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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UPD360 데이터시트(PDF) 185 Page - Microchip Technology |
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UPD360 데이터시트(HTML) 185 Page - Microchip Technology |
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185 / 221 page  2016-2017 Microchip Technology Inc. DS00002084C-page 185 UPD360 13.1.3 VBUS ONLY POWERS UP This is the opposite example from the previous case. In this case, only VBUS powers up (3V3_ALW_PWRGD = 0 throughout, and VBUS_PWRGD = 1 when the threshold is hit). Once VBUS_PWRGD is valid, the internal regulator is turned on and normal operation begins. At no time during this process is the 3V3_ALW rail back driven. FIGURE 13-5: POWER SWITCH: VBUS ONLY POWER UP STEP ONE FIGURE 13-6: POWER SWITCH: VBUS ONLY POWER UP STEP TWO G 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD=1 3V3_ALWAYS_PWRGD=0 3V3_VBUS-0.7V 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 SWITCH CONTROL 3V3_ALWAYS_PWRGD 3V3_VBUS_PWRGD VCORE_PWRGD A C D B 3V3_VBUS LDOs VCORE _PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD |
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