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U227B Arkusz danych(PDF) 5 Page - ATMEL Corporation |
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U227B Arkusz danych(HTML) 5 Page - ATMEL Corporation |
5 / 18 page 5 4684E–RFID–02/08 U2270B 3.2 Operation Modes to Power the U2270B The following section explains the three different operation modes to power the U2270B. 3.2.1 One-rail Operation All internal circuits are operated from one 5V power rail (see Figure 3-2). In this case, V S, VEXT and D VS serve as inputs. VBatt is not used but should also be connected to that supply rail. Figure 3-2. One-rail Operation Supply 3.2.2 Two-rail Operation In this application, the driver voltage, D VS, and the pre-driver supply, VEXT, are operated at a higher voltage than the rest of the circuitry to obtain a higher driver-output swing and thus a higher magnetic field (see Figure 3-3). V S is connected to a 5V supply, whereas the driver volt- ages can be as high as 8V. This operation mode is intended to be used in situations where an extended communication distance is required. Figure 3-3. Two-rail Operation Supply 3.2.3 Battery-voltage Operation Using this operation mode, V S and VEXT are generated by the internal power supply (see Figure 3-4 on page 6). For this mode, an external voltage regulator is not needed. The IC can be switched off via the STANDBY pin. V EXT supplies the base of an external NPN transistor and external circuits, like a microcontroller (even in standby mode). Pin V EXT and VBatt are overvoltage protected via internal Zener diodes (see Figure 3-1 on page 4).The maximum current into the pins is determined by the maximum power dissipation and the maximum junction temperature of the IC. V Batt Standby +5V (stabilized) + V S V EXT DV S + V Batt Standby 5V (stabilized) + V S V EXT DV S 7V to 8V (stabilized) |
Podobny numer części - U227B |
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Podobny opis - U227B |
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