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UPD360 датащи(PDF) 183 Page - Microchip Technology |
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UPD360 датащи(HTML) 183 Page - Microchip Technology |
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183 / 221 page ![]() 2016-2017 Microchip Technology Inc. DS00002084C-page 183 UPD360 13.1 Operation 13.1.1 POWER UP When the device is powering up, both VBUS_PWRGD and 3V3_ALW_PWRGD are low. Under these conditions, switches A and C are open, B and D are closed. The voltage going to the input of the core regulator is the higher of 3V3_ALW and 3V3_VBUS. The diodes prevent back drive. FIGURE 13-2: POWER SWITCH: POWERING UP G 3V3_ALW 3V3_VBUS VSW A B C D 3V3_VBUS _PWRGD=0 3V3_ALWAYS _PWRGD=0 SWITCH CONTROL 3V3_ALWAYS _PWRGD 3V3_VBUS _PWRGD VCORE _PWRGD A C D B LDOs VCORE_PWRGD 1.8V Analog 1.8V Core EN VMUX_PWRGD |
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