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USB3320 数据表(PDF) 23 Page - Microchip Technology |
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USB3320 数据表(HTML) 23 Page - Microchip Technology |
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23 / 70 page  2014-2015 Microchip Technology Inc. DS00001792B-page 23 USB3320 The USB3320 can be powered from an external 3.3V supply as shown below in Figure 5-7. When using the external supply, both the VBAT and VDD33 pins are connected together. The bypass capacitor, CBYP, is recommended when using the external supply. For peripheral only or host only operation, the VBAT supply shown below in Figure 5-8 may be connected to the VBUS pin of the USB connector for bus powered applications. In this configuration, external overvoltage protection is required to protect the VBAT supply from any transient voltage present at the VBUS pin of the USB connector. FIGURE 5-6: POWERING THE USB3320 FROM A BATTERY FIGURE 5-7: POWERING THE USB3320 FROM A 3.3V SUPPLY VBUS VDD33 VBAT GND LDO PHY To OTG COUT VBUS To USB Con. RVBUS VBUS VDD33 VBAT GND LDO PHY To OTG CBYP Vdd 3.3V VBUS To USB Con. RVBUS |
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