mc33690dw Freescale Semiconductor, Inc, mc33690dw Datasheet - Page 5

• Manufacturer Part Number: mc33690dw
• Description: Standalone Tag Reader Circuit Starc
• Manufacturer: Freescale Semiconductor, Inc

© Motorola, Inc., 2002.
DESCRIPTION
TAG READER MODULE
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.
L
C
R
A
A
The Tag Reader module is dedicated for
A
R
R
1
2
TD1
TD2
RD
-
+
VDD
Buffer
125kHz
+ 0°, -11.25°, -22.5°, -33.75°, -45°, -56.25°, -67.5°, -78.75°
11.25° , 22.5° , 33.75° , 45° , 56.25° , 67.5° , 78.75° , 90°
Freescale Semiconductor, Inc.
S/H
For More Information On This Product,
Figure 2 : Tag Reader block diagram
MOTOROLA SEMICONDUCTORS PRODUCTS
125kHz
500ns
1/32 counter
Self synchronous
sample & hold
Go to: www.freescale.com
+
-
Buffer
MC33690
AGND
4MHz
1/2
5
The use of a synchronous sample & hold
technique
avalaible tags
producing absorption of the RF field.
Load amplitude or phase shift modulation can be
detected at high bit rates up to 8kHz.
125kHz
frequency of the tag reader module with a 8MHz
clock.
C
100K
EXT
Ω
8MHz
Comparator
CEXT
VDD
+
is
-
Setup & Preload
10nF
allows
500
the
µA
using admittance
typical
communication
D
C
Q
operational
revision 4.8, 5 February 2002
Clock 8MHz
AM Data
Shutdown
Data out
Interface
LVR
switching
with
carrier
all