參數(shù)資料
型號(hào)： CLRC632
廠商： NXP Semiconductors N.V.
英文描述： Multiple Protocol Contactless Reader IC
中文描述： 多協(xié)議非接觸式讀卡器IC
文件頁數(shù)： 140/163頁
文件大?。?/td> 948K
代理商： CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
140
Confidential
20.2 Circuit Description
The matching circuit consists of an EMC low pass filter (L0 and C0), a matching circuitry (C1 and C2), and a
receiving circuit (R1, R2, C3 and C4), and the antenna itself.
For more detailed information about designing and tuning an antenna please refer to the Application Note
’MIFARE
and I CODE MICORE reader IC family; Directly Matched Antenna Design’
and
‘MIFARE
(14443A) 13,56 MHz RFID Proximity Antennas’
.
20.2.1 EMC LOW PASS FILTER
The MIFARE
system operates at a frequency of 13.56 MHz. This frequency is generated by a quartz
oscillator to clock the CL RC632 and is also the basis for driving the antenna with the 13.56 MHz energy
carrier. This will not only cause emitted power at 13.56 MHz but will also emit power at higher harmonics.
The international EMC regulations define the amplitude of the emitted power in a broad frequency range.
Thus, an appropriate filtering of the output signal is necessary to fulfil these regulations.
A multi-layer board it is recommended to implement a low pass filter as shown in the circuit above. The low
pass filter consists of the components L0 and C0. The recommended values are given in the above
mentioned application notes.
Note: To achieve best performance all components shall have at least the quality of the recommended ones.
Note: The layout has a major influence on the overall performance of the filter.
20.2.2 ANTENNA MATCHING
Due to the impedance transformation of the given low pass filter, the antenna coil has to be matched to a
certain impedance. The matching elements C1 and C2 can be estimated and have to be fine tuned
depending on the design of the antenna coil.
The correct impedance matching is important to provide the optimum performance. The overall Quality factor
has to be considered to guarantee a proper ISO14443 communication scheme. Environmental influences
have to considered as well as common EMC design rules.
For details refer to the above mentioned application notes.
Note: Do not exceed the current limits I
TVDD
, otherwise the chip might be destroyed.
Note: The overall 13.56MHz RFID proximity antenna design with the CL RC632 chip is straight forward and
doesn’t require a special RF-know how. However, all relevant parameters have to be considered to
guarantee an overall optimum performance together with international EMC compliance.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CLRC63201T/0FE 制造商:NXP Semiconductors 功能描述:
CLRC63201T/0FE,112 功能描述:RFID應(yīng)答器 I.CODE HS READER RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel
CLRC63201T/0FE,118 制造商:NXP Semiconductors 功能描述:Interface Misc
CLRC63201T/0FE112 制造商:NXP Semiconductors 功能描述:CNTCLESS RC 5V ISO14443 + ISO15693
CLRC663 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Contactless reader IC
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