Readers - RFID: Fundamentals and Applications in Contactless Smart Cards and Identification - page 312

DVS V S V Batt Standby

VEXT

Internal supply

9 V

25 kW

12 kW

6 V 6 V 18 V

PS

COILx

DRV

11413

DGND

Figure 11.15 Driver circuit in the reader IC UU2270B (reproduced by permission of TEMIC
Semiconductor GmbH, Heilbronn)

5 V

110 kW

5 V

VEXTVS VDD

VBatt
DVS

U2270B M44C260

47 nF 22 mF

RF
MS
CFE
OE
Standby
Output
Gain

680 pF

BP00
BP01
BP02

Input osc IN

3 2 kHz

4.7 kW BP03

BP10

osc OUT

1N4148

COIL2

470 kW

Micro
controller

1.2 nF

1.5 nF Read/write

circuit

100 nF

1.35 mH R

C31 COIL1

DGND GND

VSS

e5530
Transponder
TK5530

125 kHz

12635

Figure 11.16 Complete example application for the low cost reader IC U2270B (reproduced
by permission of TEMIC Semiconductor GmbH, Heilbronn)