User Manual
UM2042 Hardware
DocID029132 Rev 2 13/25
Figure 7. Antenna and matching network schematics
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1
2
2
3
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D D
C C
B B
A A
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31.05.2017 10:09:36
Antenna.SchDoc
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A4
ST25R3911B-DISCO
MDG NFC & Reader Competence Center
TRIM1_0
TRIM1_1
TRIM1_2
TRIM1_3
TRIM2_0
TRIM2_1
TRIM2_2
TRIM2_3
RFO1
RFO2
GND
GND
TRIM1
TRIM2
GND
TRIM1TRIM2
Trim Capacitor Banks
GND
RFI1
RFI2
RFO1
RFO2
TRIM1_0
TRIM1_1
TRIM1_2
TRIM1_3
TRIM2_0
TRIM2_1
TRIM2_2
TRIM2_3
Antenna_Con
Antenna_Con
Antenna Connection
1
2
J403
1
2
3
J402
C407
d.n.p.
C404
d.n.p.
NFC Forum matching
GND GND
RFI1
RFI2
RFI1
RFO1
RFO2
TRIM1_0
TRIM1_1
TRIM1_2
TRIM1_3
TRIM2_0
TRIM2_1
TRIM2_2
TRIM2_3
RFI2
C401
C_82p_0603
C412
C_82p_0603
C402
C_10p_0603
C411
C_10p_0603
C403
C_180p_0603
C410
C_180p_0603
C405
C_680p_0603
C409
C_680p_0603
L401
270n
L402
270n
C415
C_5p6_0402
C416
C_5p6_0402
C417
C_12p_0402
C418
C_12p_0402
C419
C_27p_0402
C420
C_27p_0402
C421
C_56p_0402
C422
C_56p_0402
C403_NFCF
C_120p_0603
C410_NFCF
C_120p_0603
C406
C_120p_0603
C408
C_120p_0603
Antenna Loop
R401
R402
R401_NFCF
R402_NFCF
J405
closed 0R
J404
closed 0R
J401
closed 0R
J406
closed 0R
J407
closed 0R
Antenna Circuit incl. EMI Filter and Matching