DEMO90121LR User Manual DownloadLink 5336

DEMO90121LR
RFID Long Range Demo User Manual
Features and Benefits
Application Examples
Asset tracking
Library’s book inventory control
Bicycle rental checkout
Output power of 1Watt
Supports ISO15693 international standard
RS232 communication
30$ BOM cost target
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.
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Important note: The device is for
demonstration purpose and has not been
tested for compliance with FCC, ETSI or
any other regulations.
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RFID Long Range Demo User Manual
Table of Contents
1 Scope.................................................................................................................................................1
2 Related Melexis product .................................................................................................................1
3 Introduction ......................................................................................................................................3
4 Box Content......................................................................................................................................3
5 Connections .....................................................................................................................................5
6 Function and use .............................................................................................................................5
7 Observations ....................................................................................................................................5
8 Hardware...........................................................................................................................................6
8.1 General ......................................................................................................................................... 6
8.2 MLX90121 Power Booster ............................................................................................................. 6
8.3 Progressive Field increase ........................................................................................................... 7
8.4 Serial interfaces............................................................................................................................ 7
8.5 Power supplies and LEDs............................................................................................................. 8
8.6 SPI and Serial memory.................................................................................................................. 9
8.7 External push button .................................................................................................................. 10
8.8 Microcontroller ATmega8 ........................................................................................................... 10
8.9 Ground planes connections........................................................................................................ 12
8.10 RFID Antenna............................................................................................................................ 12
9 Firmware .........................................................................................................................................14
9.1 Structure..................................................................................................................................... 14
9.2 Practical information................................................................................................................... 15
9.3 Instruction set ............................................................................................................................. 15
10 Conclusion....................................................................................................................................16
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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 component, 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.
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
Antenna connector
(SMA)
Figure 2: Antenna ANT3_0
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•
3 Transponder cards ISO15693
Figure 3: ISO15693 tag cards
•
1 Power supply block with adaptor
Figure 4: Power supply block
•
1 RS232 cable
Figure 5: RS232 cable
•
•
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, Schematics of the board (ORCAD 9.2 file), Layout of the
board (GERBER files), Bill of materials of the board
1 Box Content (on paper)
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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 RS232 cable from the computer to the three pin connector CON3. Finally,
connect the power supply block to the two pin connector CON1. 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 (CON1) 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 UT121 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 32cm 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.
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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
BLM31AJ260SN 1
C4
4.7U F/TANTAL
C5
L3
680NH
GND_1W
Close to
MLX90121 pin 2
3.3UH
1
short!
3
D3
BAS16
C14
330PF
R5
680
1
short!
C15
220Pf
100NF
U2
C18
GN D_TX
GND_TX
1
GND _TX
2
short!
3
1
1
GND _1W
GN D
R 10
51
M1
PMBF 170
R12
1
13. 56MHZ
1
10K
6
7
GND _1W
C22
22PF
GND _uC
R 13
10M
2
C21
22PF
8
2
2
Y1
9
RTB
1
MSI
short!
2
GND _1W
3
5
short!
GND_TX
R 11
6.8
2
Close to
ANTENNA
connector
4
Close to
MLX90121 pin 3
1
TP1
R6
27K
MLX90121
GN D_RX
Close to
MLX90121 pin 2
100PF/ 100V/N PO
5V
BLM31AJ260SN1
2
3
GN D_1W
L6
C 13
270NH
4
GND_1W
Det_in
L7
short!
1
2
GND _1W
R3
10E
Q2
IRF D110
C12
220PF/ 200V/N PO
4.7UF /TANTAL
GN D_TX
GN D_1W
10
VDD 1
TX
RX
VSS3
MOD
NC
VSS1
VDD 3
XOU T
D SY NC
XIN
VSS2
XBUF
CK
MOD E
D IN
NC
VDD 2
R TB
D OU T
C 19
D4
20
3
2. 2NF
19
18
RSSI
R8
22K
GN D_RX
17
short!
