). The FRAM has to be selected using the signal EEPROM_CS. 1 MOSI 5 SCK 6 5V 3 7 |CS SO 2 MISO SI 5V SCK |WP |HOLD VSS EEPROM_CS VCC 8 5V U4 C29 100NF 4 FM25C160 GND_uC GND_uC Figure 10: Serial memory Important note: The stand alone application is not implemented in the version 1.0 of the firmware but could be in the next revision. Please contact your Melexis representative to get the latest revision of the firmware. The description of the change in the revision list of the firmware will give an indication if the function has been implemented. The connector J1 is used to program the microcontroller with the application firmware. R15 1 5V C28 100NF + + + + + ISP + + + + + 1 3 5 7 9 MOSI CH_MOSI RST CH_RST CH_SCK CH_MISO 1K R17 1 2 SCK 1K R19 1 2 MISO J1 2 4 6 8 10 2 1K R16 1 2 GND_uC 100 Figure 11: Microcontroller programming 390129012104 Rev 003 Page 8 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 8.7 External push button The button BUTTON1 is used to perform hardware reset of the DEMO90121LR board. Important note: The extra button BUTTON2 is not implemented in the version 1.0 of the firmware but could be in the next revision. Please contact your Melexis representative to get the latest revision of the firmware. The description of the change in the revision list of the firmware will give an indication if the function has been implemented. R25 8K2 1 1 2 3 5V D7 BAS16 1 R22 8K2 2 5V 2 RSTsof t 2 RST BUTTON1 C37 100NF BUTTON2 4 3 C45 1NF 4 3 1 1 BUTTON_RESET BUTTON_RSTSOFT GND_uC GND_uC GND_uC GND_uC Figure 12: Push buttons 8.8 Microcontroller ATmega8 The DEMO90121LR is controlled by an Atmel microcontroller ATmega8. It contains the firmware example written by Melexis to handle the RFID communication and the serial communication with a computer. The microcontroller also controls the progressive field increase (PFI) block, the external FRAM through the SPI serial interface, the RS232/RS485 selection and the LEDs. TX RX RST RSTsof t LEDserial LEDmlx MSI DSY NC short! short! 13.56MHZ 1 R21 10M C34 22PF C33 100NF C35 22PF R20 8K2 RSSI_f il short! C32 100NF GND_ADC GND_ADC GND_uC GND_uC C31 10NF 9 10 11 12 13 14 15 16 2 short! RSSI C30 10NF PD5 PD6 PD7 PB0 PB1 PB2 PB3 PB4 Y2 485_DE EEPROM_CS 2 R18 100 L10 24 23 22 21 20 19 18 17 PD3 PC1 PD4 PC0 GND ADC7 VCC ATmega8 GND GND ATMEGA8-16AU AREF VCC ADC6 PB6 AVCC PB7 PB5 1 1 2 3 4 5 6 7 8 BLM31AJ260SN1 DOUT CK 5V 32 31 30 29 28 27 26 25 U5 PD2 PD1 PD0 PC6 PC5 PC4 PC3 PC2 5V CLK13M GND_uC GND_ADC GND_ADC SCK MISO MOSI DIN RTB MODE RS232_485 PFI LEDgeneral Figure 13: Microcontroller ATmega8 390129012104 Rev 003 Page 9 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual The microcontroller contains its own 13.56MHz crystal oscillator. When correctly programmed (fuse CKOPT has to be checked), this 13.56MHz clock generation can be used to drive the MLX90121 by short circuiting the resistor R18. The following table shows the digital connections between the I/O of the microcontroller and the different blocks of the long range demonstrator. MLX90121 PD2 ↔ PD3 ↔ PD4 ↔ PD5 ↔ PD6 ↔ PD7 ↔ DSYNC DOUT CK DIN RTB MODE Data Synchronization Data OUT Clock Data IN Receive/Transmit Config/Comm LEDs PB0 ↔ PC3 ↔ PC4 ↔ LEDgeneral LEDmlx LEDserial Not used RFID communication Serial communication PFI block PB1 ↔ PFI Progressive field incr. Reset PC6 ↔ RST Reset Serial communication RS232/RS485 PB2 ↔ RS232_485 RS232/485 