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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) 184 Page - Microchip Technology |
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UPD360 датащи(HTML) 184 Page - Microchip Technology |
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184 / 221 page  UPD360 DS00002084C-page 184 2016-2017 Microchip Technology Inc. 13.1.2 3V3_ALW ONLY POWERS UP In this case, only 3V3_ALW powers up (VBUS_PWRGD = 0 and 3V3_ALW_PWRGD = 1). When this occurs, FET switch D is opened. After 50us, FET switch A is shorted. This sequence eliminates the possibility of back-drive when the diode is shorted to eliminate the voltage drop. FIGURE 13-3: POWER SWITCH: POWERING UP STEP ONE FIGURE 13-4: POWER SWITCH: POWERING UP STEP TWO G 3V3_ALW 3V3_VBUS VSW A B C D VBUS_PWRGD=0 3V3_ALWAYS _PWRGD=1 SWITCH CONTROL 3V3_ALWAYS _PWRGD 3V3_VBUS_PWRGD VCORE_PWRGD A C D B 3V3_ALW-0.7V LDOs VCORE_PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD G 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS _PWRGD =0 3V3_ALWAYS _PWRGD=1 3V3_ALW 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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