U2270B-MFP Atmel, U2270B-MFP Datasheet - Page 11
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U2270B-MFP
Manufacturer Part Number
U2270B-MFP
Description
IC RFID BASEREADER 125KHZ 16SOIC
Manufacturer
Atmel
Series
U2270Br
Datasheet
1.U2270B-MFPG3Y.pdf
(18 pages)
Specifications of U2270B-MFP
Rf Type
Read / Write
Frequency
125kHz
Features
Read/Write Base Station
Package / Case
16-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
U2270B-MFPG3Y
Manufacturer:
ATMEL
Quantity:
450
Part Number:
U2270B-MFPG3Y
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
U2270B-MFPY
Manufacturer:
MICROCHIP
Quantity:
1 200
Part Number:
U2270B-MFPY
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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
)
11