selection PC1 ↔ 485_DE RS485 driver enable PD0 ↔ RX Reception Transmission PD1 ↔ TX External FRAM PC0 ↔ EEPROM_CS Serial FRAM selection SPI PB3 PB4 PB5 Maste Out Slave In Master In Slave Out Serial Clock ↔ ↔ ↔ MOSI MISO SCLK Table 1: Connections to microcontroller ATmega8 8.9 RFID Antenna A 50-ohm antenna is supplied with the demonstrator. It is a loop 12x12 square antenna shielded on one side and matched to 50-ohms. Following schematic shows the principle of the antenna: Figure 14: Antenna principal schematic The loop antenna is formed by an inductance Lant of 523nH and a serial resistor Rant of 290mOhm. The natural quality factor of the antenna (154 at 13.56MHz) is too big to allow a correct communication at 26kbps (ISO15693) and has to be reduced by adding the serial resistor Rs of 800mOhm. The loop antenna is matched to 50-ohm by using two capacitors Cs and Cp. The serial one Cs is used to adjust the resonance frequency and the parallel one is used to adjust the matching on 50-ohms at 13.56MHz. 390129012104 Rev 003 Page 10 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual Below are the measured values of the long range antenna: • • • • • • Lant = 523nH (calculated). Rant = 290mOhm (calculated). Rs = 800mOhm. Cs = 270pF. Cp = 1nF + 220pF. Qant = 17 (measured) Orcad schematics and layout of the antenna are provided in Annexes A and B. The following serial resistor and serial and parallel capacitors have been calculated to provide a resistive 50ohm load at 13.56MHz. • • • Rs = 1 ohm Cs = 330pF+10pF+ trimmer capacitor Cp = 1.2nF Remarks: The resistive element of the RFID antenna will dissipate the complete amount of power. Therefore, Rs has to be dimensioned to dissipate at least one watt. Moreover, the quality factor and the voltage swing of the capacitors which form the matching network have to be chosen as high as possible. Mica capacitors have quality factor of about 1000 and support voltage swing up to 200V. 390129012104 Rev 003 Page 11 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 9 Firmware 9.1 Structure The firmware of the DEMO90121LR handles the RS232 serial communication with a computer as well as the communication with the MLX90121 RFID reader. It can be illustrated by the following flow chart. UART Bios (Bios.c) Common level USART & Parser (Comm.c) Library Data reception and transmission, data buffering Set of routines to facilitate parsing of received data and sending of data Application 1st level Parser (Exec.c) Protocol oriented command Application-specific parsers (Parser.c) Device direct command Protocol specific parsers (Iso15par.c) Library Protocol level Inventory (Iso15ac.c) Error code interpretation (ErrorCodes.c) Common level Protocol basic (Iso15.c) TAG recv. buffer (IsoX.c) Platform level Mlx90121 direct access (MLX90121.c) ATmega8 direct access (Crt8.c) TAG 390129012104 Rev 003 Page 12 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 9.2 Practical information The firmware of the DEMO90121LR is based on the FW121 library. (FW90121: Firmware description) This library provides the ISO15693 protocol functions as specific commands to control the MLX90121 and address its internal registers. At power-on or reset, the microcontroller IO ports, timers, ADC, and watch-dog, and the MLX90121 transceiver registers are configured for the ISO15693 protocol as described in the MLX90121 datasheet. The firmware