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U3280M Datasheet(PDF) 5 Page - ATMEL Corporation |
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U3280M Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 21 page 5 4688D–RFID–03/07 U3280M 3.2.1 Digital Input to Control the Damping Stage (MOD) MOD = 0: coil not damped MOD = 1: coil damped V CMS = VCID: modulation voltage stroke at coil inputs Note: If the automatic power management is disabled, the internal front-end V DD is limited at VDDC. In this case the value V DDC must be used in the above formula. 3.3 Field Clock The field clock extractor of the interface makes the field clock available for the microcontroller. It can be used to supply timer inputs to synchronize modulation and demodulation with the field clock. 3.4 Gap Detect The transponder interface can also receive data. The base station modulates the data with short gaps in the field. The gap-detection circuit detects these gaps in the magnetic field and outputs the NGAP/field signal at the NGAP pin. A high level indicates that a field is applied at the coil and a low level indicates a gap or that the field is off. The microcontroller must demodulate the incoming data stream at one of its inputs. V coil-peak V DD 2V CMS V CU = + × = V coil-peak V DD 2 × V CD == |
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