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参数资料
| 型号： | DEMO90121LR |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 10/19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
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 circuiting
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
Reset
PD2
?
DSYNC
Data Synchronization
PC6
?
RST
Reset
PD3
?
DOUT
Data OUT
PD4
?
CK
Clock
Serial communication RS232/RS485
PD5
PD6
PD7
?
?
?
DIN
RTB
MODE
Data IN
Receive/Transmit
Config/Comm
PB2
PC1
PD0
?
?
?
RS232_485 RS232/485 selection
485_DE RS485 driver enable
RX Reception
LEDs
PD1
?
TX Transmission
PB0
?
LEDgeneral
Not used
External FRAM
PC3
?
LEDmlx
RFID communication
PC0
?
EEPROM_CS
Serial FRAM selection
PC4
?
LEDserial
Serial communication
PFI block
SPI
PB1
?
PFI
Progressive field incr.
PB3
?
MOSI
Maste Out Slave In
PB4
PB5
?
?
MISO
SCLK
Master In Slave Out
Serial Clock
Table 1: Connections to microcontroller ATmega8
8.9 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 14: 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.
390129012104
Rev 003
Page 10 of 19
User Manual
Dec. 2009
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PDF描述 |
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| DEMOFLEXISJMSD | CARD READER M9S08JM60 |
| DF3GD | LIGHT BAR 565NM GREEN 6.8X19.9MM |
| DF3ID | LIGHT BAR 627NM HERED 6.8X19.9MM |
| DF3SGD | LIGHT BAR 565NM GREEN 6.8X19.9MM |
| DF3SRD | LIGHT BAR 660NM RED 6.8X19.9MM |
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| DEMO908AP64QSG | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DEMO908AP64 Quick Start Guide |
| DEMO908GZ60 | 功能描述:开发板和工具包 - S08 / S12 908GZ60 DEMO BOARD RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor |
| DEMO908GZ60E | 功能描述:开发板和工具包 - S08 / S12 908GZ60 DEMO BOARD RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor |
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