U2270B Просмотр технического описания (PDF) - Atmel Corporation

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U2270B

Read/Write Base Station

Atmel Corporation 

4.2 Application 2

Basic application using diode feedback. This application allows higher communication distances

than .“Application 1”

Figure 4-2. Application Circuit 2

BC639

4×

1N4148

75 kΩ

68 kΩ

4.7 nF

+

22 µF

100 kΩ

43 kΩ

1.2 nF

1.35 mH 82Ω

Antenna

1N4148

470 kΩ

1.5 nF

CIN

CHP

VS VEXT DVS VBatt

RF

MS

COIL2

CFE

U2270B

COIL1

Standby

Input

Output

HIPASS

OE

DGND GND

360Ω

+

22 µF

+

22 µF

VDD

12V

GND

Micro-

controller

I/O

VSS

12 U2270B

4684E–RFID–02/08

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