was developed using GCC under AVR Studio 4. The firmware can be loaded into the microcontroller using the SPI interface connected to a STK500, STK300, AVRISP mkII module or similar, driven by appropriate software (AVR Studio, PonyProg2000, etc). FW_LR21_15.c and FW_LR21_15.h contain the firmware specific gcc code and the functions’ prototypes. HwDefs.h describes the hardware (input, output pins, etc.). The file FW_LR21_15.aps is the AVR Studio 4 project file. 9.3 Instruction set The instructions sent to the DEMO90121 are composed by ASCII parameters which form the operational code (op-code) and the command parameters. Three main types of command can be sent, MLX90121 registers configuration, RFID commands and Anti-collision sequence. MLX90121 registers configuration The write register command starts with the op-code WrReg followed by the hexadecimal values of the MLX90121’s 13 registers from register 0 to register 12. WrReg R0R0R1R1R2R2R3R3R4R4R5R5R6R6R7R7R8R8R9R9R10R10R11R11R12R12 ↵ Identification The identification command is used to identify the module. It has to be sent accordingly. Idn ↵ RFID commands The RFID commands start with the op-code Iso15 followed by a variable number of Hexadecimal parameters which form the RFID command. It has to be filled in accordance with the international standard specification ISO15693-3. The instruction is ended by several key words according to the command itself. Iso15 ISO15693 parameters CRC SLOTx ↵ CRC: The firmware will automatically calculate the CRC according to the ISO15693 specification and will incorporate it into the command sent to the transponder. SLOTx: Define the number of slots used during an Inventory or Write command. X must be between 1 and 16. Anti-collision sequence The firmware will execute a complete anti-collision sequence as defined in the ISO15693-3 specification. All the detected UIDs will be returned. The anti-collision command will not select any transponder. Iso15 Inventory DS ↵ DS: Specified only when using dual sub-carrier protocol. With single sub-carrier, DS has to be removed. 390129012104 Rev 003 Page 13 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 10 Conclusion The DEMO90121LR is an example of a small, cost effective, and simple control module for long range applications, based on the Melexis 13.56MHz transceiver MLX90121. It can also be considered as an advanced starting point for developers who want to build their own customized system meeting their specific requirements. The software library FW121 facilitates software development for the MLX90121 transceiver, and the programmer can use high level commands to communicate with the MLX90121. By this way, they can concentrate on the management of the microcontroller and the upper level functionality of the application. References • • • • • • • source files: FW_LR21_15.h, FW_LR21_15.c, FW_LR21_15.aps, Bios.c, Exec.c, Parser.c, Iso15Par.c, HwDefs.h. schematics: See below MLX90121 datasheet ATMega8 datasheet FW90121: Firmware description 13.56MHz RFID systems and antennas design guide DVK90121 User Manual 390129012104 Rev 003 Page 14 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 11 Annexes 11.1 Schematics DEMO90121LR: D1 L1 1 1 13.56MHZ 2 10K C21 22PF GND_1W 8 C22 22PF GND_uC R13 10M 9 RTB 10 GND_1W 2 2 1 2 1 VSS3 D5 MOD NC VSS1 VDD3 XOUT DSY NC XIN CK VSS2 MODE XBUF DIN NC VDD2 RTB DOUT C19 D4 20 3 19 2.2NF 18 RSSI short! Det_in BAR18 R8 22K GND_RX 17 1 C20 100PF 2 R9 1K5 +5V L9 16 DSYNC 15 CK 14 MODE 13 DIN U3 GND_RX GND_RX GND_1W Vpower 1 VI VO 3 R14 7K5 7805C C26 100NF 12 C27 100NF DOUT C25 10UF/TANTAL 1 5V 11 5V BLM31AJ260SN1 1 7 12V R7 7K5 C17 100NF 2 Y1 RX 2 3 VDD1 TX 7812C 1 1 1 M1 PMBF170 R12 1 6 short! 