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UPD360 Datasheet(PDF) 186 Page - Microchip Technology |
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UPD360 Datasheet(HTML) 186 Page - Microchip Technology |
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186 / 221 page  UPD360 DS00002084C-page 186 2016-2017 Microchip Technology Inc. 13.1.4 VBUS POWERED UP FOLLOWED BY 3V3_ALW COMING UP In this case, VBUS is already powered up and 3V3_ALW starts to come up (and will take over and power the core). Figure 13-7 shows the VBUS only state. Once 3V3_ALW_PWRGD is detected, FET switch C is opened. The diode is required because 3V3_ALW could be greater than or less than VBUS. The voltage at the input to the LDO drops to 3V3_VBUS-0.7V. FIGURE 13-7: POWER SWITCH: VBUS FOLLOWED BY 3V3_ALW STEP ONE FIGURE 13-8: POWER SWITCH: VBUS FOLLOWED BY 3V3_ALW STEP TWO 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS_PWRGD =1 3V3_VBUS LDOs VCORE _PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD 3V3_ALWAYS _PWRGD=0 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_VBUS-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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