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U227B データシート(PDF) 4 Page - ATMEL Corporation |
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U227B データシート(HTML) 4 Page - ATMEL Corporation |
4 / 18 page 4 4684E–RFID–02/08 U2270B 3. Functional Description 3.1 Power Supply (PS) Figure 3-1. Equivalent Circuit of Power Supply and Antenna Driver The U2270B can be operated with one external supply voltage or with two externally-stabilized supply voltages for an extended driver output voltage or from the 12V battery voltage of a vehi- cle. The 12V supply capability is achieved via the on-chip power supply (see Figure 3-1). The power supply provides two different output voltages, V S and VEXT. V S is the internal power supply voltage for everything except for the driver circuit. Pin VS is used to connect a block capacitor. V S can be switched off by the STANDBY pin. In standby mode, the chip’s power consumption is very low. V EXT is the supply voltage of the antenna’s pre-driver. This voltage can also be used to operate external circuits, such as a microcontroller. In conjunc- tion with an external NPN transistor, it also establishes the supply voltage of the antenna coil driver, DVS. V Batt Standby DGND V S 6V PS DRV 18V 12 k Ω 6V 9V Internal supply COILx V EXT 25 k Ω DV S |
同様の部品番号 - U227B |
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同様の説明 - U227B |
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