EVB90121 MLX90121 Evaluation Board Features and Benefits Output power up to 200miliwatts Complies with standard ISO15693 and ISO 14443 protocols Programmable encoder for custom protocol Short to medium reading range applications Matching network optimized for 50 ohm antenna impedance 10 pins connector for communication with a microcontroller Board voltage supplied by a jack connector from 6 to 9 Volts DC Internal power supply of the board between 3 Volts and 5 Volts DC Ordering Information Part No. EVB90121 Applications Examples Evaluation Board EVB90121 Freight identification systems Smart labels and write systems Access control systems General Description The EVB90121 is an assembled module that allows to evaluate the advantages of the MLX90121 13MHz transceiver IC and to facilitate the development of RFID applications. The board voltage is supplied by a jack connector from 6 to 9 Volts DC. The internal power supply of the board can be chosen between 3 Volts and 5 Volts DC by putting the corresponding jumper up or down. A suppression choke reduces the supply noise. The matching network can be adjusted through CV1 capacitor and thus can be optimized to transmit full electromagnetic power up to 200mWatt to a 50-ohm load antenna connected on a SMA connector. All digital inputs/outputs from the MLX90121 are connected to a standard 10 pins connector. This allows easy connection to a microcontroller. 390129012101 Rev 001 Page 1 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board Table of Contents 1 SCHEMATIC................................................................................................................................................................................ 3 2 PHYSICAL OUTLINE ................................................................................................................................................................... 4 3 COMPONENTS............................................................................................................................................................................ 5 4 GUIDELINES ............................................................................................................................................................................... 6 4.1 POWER SUPPLY ..................................................................................................................................... 6 4.2 ANTENNA CONNECTION ........................................................................................................................... 6 4.3 CONNECTION TO A MICROCONTROLLER .................................................................................................... 6 4.4 ANALOGUE OUTPUTS .............................................................................................................................. 7 5 DISCLAIMER............................................................................................................................................................................... 8 390129012101 Rev 001 Page 2 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board 1 Schematic The schematic if the MLX90121 evaluation board is shown in figure 1. Figure 1: Schematic of the evaluation board EVB90121 390129012101 Rev 001 Page 3 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board 2 Physical outline Figures 2 and 3 show the outline of the MLX90121 evaluation board. Figure 2: MLX90121 evaluation board outline: top side Figure 3: MLX90121 evaluation board outline: bottom side 390129012101 Rev 001 Page 4 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board 3 Components The table below gives an overview of all components that composed the evaluation board EVB90121. Reference R1 R2 R3 R4 R5,R6,R7,R8,R9,R10 CV1 C1,C2,C3,C6 C4 C5 C7 C8,C9,C12 C10,C11 D1,D2 JP1 JP2 J1 J2 L1 L2 L3 L4 U1 U2 U3 Y1 Value 7,5 k 4,7 k 4,7 k 12 1k 5-50 pF 10uF 33 pF 10 nF 47 pF 100 nF 22 pF ??? SMA connector DIL10 connector Jack connector Debug connector VK200 4,7 H 5,6 H 1,2 H XC62FP XC6201 MLX90121 Crystal Description Tuned capacitor used to adjust the matching network to 50-ohm. Decoupling capacitors, Tantale type Red Leds Connection to a 50 ohms antenna Connection to a microcontroller Power supply connection Noise suppressor choke +5Volts regulator, package SOT23 +3Volts regulator, package SOT23 MLX90121CA device, package SSO20 Crystal oscillator Table 1: Components 390129012101 Rev 001 Page 5 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board 4 Guidelines This chapter describes all connections and jumpers available on the EVB90121 circuit to be able to use it in the most efficient way. 4.1 Power supply • The circuit can be supplied with a standard DC supply block (transformer or switch mode power supplies) connected to the jack connector J1. The input supply can be selected from 6 to maximum 9 volts DC to avoid permanent damage of the evaluation board. • The internal power supply of the board can be selected between 3 Volts and 5 Volts DC by changing the position of the jumper J3. 4.2 Antenna connection • The SMA screw connector JP1 allows the connection of a 50-ohm antenna. The matching network is adjusted with CV1 capacitor on a prefect 50-ohm load. This will give maximum power up to 200mWatt to the connected antenna. 4.3 Connection to a microcontroller • All digital Inputs/Outputs of the MLX90121 device are available on the JP2 connector. This allows easy connection to a microcontroller. Following table is the description of JP2 connector. Pin number (connector JP2) 1 2 3 4 5 6 7 8 9 10 Name GND CK MODE DIN DOUT RTB DSYNC - Description Ground Serial Clock Input Configuration or Communication selected Input Data Input Data Output Reception or Transmission selection Input Synchronization Output for Dout Not connected Not connected Not connected Table 2: Connector JP2 390129012101 Rev 001 Page 6 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board Digital connector • All digital Inputs/Outputs of MLX90121 device are also available on the connector J2 and can be used to connect digital probes of an oscilloscope. 4.4 Analogue outputs • Some analogue outputs are foreseen on the evaluation board as test pins referenced from TP1 to TP8. These test pins can be used to measure analogue information. The following table describes all test pins available on the evaluation board. Test pins number TP1 TP2 TP3,TP6 TP8 Name VDD Ant GND CLK Description Supply Voltage Antenna Ground Output XBUF of MLX90121 device Table 3: Test pins 390129012101 Rev 001 Page 7 of 8 Evaluation Board Dec-2004 EVB90121 MLX90121 Evaluation Board 5 Disclaimer Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical lifesupport or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering of technical or other services. © 2004 Melexis NV. All rights reserved. For the latest version of this document, go to our website at www.melexis.com Or for additional information contact Melexis Direct: Europe and Japan: All other locations: Phone: +32 1367 0495 E-mail: [email protected] Phone: +1 603 223 2362 E-mail: [email protected] ISO/TS 16949 and ISO14001 Certified 390129012101 Rev 001 Page 8 of 8 Evaluation Board Dec-2004