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PCINT13 Datasheet(PDF) 197 Page - ATMEL Corporation |
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PCINT13 Datasheet(HTML) 197 Page - ATMEL Corporation |
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197 / 294 page  197 9219A–RFID–01/11 Atmel ATA5505 [Preliminary] 16.8 Driver (DRV) The driver supplies the antenna coil with the appropriate energy. The circuit consists of two independent output stages. These output stages can be operated in two different modes. In common mode, the outputs of the stages are in phase; in this mode the outputs can be inter- connected to achieve high-current output capability. The output voltages are in anti-phase when using the differential mode; the antenna coil is thus driven with a higher voltage. For a specific magnetic field, the antenna coil impedance is higher for the differential mode. Because higher coil impedance results in better system sensitivity, the differential mode should be given preference. The CFE input is intended for writing data to a read/write or a crypto transponder. This is done by interrupting the RF field with short gaps. The various functions are controlled by the MS and CFE inputs (see Table 16-3 on page 198). The equivalent circuit of the driver is shown in Fig- ure 16-1 on page 191. Figure 16-10. Equivalent Circuit of Pin MS Figure 16-11. Equivalent Circuit of Pin CFE MS 30µA CFE 30 µA |
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