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
Freight identification systems
Smart labels and write systems
Access control systems
Evaluation Board EVB90121
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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Evaluation Board
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EVB90121
MLX90121 Evaluation Board
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 D
IGITAL CONNECTOR
.................................................................................................................. 7
4.5 A
NALOGUE OUTPUTS
.................................................................................................................. 7
5 DISCLAIMER.................................................................................................................... 8
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L1
5 VOLTS
3 VOLTS
U2
XC6201 ( SOT89 )
3
2
1
IN
GND
D1
10uF/tantale
D2
Supply JUMPER
C3
OUT
1
J3
R1
7K5
R2
4K7
VK200
Vdd
1
TP1
GND
1
Ant
Antenna
VCC
JP1
1
TP2
1
L2
L3
TP3
C5
10nF
U3
1
VDD1
RX
VSS3
NC
VDD3
DSYNC
CK
MODE
DIN
VDD2
DOUT
C12
100nF
11
R8 1K
12
VCC
13
R7 1K
14
R6 1K
15
R5 1K
JP2
16
R10 1K
17
18
TEST ANA
TP4
1
19
Gnd
1
TX
MOD
VSS1
XOUT
XIN
VSS2
XBUF
NC
RTB
2
R4 10R
4
5
6
7
8
9
10
3
20
100nF
TP6
MLX 90121
C9
R3
4k7
4.7uH
5.6uH
1
2
Gnd
CV1
5-50pF
C4
33pF
VCC
C6
+
10uF/Tantale
C8
The schematic if the MLX90121 evaluation board is shown in figure 1.
TP8
Figure 1: Schematic of the evaluation board EVB90121
Clk
1
Page 3 of 8
10
8
6
4
2
9
7
5
3
1
100nF
L4
1.2uH
C7
47pF
2
390129012101
Rev. 002
VCC
3
C1
10uF/tantale
C2
10uF/tantale
J2
GND
CK
MODE
DIN
DOUT
RTB
DSYNC
J1
1 Schematic
JACK
3
2
1
2
U1
XC62FP ( SOT-89 )
IN
OUT
3
Y1
13.56MHZ
C10
22pF
C11
22pF
1
2
3
4
5
6
7
M icrocontroller
T est points
DIGIT AL
R9
1K
MLX90121 Evaluation Board
EVB90121
Evaluation Board
Jan/07
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
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Evaluation Board
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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,
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 kΩ
4,7 kΩ
4,7 kΩ
10
Ω
1 kΩ
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
μH
5,6
μH
1,2
μH
XC62FP
XC6201
MLX90121
Crystal
Description
Tuned capacitor used to adjust the matching network to 50-ohm
Decoupling capacitors, Tantalum type
Red LEDs
Connection to a 50 ohms antenna
Connection to a microcontroller
Power supply connection
Noise suppressor choke
Through hole RF chokes type B78108S from EPCOS
Through hole RF chokes type B78108S from EPCOS
Through hole RF chokes type B78108S from EPCOS
+5Volts regulator, package SOT23
+3Volts regulator, package SOT23
MLX90121CA device, package SSO20
Crystal oscillator
Table 1: Components
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Evaluation Board
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