EVB90121
MLX90121 Evaluation Board
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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.
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Table of Contents
1 SCHEMATIC................................................................................................................................................................................ 3
2 PHYSICAL OUTLINE ................................................................................................................................................................... 4
3 COMPONENTS............................................................................................................................................................................ 5
4 GUIDELINES ............................................................................................................................................................................... 6
4.1
P
OWER SUPPLY
..................................................................................................................................... 6
4.2
A
NTENNA CONNECTION
........................................................................................................................... 6
4.3
C
ONNECTION TO A MICROCONTROLLER
.................................................................................................... 6
4.4
A
NALOGUE OUTPUTS
..............................................................................................................................7
5 DISCLAIMER............................................................................................................................................................................... 8
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1 Schematic
The schematic if the MLX90121 evaluation board is shown in figure 1.
Figure 1: Schematic of the evaluation board EVB90121
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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
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3 Components
The table below gives an overview of all components that composed the evaluation board EVB90121.
Reference Value Description
R1
7,5 k
R2 4,7 k
R3 4,7 k
R4 12
R5,R6,R7,R8,R9,R10 1 k
CV1 5-50 pF Tuned capacitor used to adjust the matching network to 50-ohm.
C1,C2,C3,C6 10uF Decoupling capacitors, Tantale type
C4 33 pF
C5 10 nF
C7 47 pF
C8,C9,C12 100 nF
C10,C11 22 pF
D1,D2 ??? Red Leds
JP1 SMA connector Connection to a 50 ohms antenna
JP2 DIL10 connector Connection to a microcontroller
J1 Jack connector Power supply connection
J2 Debug connector
L1 VK200 Noise suppressor choke
L2 4,7
H
L3 5,6
H
L4 1,2
H
U1 XC62FP +5Volts regulator, package SOT23
U2 XC6201 +3Volts regulator, package SOT23
U3 MLX90121 MLX90121CA device, package SSO20
Y1 Crystal Crystal oscillator
Table 1: Components
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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) Name Description
1
GND
Ground
2 CK Serial Clock Input
3 MODE Configuration or Communication selected Input
4 DIN Data Input
5 DOUT Data Output
6 RTB Reception or Transmission selection Input
7 DSYNC Synchronization Output for Dout
8 - Not connected
9 - Not connected
10 - Not connected
Table 2: Connector JP2
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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 Name Description
VDD
Supply Voltage
TP2 Ant Antenna
TP3,TP6 GND Ground
TP8 CLK Output XBUF of MLX90121 device
Table 3: Test pins
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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 life-
support 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 Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com E-mail: sales_usa@melexis.com
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