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USB3803 データシート(PDF) 86 Page - Microchip Technology |
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USB3803 データシート(HTML) 86 Page - Microchip Technology |
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86 / 99 page  USB3803 DS00001691B-page 86 2014-2015 Microchip Technology Inc. 11.0 APPLICATION REFERENCE 11.1 Application Diagram The USB3803 requires several external components to function and insure compliance with the USB 2.0 specification. TABLE 11-1: COMPONENT VALUES IN APPLICATION DIAGRAMS Reference Designator Value Description Notes CVDD12BYP 1.0 μF Capacitor to ground for regulator stability. Place as close to the USB3803 as possible CVDD33BYP 4.7 μF Capacitor to ground for regulator stability. Place as close to the USB3803 as possible COUT 0.1 μF Bypass capacitor to ground. Place as close to the USB3803 as possible RBIAS 12.0k Series resistor to establish reference voltage used by analog circuits. Place as close to the USB3803 as possible RPU1 10k or 1k Pull-up for I2C bus. 10k for 100kHz or 400kHz operation. 1k for 1MHz opera- tion. RPU2 10k (or greater) Pull-up for open-drain outputs TABLE 11-2: CAPACITANCE VALUES AT VBUS OF USB CONNECTOR Port MIN Value MAX Value Downstream 120 μF Upstream 1 μF10μF |
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