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参数资料
| 型号： | DEMO90121LR |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 7/19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
Figure 6: RS232 transceiver
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 120-
ohms (R27) is also available to correctly match the end of the RS485 cable (Jumper CON4).
L8
+5Vser
C36
100NF
BLM31AJ260SN1
C38
4.7UF/TANTAL
+5V
R27
CON4
1
2
U6
GND_Ser
GND_Ser
3 L11
120
1
RS485_TER
CON2
TX
485_DE
4
3
2
DI
DE
RE
A
B
RO
6
7
1
4
B82789
2
3
2
1
RS485
LMS485IM
RX485
GND_Ser
GND_Ser
GND_Ser
GND_Ser
Figure 7: RS485
8.5 Power supplies and LEDs
The DEMO90121LR is supplied through the connector CON6. 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.
D1
CON1
1
2
30BQ060 SMD
Or
2
1
POWER
F1
0451.500MRL
D2
1
Vpower
C7
Edge of the
board
D1 and F1
not
assembled
SMBJ22A
2
10UF/TANTAL/35V
in the same
time
U10
Vpower
1
VI
VO
3
12V
R7
C16
100NF
7812C
C17
100NF
7K5
1
D5
2
+5V
L9
U3
Vpower
1
VI
VO
3
BLM31AJ260SN1
5V
R14
C26
7805C
C27
7K5
C25
10UF/TANTAL
100NF
100NF
1
D6
2
Figure 8: Power supplies
390129012104
Rev 003
Page 7 of 19
User Manual
Dec. 2009
相关PDF资料 |
PDF描述 |
|---|---|
| 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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| DEMO908AP64 | 功能描述:开发板和工具包 - S08 / S12 MC68HC908AP64 DEMO BRD 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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| 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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