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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UPD360 데이터시트(PDF) 189 Page - Microchip Technology |
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UPD360 데이터시트(HTML) 189 Page - Microchip Technology |
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189 / 221 page  2016-2017 Microchip Technology Inc. DS00002084C-page 189 UPD360 13.1.7 POWERED UP WITH VBUS AND 3V3_ALW, 3V3_ALW GOING AWAY In this case, 3V3_ALW and VBUS are both present. The core is always powered from 3V3_ALW. If 3V3_ALW goes away, the switch will first transition to the initial power on state, then transition to the VBUS only state. First FET A is opened. The voltage at the core regulator input goes to 3V3_ALW-0.7 FIGURE 13-12: POWER SWITCH: VBUS PRESENT, 3V3_ALW GOING AWAY STEP ONE FIGURE 13-13: POWER SWITCH: VBUS PRESENT, 3V3_ALW GOING AWAY STEP TWO G 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=( 1 0) 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 3V3_ALW 3V3_ VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=0 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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