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| 型号： | DEMO90121LR |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 5/19页 |
| 文件大小： | 0K |
| 描述： | KIT DEMO LONG RANGE READER |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 频率： | 13.56MHz |
| 适用于相关产品： | MLX90121 |
| 已供物品： | 阅读器电路板、天线板、3 个发射应答器卡、电源、RS232 缆线、软件和文档 |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
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
short!
Vdd
Det_in
BLM31AJ260SN1
5V
L2
C3
C4
C5
C6
Edge of the
board
C12
560NH
100NF
4.7UF/TANTAL
L3
100NF
4.7UF/TANTAL
ANTENNA1
100nF/50V
L4
L5
short!
C8
short!
GND_1W
GND_1W
Close to
680NH
1
short! short!
MLX90121 pin 2
C9
GND_TX
GND_TX
2.2UH
3.3UH
33PF
CV1
C18
10NF
2
1
Q2
R3
10E
C10
5.5-50PF/200V
100PF/100V/NPO
IRFD110
short!
L7
short!
C13
L6
XXPF/200V
3
270NH
BLM31AJ260SN1
5V
GND_1W
GND_1W GND_1W
4
330PF
C14
GND_1W
D3
BAS16
R5
680
C15
220Pf
100NF
R6
27K
U2
MLX90121
Close to
GND_RX
C19
D4
GND_TX
GND_TX
GND_TX
MLX90121 pin 2
1
VDD1
RX
20
3
1
Det_in
short!
2
TX
VSS3
19
2.2NF
BAR18
TP1
GND
R10
Close to
MLX90121 pin 3
3
4
MOD
VSS1
NC
VDD3
18
17
RSSI
short!
GND_RX
R8
22K
C20
100PF
R9
1K5
Close to
ANTENNA
51
GND_TX
short!
5
XOUT
DSY NC
16
DSY NC
GND_RX
GND_RX
GND_1W
connector
GND_1W
R12
M1
PMBF170
3
R11
6.8
Y1
short!
6
7
XIN
VSS2
CK
MODE
15
14
CK
MODE
MSI
2
10K
1
1
2
C21
13.56MHZ
C22
R13
10M
GND_uC
8
9
XBUF
NC
DIN
VDD2
13
12
DIN
5V
GND_1W
GND_1W
22PF
22PF
RTB
10
RTB
DOUT
11
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
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