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MC33690DW 数据表(PDF) 5 Page - Motorola, Inc

部件名 MC33690DW
功能描述  Standalone Tag Reader Circuit
Download  24 Pages
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制造商  MOTOROLA [Motorola, Inc]
网页  http://www.freescale.com
标志 MOTOROLA - Motorola, Inc

MC33690DW 数据表(HTML) 5 Page - Motorola, Inc

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MOTOROLA SEMICONDUCTORS PRODUCTS
5
revision 4.8, 5 February 2002
© Motorola, Inc., 2002.
MC33690
DESCRIPTION
TAG READER MODULE
The Tag Reader module is dedicated for
automotive or industrial applications where
information has to be transmitted contactless.
The tag reader module is a write/read (challenge/
response)
controller
for
applications
which
demand high security level.
The tag reader module is connected to a serial
tuned LC circuit which generates a magnetic field
power supplying the tag.
The use of a synchronous sample & hold
technique
allows
communication
with
all
avalaible
tags
using
admittance
switching
producing absorption of the RF field.
Load amplitude or phase shift modulation can be
detected at high bit rates up to 8kHz.
125kHz
is
the
typical
operational
carrier
frequency of the tag reader module with a 8MHz
clock.
Figure 2 : Tag Reader block diagram
D
C
Q
+
-
1/32 counter
1/2
RD
CEXT
AGND
Buffer
VDD
500ns
S/H
Buffer
Comparator
100K
8MHz
Clock 8MHz
Data out
Interface
125kHz
TD2
11.25° , 22.5° , 33.75° , 45° , 56.25° , 67.5° , 78.75° , 90°
AM Data
4MHz
125kHz
LVR
Shutdown
TD1
10nF
+ 0°, -11.25°, -22.5°, -33.75°, -45°, -56.25°, -67.5°, -78.75°
CA
LA
R1
R2
CEXT
RA
VDD
+
-
Setup & Preload
Self synchronous
sample & hold
500
µA
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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