1 2 GND_TX R11 6.8 2 MSI 5 short! 2 GND_1W 4 Close to MLX90121 pin 3 2 1 1 3 Close to ANTENNA connector MLX90121 GND_RX 1 GND_TX 2 R10 51 GND C16 100NF R6 27K 100NF U2 GND_TX short! TP1 1 C15 220Pf Close to MLX90121 pin 2 GND_TX Vpower 5V 1 R5 680 1 D3 BAS16 C14 C7 10UF/TANTAL/35V GND L6 BLM31AJ260SN1 330PF 2 3 GND_1W GND_1W C13 270NH 4 GND_1W GND_TX 2 short! L7 short! 3 GND_1W GND_TX R3 10E Q2 IRFD110 100PF/100V/NPO C9 33PF Vpower 1 D2 D1 and F1 SMBJ22A not 2 assembled in the same timeU10 1 3 VI VO 2 Close to MLX90121 pin 2 1 1 2 10NF C18 CV1 5.5-50PF/200V C10 XXPF/200V 2 POWER Edge of the board 1 GND_1W 3.3UH 4.7UF/TANTAL 2 GND_1W short! short! short! 2.2UH C6 100NF 2 C5 L3 680NH 0451.500MRL GND C4 4.7UF/TANTAL 2 L5 C8 F1 2 1 1 ANTENNA1 1 short! 2 C3 100NF 2 100nF/50V L4 2 30BQ060 SMD Or CON1 5V 1 L2 560NH C12 Edge of the board 1 Vdd BLM31AJ260SN1 short! Det_in D6 C23 100NF Current too small (3V/7k5=0.4mA) short! 2 GND_TX TAG Reader MLX90121 C24 220PF CLK13M GND_uC Supply TX RX TX U1 RST RSTsof t RX232 LEDserial LEDmlx MSI 14 7 U7D 14 1 12 C36 100NF RX485 GND_Ser 7 GND_uC RS485/RS232 RX Signal Switch 3 2 DI DE RE 6 7 A B 1 4 2 J9 1 2 8 |HOLD 5V C29 100NF J10 R15 5V 2 FM25C160 GND_uC GND_uC R22 8K2 LEDserial GND_uC Serial EEPROM R25 8K2 D7 BAS16 RST R24 7K5 1 debug connector C28 100NF RSTsof t BUTTON2 4 3 C45 1NF 4 3 2 1 BUTTON_RSTSOFT 1 6 C11 100NF 5 GND G2 RST CH_RST CH_SCK CH_MISO 1 1K R17 2 SCK 1 1K R19 2 MISO GND_uC MOSI GND_uC uC reset circuit 100 GND_uC ISP Interface for uC GND_uC Soft reset circuit LEDgeneral R2 2K2 3 R26 7K5 Close to CON1 D1 S1 1K R16 2 1 D2 1 3 5 7 9 2 2 S2 1 4 GND_uC + + + + + 1 2 Q1 2 Vdd GND_uC 2 TP2 + + + + + ISP 1 1 D9 R1 4K7 2 4 6 8 10 BUTTON_RESET 12V C2 100NF 2 1 J1 BUTTON1 C37 100NF 1 CH_MOSI 5V 1 C1 10UF/TANTAL GND_Ser D8 |WP 2 J8 1 SCK 2 1 6 1 7 SCK 2 3 J7 GND_Ser 1 5V 2 MSI J6 1 SI 3 PFI J5 1 GND_Ser RS485 R23 7K5 2 MISO 2 DSY NC 5 SO 1 RTB MOSI 5V 1 |CS 1 DOUT J4 1 1 1 DIN U4 EEPROM_CS VCC MODE J3 VSS GND_uC J2 1 4 CK 3 2 1 RS485 RX485 Serial Interface LEDmlx 5 LMS485IM GND_Ser 5V CON2 B82789 1 RO LEDgeneral 1 RS485_TER D12 SMBJ12CA 4 485_DE 3 L11 D11 SMBJ12CA TX PFI R27 120 GND_Ser 1 2 2 RS232_485 U6 RS232_485 uC (ADC, protocol, memory) CON4 2 74HC00PW 13 1 SCK MISO MOSI +5V BLM31AJ260SN1 C38 4.7UF/TANTAL 11 8 GND_uC +5Vser 9 8 RX 74HC00PW 10 DIN RTB MODE RS232 L8 6 74HC00PW 5 GND_ADC GND_ADC RS232 100NF GND_Ser VCC GND GND_uC GND_uC 3 2 1 GND_Ser 4 U7C C32 100NF GND_ADC GND_ADC CON3 +5Vser RX232 7 C33 100NF C35 22PF C39 100NF 14 8 13 7 GND_uC 1 74HC00PW 2 7 1 C34 22PF 100NF +5Vser MAX202CSE 14 13.56MHZ R21 10M C44 T1OUT R2IN R1IN T2OUT 16 15 3 U7B C31 10NF 9 10 11 12 13 14 15 16 2 short! C43 1uF U7A R20 8K2 RSSI_f il short! C+ C1C2+ C2V+ V- 100NF +5V C30 10NF PD5 PD6 PD7 PB0 PB1 PB2 PB3 PB4 Y2 PC1 PD3 PD4 PC0 GND ADC7 GND VCC ATmega8 GND ATMEGA8-16AU AREF VCC ADC6 PB6 AVCC PB5 PB7 C42 RSSI 14 short! 