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U227B Arkusz danych(PDF) 11 Page - ATMEL Corporation

Numer części U227B
Szczegółowy opis  Carrier Frequency fosc 100 kHz to 150 kHz
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Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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11
4684E–RFID–02/08
U2270B
The application of the U2270B includes the two capacitors C
IN and CHP whose values are lin-
early dependent on the transponder’s data rate. The following table gives the appropriate values
for the most common data rates. The values are valid for Manchester and bi-phase code.
The following applications are typical examples. The values of C
IN and CHP correspond to the
transponder’s data rate only. The arrangement to fit the magnetic-coupling situation is also inde-
pendent of other design issues except for one constellation. This constellation, consisting of
diode feedback plus fine frequency tuning together with the two-rail power supply, should be
used if the transmission distance is d
≈ 10 cm.
4.1
Application 1
Application using few external components. This application is for intense magnetic coupling
only.
Figure 4-1.
Application Circuit 1
Table 4-2.
Recommended Capacitor Values
Data Rate f = 125 kHz
Input Capacitor (CIN)
Decoupling Capacitor (CHP)
f / 32 = 3.9 Kbits/s
680 pF
100 nF
f / 64 = 1.95 Kbits/s
1.2 nF
220 nF
+
1.5 nF
1.2 nF
47 nF
47 µF
RF
MS
OE
STANDBY
HIPASS
OUTPUT
CFE
INPUT
COIL1
COIL2
1.35 mH
R
GND
5V
Micro-
controller
DGND
1N4148
470 k
110 k
DV
S
V
Batt
V
DD
V
EXT
V
SS
C
HP
C
IN
V
S
U2270B


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