没有合适的资源?快使用搜索试试~ 我知道了~
首页基于HITAG读写芯片HTRC110的读写设备设计
资源详情
资源评论
资源推荐
AN98080
Read/write devices based on the HITAG read/write IC
HTRC110
Rev. 3.0 — 23 March 2010
035530
Application note
PUBLIC
Document information
Info Content
Keywords Basestation, Reader, HTRC110, HITAG, Antenna Design, RF-Identification
Abstract Designing read/write device (RWD) units for industrial RF-Identification
applications is strongly facilitated by the NXP Semiconductors HITAG
Reader Chip HTRC110. All needed function blocks, like the antenna
driver, modulator demodulator and antenna diagnosis unit, are integrated
in the HTRC110. Therefore only a minimum number of additional passive
components are required for a complete RWD.
This Application Note describes how to design an industrial
RF-Identification system with the HTRC110. The major focus is
dimensioning of the antenna, all other external components including
clock and power supply, as well as the demodulation principle and its
implementation.
All presented numeric parameters base on the HTRC110 HITAG Reader
Chip data sheet [1].
AN98080_30 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Application note
PUBLIC
Rev. 3.0 — 23 March 2010
035530 2 of 58
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors
AN98080
Read/write devices based on the HITAG read/write IC HTRC110
Revision history
Rev Date Description
3.0 20100323
• The format of this application note has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
• Legal texts have been adapted to the new company name where appropriate.
1.2 September 1998
AN98080_30 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Application note
PUBLIC
Rev. 3.0 — 23 March 2010
035530 3 of 58
NXP Semiconductors
AN98080
Read/write devices based on the HITAG read/write IC HTRC110
1. Introduction
With the HITAG Reader Chip, HTRC110 a highly integrated RWD with a powerful circuit
implementation is available.
The HTRC110 is ideally suited to design an advanced RWD for industrial applications.
The device incorporates all necessary functions to facilitate reading and writing to an
external transponder.
It makes use of a unique demodulation technique that extends the system operation
range compared with first generation envelope detection based systems.
The HTRC110 is optimized to operate with the NXP Semiconductors transponder family
HITAG, HITAG 2, HITAG S and HITAG μ.
Device characteristics, like receiver gain and bandwidth, or transmit timing, are widely
programmable, in order to match the RWD to the applied transponder.
For the purpose of system diagnostics, the HTRC110 provides antenna failure detection.
Designed for low power consumption employing CMOS technology, the device supports
IDLE and POWER-DOWN modes.
Requiring only few external components and coming in the compact SO14 plastic
package the HTRC110 guarantees a minimized overall size.
AN98080_30 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Application note
PUBLIC
Rev. 3.0 — 23 March 2010
035530 4 of 58
NXP Semiconductors
AN98080
Read/write devices based on the HITAG read/write IC HTRC110
Fig 1. HTRC110 block diagram
XTAL1
XTAL2
DIN
DOUT
SCLK
QGND
CEXT
VSS
VDD
antenna drivers
demodulator
phase
measurement
modulator
bandpass filter
amplifier
dynamic control
digitizer
unit
control
control registers
oscillator
programmable
divider
interface
serial
digital
glitch
filters
MODE
TX2
RX
TX1
EMI
filter
AN98080_30 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Application note
PUBLIC
Rev. 3.0 — 23 March 2010
035530 5 of 58
NXP Semiconductors
AN98080
Read/write devices based on the HITAG read/write IC HTRC110
2. Power supply
The supply current of the HTRC110 consists of two components:
• 10 mA
DC
maximum for the supply of the IC with its internal function blocks
• the current driven into the antenna resonance circuit
As the antenna current is nearly sine shaped, the average DC-current component can be
calculated by:
(1)
where Î
ant
describes the antenna current amplitude. With Î
ant
= 200 mA the maximum
overall supply current results in 10 mA + 2/π * 200 mA = 137 mA. Using the burst mode,
where Î
ant
= 400 mA is allowed for t
on
< 400 ms at a pulse/pause ratio of 1:4, I
ant
DC
=
265 mA respectively.
When switching on the power supply, the HTRC110 performs an internal power-on reset,
where all internal registers (e.g. the configuration pages) are reset to their initial settings
(see Ref. 1
).
2.1 Supply regulation and ripple criteria
Any supply voltage fluctuations or ripple are transferred into antenna current fluctuations
by the antenna driver transistors. This is equal to a current modulation that results in a
voltage modulation at the antenna tap point. There is no possibility for the demodulator to
distinguish this modulation from the transponder modulation. Especially in the passband
of the demodulator filters, the system is very sensitive against supply hum and ripple.
Therefore, supply fluctuations cause strong signal disturbances at the demodulator
output. Because of this, selecting a proper stable supply regulator is essential for good
system performance.
2.2 Bypass capacitors
The power supply shall be bypassed/decoupled via a 10 μF or larger capacitor in parallel
to a 100 nF capacitor. It is recommended to choose SMD-components being placed close
to the VDD- and VSS-pins (Pin-Nr. 1 and 3) in the immediate vicinity of the HTRC110.
The bypass capacitors are extraordinary important because of the following reason: When
the field is switched off during the WRITE-pulses, the energy stored in the resonant
circuitry results in a current driven into the HTRC110 after switching off the drivers. By
this, the current direction at the HTRC110 VDD pin is inverted from sink to source. Normal
voltage regulators are only capable to act as source, not as sink. By this, the whole
system supply voltage level would be increased even by some volts, if not buffer capacitor
of sufficient size is applied. The regulator tries to compensate this effect and stops
sourcing current. After the increased voltage is dissipated, normally the recovery time of
the regulator leads to an undervoltage for a period of time. This undervoltage can also be
in the range of some volts if the buffer capacitors are omitted.
I
ant
DC
2
π
---
I
ˆ
ant
=
剩余57页未读,继续阅读
jackson09271
- 粉丝: 0
- 资源: 1
上传资源 快速赚钱
- 我的内容管理 收起
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
会员权益专享
最新资源
- zigbee-cluster-library-specification
- JSBSim Reference Manual
- c++校园超市商品信息管理系统课程设计说明书(含源代码) (2).pdf
- 建筑供配电系统相关课件.pptx
- 企业管理规章制度及管理模式.doc
- vb打开摄像头.doc
- 云计算-可信计算中认证协议改进方案.pdf
- [详细完整版]单片机编程4.ppt
- c语言常用算法.pdf
- c++经典程序代码大全.pdf
- 单片机数字时钟资料.doc
- 11项目管理前沿1.0.pptx
- 基于ssm的“魅力”繁峙宣传网站的设计与实现论文.doc
- 智慧交通综合解决方案.pptx
- 建筑防潮设计-PowerPointPresentati.pptx
- SPC统计过程控制程序.pptx
资源上传下载、课程学习等过程中有任何疑问或建议,欢迎提出宝贵意见哦~我们会及时处理!
点击此处反馈
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功
评论3