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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD360 датащи(PDF) 188 Page - Microchip Technology |
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UPD360 датащи(HTML) 188 Page - Microchip Technology |
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188 / 221 page  UPD360 DS00002084C-page 188 2016-2017 Microchip Technology Inc. In the final step, 50us after FET D is opened, FET A is shorted. The input to the core regulator now becomes 3V3_ALW. 13.1.5 3V3_ALW POWERED UP FOLLOWED BY VBUS COMING UP In this case, 3V3_ALW is already powered up and VBUS starts to come up. 3V3_ALW will remain the power source for the core and no changes will be made to the FET switches. 13.1.6 POWERED UP WITH VBUS AND 3V3_ALW, VBUS GOING AWAY In this case, 3V3_ALW and VBUS are both present. The core is always powered from 3V3_ALW. If VBUS goes away, nothing changes in the voltage to the core. An interrupt will be generated to the processor to let it know that VBUS status changed. FIGURE 13-11: POWER SWITCH: VBUS FOLLOWED BY 3V3_ALW STEP FIVE 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=1 SWITCH CONTROL VTR_PWRGD VBUS_PWRGD VCORE _PWRGD A C D B 3V3_ALW LDOs VCORE _PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD |
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