U2270B-MFPG3Y Atmel, U2270B-MFPG3Y Datasheet - Page 11

• Manufacturer Part Number: U2270B-MFPG3Y
• Description: IC BASEREADER RFID 125KHZ 16SOIC
• Manufacturer: Atmel
• Series: U2270Br

Specifications of U2270B-MFPG3Y

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: Read/Write Base Station
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Pin Count: 16
• Screening Level: Industrial
• Package Type: SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.1
4684E–RFID–02/08
Application 1
The application of the U2270B includes the two capacitors C
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.
Table 4-2.
The following applications are typical examples. The values of C
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
Application using few external components. This application is for intense magnetic coupling
only.
Figure 4-1.
5V
470 k
Data Rate f = 125 kHz
f / 64 = 1.95 Kbits/s
f / 32 = 3.9 Kbits/s
47 nF
Recommended Capacitor Values
Application Circuit 1
1.5 nF
+
1N4148
47 µF
R
1.2 nF
C
IN
1.35 mH
Input Capacitor (C
10 cm.
V
DV
INPUT
COIL1
COIL2
680 pF
1.2 nF
Batt
S
DGND
U2270B
V
EXT
GND
IN
STANDBY
OUTPUT
)
HIPASS
V
S
CFE
110 k
MS
OE
RF
IN
and C
Decoupling Capacitor (C
C
IN
HP
and C
HP
whose values are lin-
100 nF
220 nF
HP
correspond to the
controller
Micro-
U2270B
V
V
DD
SS
HP
)
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