16
DSYN C
15
CK
14
MODE
13
DI N
GN D_RX
12
11
1
BAR 18
D et_in
2
2
10NF
C 10
XXPF/200V
GN D_TX
1
2.2U H
CV1
5. 5-50PF /200V
100N F
C9
33PF
C 20
100PF
R9
1K5
1
GN D_1W
short!
2
C8
1
L5
short!
2
L4
C6
1
short!
ANTENNA1
1
2
2
Edge of the
board
C3
100N F
2
L2
560NH
1
5V
1
short!
GND _R X
GN D_1W
5V
DOUT
C23
100NF
short!
GND _TX
CLK13M
C 24
220PF
GN D_uC
Figure 6: 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 by the resistor R11 to about 20% 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 reception point was moved after the inductor L5 because a
“notch” in the reception path was observed at the output ANTENNA1. Therefore, two capacitors C12 and C18
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have been placed to provide a divide-by-three to protect the diode of the detector from high voltages, and
also form a 68pF equivalent resistor which helps in the 50-ohm output matching.
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 7: 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 (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
14
U7A
100NF
GND_uC
1
RX232
3
14
74HC00P W 2
U7B
6
7
14
4
U7C
74HC00PW
5
U7D
74HC00PW 10
7
8
14
9
RX
12
RX485
74HC00P W 13
RS232_485
7
7
11
GND_uC
Figure 8: RS485/RS232 Rx signal switch
The RS232 allow for connecting the board to a serial COM port of a computer through the connector CON3
(T1OUT, R1IN and Ground). The voltage level is adapted using the MAX202 RS232 transceiver (U1).
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TX
U1
RX232
9
10
11
12
C40
1
3
4
5
2
6
100NF
C41
100NF
C43
C44
100NF
100NF
R2OUT VCC
GND
T2IN
T1IN
R1OUT
C+
C1C2+
C2V+
V-
T1OUT
R2IN
R1IN
T2OUT
16
15
+5Vser
C39
100NF
CON3
14
8
13
7
3
2
1
MAX202CSE
GND_Ser
RS232
+5Vser
GND_Ser
Figure 9: RS232
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
1
+5Vser
+5V
C 38
4.7UF/ TANTAL
CON 4
485_D E
DI
LMS485IM
GN D_Ser
RO
6
7
3 L11
1
4
2
2
1
2
RS485_TER
CON2
3
2
1
B82789
1
D 12
SMBJ 12CA
DE
RE
A
B
D 11
SMBJ 12CA
3
2
VCC
GND
4
R27
120
GND _Ser
5
U6
TX
8
GN D_Ser
1
2
C36
100NF
BLM31AJ260SN1
RS485
GN D_Ser
R X485
GND_Ser
GND _Ser
Figure 10: RS485
8.5 Power supplies and LEDs
The DEMO90121LR is supplied through the connector CON1. 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.
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D1
1
2
30BQ060 SMD
Or
CON 1
Vpower
F1
0451.500MRL
1
1
2
1
POW ER
Edge of the
board
D2
SMBJ 22A
C7
10U F /TAN TAL/35V
2
D1 and F1
not
assembled
in the same
time
2
U 10
7812C
12V
R7
7K5
C17
100N F
2
C 16
100NF
3
VO
2
VI
1
1
GND
Vpower
1
D5
2
+5V
L9
U3
VO
3
R 14
7K5
C 25
10U F /TAN TAL
C 27
100NF
2
1
2
7805C
C26
100N F
5V
BLM31AJ 260SN 1
1
VI
2
1
GND
Vpower
1
D6
2
Figure 11: Power supplies
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.
2
LEDgeneral
2
LEDserial
2
LEDmlx
1
1
R26
7K5
1
R 24
7K5
1
R23
7K5
1
1
D8
D9
2
D10
2
GND _uC
2
GN D_uC
GND_uC
Figure 12: 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.
U4
1
MOSI
5
SCK
6
5V
3
7
|CS
SO
2 MISO
SI
5V
SCK
|WP
|HOLD
VSS
EEPROM_CS
VCC
8
5V
C 29
100NF
4
FM25C160
GND_uC
GND_uC
Figure 13: Serial memory
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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.