485_DE EEPROM_CS 2 R18 100 short! L10 24 23 22 21 20 19 18 17 1 1 2 3 4 5 6 7 8 BLM31AJ260SN1 DOUT CK PD2 PD1 PD0 PC6 PC5 PC4 PC3 PC2 CLK13M C41 5V 32 31 30 29 28 27 26 25 U5 R2OUT VCC T2IN GND T1IN R1OUT 1 3 4 5 2 6 100NF DSY NC 5V 9 10 11 12 C40 1 R4 G1 1 2 D10 1 PFI 10K FDC6327C 2 Soft start PWM drive GND_uC LEDs 390129012104 Rev 003 Page 15 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual RFID ANTENNA: RS1 R 2 CAP CAP CAP CAP CAP 1 1 1 1 390129012104 Rev 003 Coax J1 2 1 IN GND 2 CP4 2 CP3 2 CP2 2 CP1 CV1 5-50pF 1 CS4 2 CAP 1 CS3 2 CAP 1 CS2 2 CAP CS1 1 5-50pF CV2 RS2 R Pad1 1 Copper Antenna Page 16 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 11.2 List of components DEMO90121LR: Quantity 1 1 1 1 1 1 1 1 2 3 1 21 1 1 3 1 1 1 1 2 1 2 4 1 1 1 1 2 2 2 3 1 9 2 5 1 1 1 390129012104 Rev 003 Reference Value ANTENNA1 BUTTON1 BUTTON2 CON1 CON2 CON3 J1 CV1 C1,C25 C4,C6,C38 C7 C2,C3,C5,C11,C14 C16,C17,C23,C26,C27 C28,C29,C32,C33,C36 C37,C39*,C40,C41,C42 C44 C43 C12* C8,C30,C31 C19 C45 C9* C10* C18,C20 C13 C15 C21,C22,C34,C35 C24* D1 D4 D2 D11,D12 D3,D7 D5,D6 D8,D9,D10 F1* J2*,J3*,J4*,J5*,J6*,J7*,J8* J9*,J10* TP1,TP2 L1,L6,L8,L9,L10 L2 L3 L4 Description SMA Reset RSTsoft Power supply RS485 RS232 ISP Connector 5.5-50pF 10uF 4.7uF 10uF Antenna connector Push button Push button Connector Connector Connector Connector Trimming capacitor Tantalum capacitor Tantalum capacitor Tantalum capacitor 100nF Ceramic X7R capacitor 1uF 100nF 10nF 2.2nF 1nF 33pF xxpF/200V 100pF 330pF 220pF 22pF 220pF 30BQ060 BAR18 SMBJ22A SMBJ12CA BAS16 Red LED Yellow LED 0451.500MRL Ceramic X7R capacitor Ceramic X7R capacitor Ceramic X7R capacitor Ceramic X7R capacitor Ceramic X7R capacitor Ceramic NPO capacitor Ceramic NPO capacitor Ceramic NPO capacitor Ceramic NPO capacitor Ceramic NPO capacitor Ceramic NPO capacitor Ceramic NPO capacitor Schottky diode Schottky diode Suppression diode Suppression diode Commutation diode QTLP630C-Y Fuse PIN_HEADER_SIL1 Test pin Gnd BLM31AJ260SN1 560nH 680nH 2.2uH Ground connection EMI filter inductor Matching coil Matching coil Matching coil Page 17 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 1 1 1 1 1 1 1 1 2 1 1 5 1 1 1 1 1 3 2 3 1 L5 L7 M1* Q1 Q2 R1 R2 R3 R12*,R4 R5 R6 R7,R14,R23,R24,R26 R8 R9 R10* R11 R13*,R21* R15,R16,R17 R18*,R19 R20*,R22,R25 R27* SH1,SH2,SH3,SH4 SH5,SH6,SH7,SH8 SH9,SH10 U1 U2 U3 U8 U4 U5 U6 U7 Y1,Y2 10 1 1 1 1 1 1 1 1 2 3.3uH 0.27uH PMBF170 FDC6327C IRFD110 4K7 2K2 10E 10K 680 27K 7K5 22K 1K5 5,6 6,8 10M 1K 100 8K2 120 Matching coil Matching coil 10% modulation transistor Soft start PWM transistor Power booster transistor Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 1206 Thick film resistor 1206 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 Thick film resistor 0805 1ohm Ground plane shunt MAX202CSE MLX90121 7805C 7812C FM25C160 ATmega8-16AU LMS485IM 74HC00PW 13.56MHZ RS232 transceiver RFID transceiver +5V regulator TO220 +12V regulator TO220 Serial FRAM Microcontroller RS485 transceiver 4 NAND logical circuit Quartz resonator RFID ANTENNA: Quantity 1 3 1 2 1 1 1 1 1 Reference CP1 CP2*, CP3*, CP4* CV1* CS1*,CS2* CS3 CS4 CV2 RS2 RS1* Value 1.2nF 5-50pF 10pF 330pF 5-50pF 1-ohm - Description Ceramic COG/NPO capacitor Ceramic capacitor Trimer capacitor Ceramic capacitor Ceramic NPO capacitor Ceramic NPO capacitor Trimer capacitor Thick film resistor Thick film resistor *These components are not mounted. 390129012104 Rev 003 Page 18 of 19 User Manual Dec. 2009 DEMO90121LR RFID Long Range Demo User Manual 11.3 RFID Antenna Layout 390129012104 Rev 003 Page 19 of 19 User Manual Dec. 2009