Currently system Battery VBUS External 3 3 V

Currently system Battery VBUS External 3. 3 V 1. 3 V LDOI External 3. 3 V DVDDRTC USB_LDOO ANA_LDOO External 1. 3 V DSP_LDOO CVDDRTC CVDD External 3. 1 V EN VDDA_PLL VDDA_ANA USB_VDD 1 P 3 USB_VDDA 1 P 3 USB Core DVDDIO USB_VDDOSC USB_VDDPLL USB_VDDA 3 P 3 Switch Reset EN VBUS pin n. RESET pin USB PHY

Battery VBUS Solution 1 External 3. 3 V 1. 3 V LDOI External 3. 3 V DVDDRTC External 3. 1 V EN USB_LDOO ANA_LDOO External 1. 3 V DSP_LDOO CVDDRTC CVDD VDDA_PLL VDDA_ANA USB_VDD 1 P 3 USB_VDDA 1 P 3 USB Core DVDDIO USB_VDDOSC USB_VDDPLL USB_VDDA 3 P 3 Switch Reset EN VBUS pin n. RESET pin USB PHY

Battery VBUS External 3. 3 V Solution 2 Is this an External LDO [Kaka] No. This LDO is “USB_LDOO” on C 5535. External 3. 3 V 1. 3 V LDOI DVDDRTC EXternal 3. 1 V EN USB_LDOO ANA_LDOO External 1. 3 V DSP_LDOO CVDDRTC CVDD VDDA_PLL Can you explain why “EN” [Kaka] This LDO has enable pin. So, the 3. 1 V line for DVDDIO will be enabled by ANA_LDOO output voltage. Why this Path ? [Kaka] I had a mistakes. This line has a 3. 3 V LDO. This line will use as power supply in case of connecting the USB. VDDA_ANA USB_VDD 1 P 3 USB_VDDA 1 P 3 USB Core DVDDIO USB_VDDOSC USB_VDDPLL EN Switch Reset USB_VDDA 3 P 3 VBUS pin n. RESET pin USB PHY