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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) 187 Page - Microchip Technology |
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UPD360 датащи(HTML) 187 Page - Microchip Technology |
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187 / 221 page  2016-2017 Microchip Technology Inc. DS00002084C-page 187 UPD360 50us after FET C is opened, FET B is shorted. The two diodes ensure there is no back drive. The input to the core reg- ulator will be at the higher voltage of VBUS - 0.7V or 3V3_ALW - 0.7V. 50us after FET B is shorted, FET D is opened. The core regulator input is now 3V3_ALW - 0.7V. FIGURE 13-9: POWER SWITCH: VBUS FOLLOWED BY 3V3_ALW STEP THREE FIGURE 13-10: POWER SWITCH: VBUS FOLLOWED BY 3V3_ALW STEP FOUR 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=1 Higher of 3V3_VBUS-0.7 or 3V3_ALW-0.7 LDOs VCORE _PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD SWITCH CONTROL 3V3_ALWAYS_PWRGD 3V3_VBUS_PWRGD VCORE _PWRGD A C D B 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=1 3V3_ALW-0.7 LDOs VCORE_PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD SWITCH CONTROL 3V3_ALWAYS_PWRGD 3V3_VBUS_PWRGD VCORE_PWRGD A C D B |
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