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参数资料
| 型号： | DEMO90121LR |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 6/19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
8.3 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 ).
12V
C1
10UF/TANTAL
C2
100NF
Q1
R1
4K7
2
S2
R2
Vdd
C11
4
6
D2
D1
G2
3
2K2
R4
100NF
5
S1
G1
1
2
1 PFI
10K
FDC6327C
Figure 4: 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 (CON5 or 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
U7A
1
GND_uC
100NF
RX232
3
74HC00PW 2
U7B
4
U7C
9
6
74HC00PW 5
RX
8
74HC00PW 10
U7D
12
RX485
11
74HC00PW 13
RS232_485
GND_uC
Figure 5: RS485/RS232 Rx signal switch
The RS232 allow for connecting the board to a serial COM port of a computer through the serial connector
RS232. The voltage level is adapted using the MAX202 RS232 transceiver (U1).
TX
U1
RX232
C40
9
10
11
12
R2OUT VCC
T2IN GND
T1IN
R1OUT
16
15
+5Vser
C39
100NF
100NF
C41
100NF
1
3
4
5
2
6
C+
C1-
C2+
C2-
V+
V-
T1OUT
R2IN
R1IN
T2OUT
14
8
13
7
CON3
3
2
1
C43
C44
MAX202CSE
GND_Ser
RS232
1uF
100NF
+5Vser
GND_Ser
390129012104
Rev 003
Page 6 of 19
User Manual
Dec. 2009
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