U2270B-FP 查看數據表（PDF） - Temic Semiconductors

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U2270B-FP

Read / Write Base Station IC

Temic Semiconductors 

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

distances. This application is preferred if the detecting

µC is close to the U2270B as an additional µC signal

controls the adequate operating frequency.

4x 1N4148

68 kW

75 kW

4.7 nF

100 kW

43 kW

VS VEXT DVS VBatt

1 nF

1.5 mH 82 W

Antenna

1N4148

180 pF

100 W

470 kW

RF

MS

COIL 2

CFE

U2270B

COIL 1

Standby

Input

CIN

HIPASS

Output

OE

1.5 nF

CHP

DGND GND

BC846

4.7 kW

1.5 kW

Figure 16.

22 mF

5V

47 nF

VDD

GND

Micro-

controller

VSS

12606

TELEFUNKEN Semiconductors

Rev. A3, 13-Dec-96

9 (13)

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