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XR21B1422IL40-F Datasheet(PDF) 11 Page - Exar Corporation |
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XR21B1422IL40-F Datasheet(HTML) 11 Page - Exar Corporation |
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11 / 60 page  © 2014 Exar Corporation XR21B1422 11 / 60 exar.com/XR21B1422 Rev 1A USB Power Modes The XR21B1422 device may be configured in any of the following power modes: bus-powered, self-powered 5V, or self- powered 3.3V. In all three modes, the VBUS power signal from the USB host must be connected to the VBUS_SENSE pin of the device. The default power mode for the XR21B1422 is bus powered. In this mode, the USB device’s maximum power requirement from the host must be specified. In this context, the USB device includes all components on the PCB that will draw power from the USB host VBUS power. The default maximum power for the XR21B1422 is 100mA. This may be changed using the Attributes field in the OTP. Bus-Powered In bus-powered mode, VBUS from the USB cable supplies 5V to the XR21B1422 device. The VCC pin will supply a 3.3V output. The VIO pins may be externally connected to VCC or to an alternate voltage source. Figure 1: Bus-Powered Mode Self-Powered 5V In self-powered 5V mode, a local source provides 5V to the XR21B1422 device. The USB attributes should be changed in the OTP to correctly report self-powered mode. The VCC pin will supply a 3.3V output. VIO pins may be externally con- nected to VCC or to an alternate voltage source. Figure 2: Self-Powered 5V Mode VCC_REG VBUS_SENSE XR21B1422 Dp Dm GND VCC VBUS Dp Dm GND USB Connector VIO VCC_REG VBUS_SENSE XR21B1422 Dp Dm GND VCC VBUS Dp Dm GND USB Connector VIO 5V Supply |
Similar Part No. - XR21B1422IL40-F |
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Similar Description - XR21B1422IL40-F |
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