1
5V
C 28
100NF
+
+
+
+
+
+
+
+
+
+
1
3
5
7
9
MOSI
CH_MOSI
1K
R16
1
2
RST
CH_RST
CH_SCK
CH_MISO
1K
R17
1
2
SCK
1K
R19
1
2
MISO
J1
2
4
6
8
10
R15
2
ISP
GN D_uC
100
Figure 14: Microcontroller programming
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.
R22
8K2
2
5V
3
2
5V
R25
8K2
1
1
1
D7
BAS16
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 15: 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.
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TX
RX
RST
RSTsoft
LEDserial
LEDmlx
MSI
D SYNC
D OUT
CK
1
2
3
4
5
6
7
8
R 18
100
short!
short!
24
23
22
21
20
19
18
17
C31
10NF
13.56MHZ
1
R21
10M
C34
22PF
C33
100NF
C 35
22PF
RSSI
R 20
8K2
R SSI_f il
short!
C32
100NF
GN D_ADC
GND _ADC
GND _uC
GN D_uC
9
10
11
12
13
14
15
16
2
short!
485_DE
EEPROM_CS
C 30
10N F
PD5
PD6
PD7
PB0
PB1
PB2
PB3
PB4
Y2
L10
PC1
PD3
PC0
PD4
ADC7
GN D
VCC A Tm ega 8 GND
GN D ATMEGA8-16AU AREF
ADC6
VCC
AVCC
PB6
PB5
PB7
2
PD2
PD1
PD0
PC6
PC5
PC4
PC3
PC2
CLK13M
1
U5
BLM31AJ260SN 1
5V
32
31
30
29
28
27
26
25
5V
GND_uC
GND_ADC
GND_ADC
SCK
MISO
MOSI
D IN
R TB
MODE
RS232_485
PFI
LEDgeneral
Figure 16: Microcontroller ATmega8
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 circuitng
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
PD1 ↔ TX
Transmission
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
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8.9 Ground plane connections
To reduce as much as possible the ground disturbances, ground connections have been split into several
ground planes: GND (power supply) GND_1W (power booster), GND_TX (RFID transmission), GND_DIG
(Digital), GND_Ser (Serial communication), GND_RX (RFID reception).
These ground planes are connected to the power supply as shown in the picture below.
short!
1
TP2
2
1OHM
1
SH9
2
1OHM
1
SH 1
2
1OHM
1
SH3
2
1OH M
1
SH5
2
1OHM
1
SH10
2
1OHM
1
SH 2
2
1OHM
1
SH4
2
1OH M
1
SH6
GND
G ND_1W
Close to
CON1
GND_1W
G ND_TX
G ND_1W
GND_uC
GND_RX
GND_Ser
Figure 17: Ground plane connections
8.10 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 18: 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.
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.
390129012104
Rev 001
Page 12 of 22
User Manual
Oct. 2007
DEMO90121LR
RFID Long Range Demo User Manual
The following serial and parallel capacitors have been calculated to provide a resistive 50-ohm load at
13.56MHz.
•
•
Cs = 270pF
Cp = 1nF
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 001
Page 13 of 22
User Manual
Oct. 2007
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
Error code interpretation
(ErrorCodes.c)
Inventory
(Iso15ac.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 001
Page 14 of 22
User Manual
Oct. 2007
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 R0R0 R1R1R2 R2R3R3 R4 R4R5 R5 R6R6 R7 R7R8 R8 R9R9 R10 R10 R11 R11 R12R12 ↵
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 001
Page 15 of 22
User Manual
Oct. 2007
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
Layout: See below
MLX90121 datasheet
ATMega8 datasheet
FW90121: Firmware description
13.56MHz RFID systems and antennas design guide
390129012104
Rev 001
Page 16 of 22
User Manual
Oct. 2007
2
1
G ND_ RX
GND _TX
GND _TX
1
G ND _TX
2
sh ort !
VD D1
RX
TX
VSS3
MOD
NC
2 .2N F
18
1
GND
2
R1 2
1
6
sh or t!
Y1
7
1
8
2
MSI
3
2
G ND _1W
G ND_ TX
R 11
6. 8
2
M1
PMBF1 70
5
sh ort !
