U2270B Просмотр технического описания (PDF) - Atmel Corporation

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U2270B

Read/Write Base Station

Atmel Corporation 

U2270B

4.3 Application 3

This application is comparable to “Application 2” but alters the operating frequency. This allows

higher antenna resonance tolerances and/or higher communication distances. This application

is preferred if the detecting microcontroller is close to the U2270B, as an additional microcontrol-

ler signal controls the adequate operating frequency.

Figure 4-3. Application Circuit 3

4×

1N4148

68 kΩ

75 kΩ

4.7 nF

+

5V

22 µF 47 nF

100 kΩ

1 nF

1.5 mH 82Ω

Antenna

1N4148

180 pF

100Ω

470 kΩ

43 kΩ

VS VEXT DVS VBatt

RF

MS

COIL2

CFE

U2270B

COIL1

Standby

CIN

1.5 nF CHP

Input

HIPASS

DGND

Output

OE

GND

BC846

4.7 kΩ

1.5 kΩ

VDD

Micro-

controller

VSS

GND

Note:

Application examples have not been examined for series production or reliability, and no worst

case scenarios have been developed. Customers who adapt any of these proposals must carry

out their own testing and be convinced that no negative consequences arise from the proposals.

13

4684E–RFID–02/08

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