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AS3933 Datasheet(PDF) 55 Page - ams AG |
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AS3933 Datasheet(HTML) 55 Page - ams AG |
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55 / 64 page  Page 54 ams Datasheet Document Feedback [v1-08] 2015-Sep-02 AS3933 − Detailed Description Each of the three antennas can be tuned with the internal capacitor banks. The capacitor can be connected or disconnected (adding or subtracting parallel capacitance to the external resonator) through registers R17<4:0>, R18<4:0> and R19<4:0>. Figure 62: Parallel Tuning Capacitance on the LF1P Figure 63: Parallel Tuning Capacitance on the LF2P R17 Capacitance on LF1P R17<0>=1 Adds 1pF to LF1P R17<1>=1 Adds 2pF to LF1P R17<2>=1 Adds 4pF to LF1P R17<3>=1 Adds 8pF to LF1P R17<4>=1 Adds 16pF to LF1P R18 Capacitance on LF2P R18<0>=1 Adds 1pF to LF2P R18<1>=1 Adds 2pF to LF2P R18<2>=1 Adds 4pF to LF2P R18<3>=1 Adds 8pF to LF2P R18<4>=1 Adds 16pF to LF2P |
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