1
R10
51
Cl ose t o
AN TEN NA
co nne ct or
4
C los e to
M LX9 01 21 pi n 3
R SSI
1 3. 56MHZ
GN D_u C
2
10 K
GND _1 W
R 13
1 0M
C 22
2 2PF
9
RTB
1
C 21
2 2PF
10
GND _1W
VSS1
VDD3
XOU T
DSYN C
CK
XIN
MO DE
VSS2
DI N
XBUF
NC
VDD2
R TB
D OUT
1
s hor t!
U10
Vpo wer
1
VI
C1 6
1 00 NF
VO
781 2C
3
1 2V
R7
7K5
C1 7
10 0NF
D et_ in
C 20
10 0PF
1
D5
R9
1 K5
2
16
D SYNC
15
CK
14
MODE
13
D IN
GND _R X
GND _RX
G ND_ 1W
+5 V
12
L9
5V
11
D OUT
U3
C2 3
Vpo wer
1
VI
1 00N F
sh ort !
VO
3
C LK13 M
GN D_u C
C26
10 0NF
R 14
7 K5
C 27
1 00N F
5V
BL M31 AJ2 60SN 1
78 05 C
C2 4
220 PF
2
G ND _TX
TAG Reader MLX90121
2
1 PFI
2
2
10 K
1
BAR18
R8
22 K
GN D_R X
17
1
D4
3
19
G1
Soft start PWM drive
C1 9
20
1
3
R4
S1
C2 5
10U F/TAN TAL
2
220 PF/10 0V/N PO
MLX90 121
C7
10 UF/TAN TAL/ 35 V
2
1
U2
Clo se to
MLX 90 121 p in 2
D1
5
FD C63 27 C
R6
2 7K
100 NF
G ND_ 1W
TP1
1
C 15
22 0Pf
C18
C11
1 00N F
R2
2K2
3
5V
2
C 14
G2
1
1
sho rt !
R5
6 80
D2
6
L6
BLM3 1AJ2 60 SN 1
3 30PF
2
3
D3
BAS16
S2
4
1
C 13
27 0NH
4
De t_in
Vd d
2
s hor t!
L7
sh ort !
3
100 PF/20 0V/N PO
GN D_TX
2
Q2
I RFD1 10
C12
GN D_ 1W
G ND_ TX
1
2
CV1
5 .5- 50 PF/ 20 0V
C10
XXPF/ 200 V
G ND_ 1W
G ND_ 1W
C9
3 3PF
R3
1 0E
GN D
C lo se to
M LX 901 21 pi n 2
1
D2
SMBJ2 2A
D 1 a nd F1
n ot
a sse mb led
i n t he sa me
t ime
2
GND _1W
1
1
2
10 NF
Vpowe r
04 51 .50 0MR L
POWER
E dge o f t he
b oar d
1
GND _1W
sh or t!
3 .3U H
2
C8
2
1
L5
sho rt !
2. 2U H
2
L4
Q1
4 .7U F/TAN TAL
1
ANTEN NA1
1
2
1
C6
100 NF
GN D
C5
L3
6 80 NH
2
C4
4. 7UF/ TANTAL
F1
1
C3
10 0N F
2
sh ort !
2
L2
56 0NH
E dge o f t he
b oar d
2
3 0BQ0 60 SMD
Or
CON 1
R1
4K7
2
1
1
C2
1 00 NF
11 Annexes
1
12V
C1
10 UF/ TANTAL
5V
11.1 Schematics
DEMO90121LR:
390129012104
Rev 001
D1
L1
Vd d
BLM31AJ 260 SN1
sh ort !
