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AS3933 Datasheet(PDF) 56 Page - ams AG |
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AS3933 Datasheet(HTML) 56 Page - ams AG |
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56 / 64 page  ams Datasheet Page 55 [v1-08] 2015-Sep-02 Document Feedback AS3933 − Detailed Description Figure 64: Parallel Tuning Capacitance on the LF3P The Three channels can be tuned separately. The host system (MCU) has to connect the LC-oscillator to the antenna to measure the resonance frequency on the pin DAT. The host should measure the frequency on this pin and just changing register setting fine tune it to get it as close as possible to the nominal value of the carrier frequency. With the bits R16<2:0> it is possible to connect the LC-oscillator to the three different antennas. Channel Selection in Scanning Mode and ON/OFF Mode In case only 2 channels are active and one of the Low Power modes is enabled, then the channels 1 and 3 have to be active. If the chip works in ON-OFF mode and only one channel is active then the active channel has to be the channel 1. Both Low Power modes are not allowed to be enabled at the same time. R19 Capacitance on LF3P R19<0>=1 Adds 1pF to LF3P R19<1>=1 Adds 2pF to LF3P R19<2>=1 Adds 4pF to LF3P R19<3>=1 Adds 8pF to LF3P R19<4>=1 Adds 16pF to LF3P |
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