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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2946 датащи(PDF) 10 Page - STMicroelectronics |
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AN2946 датащи(HTML) 10 Page - STMicroelectronics |
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10 / 38 page  Hardware design AN2946 10/38 Doc ID 15473 Rev 2 3 Hardware design 3.1 Circuit description 3.1.1 Power supply circuit The system auxiliary power supply can be built with a 12 V battery. In order to drive the power MOSFET and some analog ICs perfectly, a regulated 12 V is required. The 12 V power supply schematic is shown in Figure 6. Figure 6. 12 V power supply circuit The MCU requires a 3.3 V source which is obtained from the output of the linear regulator (U11), see Figure 7 . Figure 7. 3.3 V power supply circuit Since the 3.3 V supply is mainly for the MCU, a proper filter, which avoids high-frequency switching noise interference between the digital power supply (VDD) and analog power supply (VDDA), is strongly recommended. The filter circuit is shown in Figure 8. |
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