1
D6
C urr ent to o
s mal l
( 3V/ 7k5 =0. 4mA )
2
TX
RX
Supply
TX
U1
RX232
1 00N F
RX23 2
1 00 NF
RS232
1
SH 10
G ND_ TX
C los e t o p in 4 o f
M LX9 012 1
R S232 _4 85
C36
100 NF
+5 V
BLM3 1AJ2 60 SN1
C 38
4. 7UF/ TANTAL
3
2
PFI
8
DI
DE
RE
6
7
A
B
4
2
B82 78 9
1
RO
L EDmlx
1
SH 1
2
1 OH M
1
SH 2
2
1 OH M
1
SH 3
2
1 OH M
1
SH 4
2
1 OH M
1
SH 5
2
1 OH M
1
SH 6
R2 3
7K5
RS48 5
G ND_ uC
1
D8
GN D_Se r
R X4 85
Serial Interface
2
1 OH M
2
GND _Ser
RS485
GND _Ser
G ND_ uC
G ND_ Se r
2
L EDse rial
DSY NC
PFI
MSI
J6
1
J7
1
J8
1
SI
5V
R25
8K2
D7
BAS16
C2 8
10 0NF
2
RSTsof t
7
BUTTON 1
|W P
|H OLD
C29
100 NF
C 37
1 00N F
BUTTON2
4
3
C 45
1N F
4
3
2
4
6
8
10
+
+
+
+
+
+
+
+
+
+
1
3
5
7
9
1
1
1K
R1 6
2
R ST
CH _RST
CH _SCK
CH _MI SO
1
1K
R1 7
2
SCK
1
D9
G ND_ 1W
I SP
GND _uC
1K
R1 9
2
L EDge ner al
MISO
J9
BUTTO N_R STSOFT
10 0
GND _uC
Serial EEPROM
GN D_u C
uC reset circuit
G ND_ uC
1
SH 7
R2 6
7K5
ISP Interface for uC
G ND_ uC
J 10
2
1 OH M
BUTTON _R ESET
G ND_ uC
G ND_ RX
Cl ose to Ca pa Var
2
G ND_ uC
1
FM25C 16 0
MOSI
CH _MO SI
J1
2
RST
SCK
5V
2
3
2
R2 2
8K2
1
6
VC C
5
SCK
3
1
1
MO SI
5V
2 MISO
1
J5
SO
1
J4
1
|C S
R2 4
7K5
G ND_ uC
1
RTB
1
1
1
DO UT
U4
EEPRO M_C S
1
DI N
J3
VSS
MO DE
J2
1
4
G ND_ uC
1
R1 5
1
2
8
5V
CK
5V
2
5V
1
GND _u C
G ND_ AD C
S tar co nne cti on clo se
t o p in 5 o f A Tme ga8
D1 0
Soft reset circuit
2
G ND_ uC
User Manual
Oct. 2007
debug connector
LEDs
GND connections
Size
C AG E Co de
D WG NO
Re v
1. 0
A2
MELEXIS Tec hno logie s SA
W edn es day , Sep te mb er 12 , 20 07
Sca le
RD 4-9 01 21 V1. 0-L R: 13 .5 6MH z 1W Tag Rea de r
Sh eet
1
of
1
DEMO90121LR
GND _Ser
5
LEDg en era l
LMS4 85 IM
CO N2
3
2
1
D 12
S MBJ 12 C A
4
4 85 _DE
1
D 11
S MBJ 12 C A
TX
V CC
G ND
7
G ND_ uC
3 L 11
1
2
RS48 5_TER
2
2
CON 4
R2 7
12 0
GND _Ser G ND _Ser
2
RX48 5
13
RS485/RS232 RX Signal Switch
2
1 OH M
1
12
U6
RS23 2_ 485
1
SH 9
L8
+5Vs er
11
7 4HC 00 PW
2
1 OH M
G ND_ 1W
1
U7D
Clo se to
CON 1
6
7
G ND _ADC
G ND_ ADC
RS23 2
1
32
31
30
29
28
27
26
25
9
10
11
12
13
14
15
16
G ND_ Se r
G ND_ 1W
GND
3
2
1
GN D_Se r
74H C00 PW 5
8
s hor t!
TP2
CO N3
14
2
9
RX
SC K
MISO
MOSI
uC (ADC, protocol, memory)
C 39
100 NF
14
8
13
7
4
U 7C
C 32
10 0N F
7 4HC 00PW 1 0
GN D_u C
DIN
RTB
MOD E
+5 Vse r
+5 Vser
100 NF
14
7 4HC 00 PW
GND _ADC
G ND _ADC
GN D_ uC
C+
C1 T1 OUT
C2 +
R 2IN
C2 R 1IN
V+
T2 OUT
VMAX2 02 CSE
16
15
G ND_ uC
1
7
C3 5
22PF
GN D_u C
C 44
R2 OUT VCC
T2 IN
GND
T1 IN
R1 OUT
3
7
1
C 34
22 PF
C33
100 NF
C 43
1 00N F
U7A
R 20
8K2
R SSI _f il
s ho rt!
