U2270B
| Model | U2270B |
| Description | Read / Write Base Station IC |
| PDF file | Total 13 pages (File size: 148K) |
| Chip Manufacturer | TEMIC |
U2270B
Application 3
This application is comparable to application 2 but alters
the operating frequency. This permits higher antenna
resonance tolerances and/or higher communication
4x 1N4148
68 k
W
22
m
F
5V
47 nF
distances. This application is preferred if the detecting
µC
is close to the U2270B as an additional
µC
signal
controls the adequate operating frequency.
75 k
W
100 k
W
1 nF
4.7 nF
43 k
W
V
S
RF
COIL 2
V
EXT
DV
S
V
Batt
MS
CFE
V
DD
GND
1.5 mH
Antenna
82
W
U2270B
COIL 1
Input
HIPASS
1.5 nF
4.7 k
W
1.5 k
W
C
HP
DGND
GND
Standby
Output
OE
Micro-
controller
1N4148
180 pF
100
W
BC846
470 k
W
C
IN
V
SS
12606
Figure 16.
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96
9 (13)