C 30
10 NF
C 31
10 NF
2
sho rt!
13 .56 MH Z
R21
10 M
1 00N F
+5V
U7 B
PD 5
PD 6
PD 7
PB0
PB1
PB2
PB3
PB4
Y2
PC1
PD 3
PC0
PD 4
G ND
ADC7
VC C A Tm e ga 8 GND
G ND ATMEGA8- 16 AU AREF
VC C
ADC6
PB6
AVCC
PB7
PB5
C42
R SSI
14
sho rt!
4 85 _DE
EEPRO M_ CS
14
R18
100
s ho rt!
L1 0
24
23
22
21
20
19
18
17
2
1
2
3
4
5
6
7
8
1
DOU T
CK
BL M3 1A J2 6 0SN 1
CL K1 3M
C 41
5V
PD 2
PD 1
PD 0
PC 6
PC 5
PC 4
PC 3
PC 2
U5
1
3
4
5
2
6
RFID Long Range Demo User Manual
Page 17 of 22
MSI
DSYN C
5V
9
10
11
12
C 40
1
RST
RSTsof t
LED ser ial
LED mlx
RFID ANTENNA:
390129012104
Rev 001
C V2
5-50pF
C8
1
2
C AP
C7
1
2
C AP
R s3 R
C6
1
2
C AP
R s2 R
C5
1
C2
C3
R s1 R
2
C AP
1
C1
1
J1
1
1
Signal
C4
2
1
Copper
antenna
C V1
5-50pF
C AP
2
C AP
2
C AP
2
2
C AP
C oax
GND
D ate:
D ocument Number
<Doc>
Wednesday , Nov ember 23, 2005 Sheet
Rev
2
1
of
1
User Manual
Oct. 2007
DEMO90121LR
13.56Mhz RFID_antenna
Size
A
RFID Long Range Demo User Manual
Page 18 of 22
Title
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
22
3
1
1
1
1
2
1
2
4
1
1
1
1
2
2
2
3
1
9
2
5
1
1
1
1
1
1
390129012104
Rev 001
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
C43,C44
C8,C30,C31
C19
C45
C9*
C10*
C12,C20
C13
C15, C18
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
L5
L7
M1*
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
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 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
3.3uH
0.27uH
PMBF170
Ground connection
EMI filter inductor
Matching coil
Matching coil
Matching coil
Matching coil
Matching coil
10% modulation transistor
Page 19 of 22
User Manual
Oct. 2007
DEMO90121LR
RFID Long Range Demo User Manual
1
1
1
1
1
2
1
1
5
1
1
1
1
1
3
2
3
1
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
FDC6327C
IRFD110
4K7
2K2
10E
10K
680
27K
7K5
22K
1K5
5,6
6,8
10M
1K
100
8K2
120
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
1
1
1
1
1
1
3
Reference
C1
C2
C3*,C4*
CV1*
C5
CV1
C6*,C7*,C8*
Rs1,Rs2,Rs3
Value
1nF
220pF
5-50pF
270pF
5-50pF
2.4-ohm
Description
Mica capacitor
Mica capacitor
Mica capacitor
Trimer capacitor
Mica capacitor
Trimer capacitor
Mica capacitor
Thick film resistor 1210
*These components are not mounted.
390129012104
Rev 001
Page 20 of 22
User Manual
Oct. 2007
DEMO90121LR
RFID Long Range Demo User Manual
11.3 Layout
DEMO90121LR:
TOP
BOTTOM
390129012104
Rev 001
Page 21 of 22
User Manual
Oct. 2007
DEMO90121LR
RFID Long Range Demo User Manual
RFID ANTENNA:
390129012104
Rev 001
Page 22 of 22
User Manual
Oct. 2007
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