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USB334X 数据表(PDF) 40 Page - Microchip Technology |
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USB334X 数据表(HTML) 40 Page - Microchip Technology |
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40 / 92 page  USB334x DS00002646A-page 40 2009-2018 Microchip Technology Inc. 3. Device enters Device Charger Detection mode. If the VdatDet bit is 0 then the host is a Standard Downstream Port (SDP) and the device will draw the standard 500mA of current and enter the Device USB Operation mode. If the VdatDet bit is 1 then the host is a charger that can supply at least 1.5A of current, the device will go to the next mode. 4. Device enters Device Enhanced Charger Detection mode. If the VdatDet bit is 0 then the device is connected to a Charging Downstream Port (CDP) and the device will enter the Device USB Operation mode. If the VdatDet bit is 1 then the device is connected to a Dedicated Charging Port (DCP) and the device will not try to enumerate. 5. The charger detection is complete. 5.9.2 RESISTIVE CHARGER DETECTION To support the detection and identification of different types of USB chargers the USB334x provides integrated pull-up resistors, RCD, on both DP and DM. These pull-up resistors along with the single ended receivers can be used to deter- mine the type of USB charger attached. Reference information on implementing charger detection is provided in Section 8.2. 5.10 USB Audio Support (USB3341 and USB3346) The USB334x provides two low resistance analog switches that allow analog audio to be multiplexed over the DP and DM terminals of the USB connector. The audio switches are shown in . The electrical characteristics of the USB Audio Switches are provided in Table 4-11. During normal USB operation the switches are off. When USB Audio is desired the switches can be turned “on” by enabling the SpkLeftEn, SpkRightEn, or MicEn bits in the Carkit Control register as described in Section 6.7.2, "USB Audio Mode (USB3341 and USB3346)," on page 61. These bits are disabled by default. The RESETB pin must be high when using the analog switches so that the VDD33 supply is present. If the VDD33 sup- ply is applied externally and RESETB is held low the switches will be off. In addition to USB Audio support the switches could also be used to multiplex a second Full Speed USB transceiver to the USB connector. The signal quality will be degraded slightly due to the “on” resistance of the switches. The USB334x single-ended receivers described in Section 5.2.1, "USB Transceiver," on page 25 are enabled while in synchronous mode and are disabled when Carkit Mode is entered. Note: The Resistive Charger Detection has been superseded by the Active Analog Charger Detection (USB-IF Battery Charging 1.2) detailed above. It is recommended that new designs use the Active Analog Charger Detection (USB-IF Battery Charging 1.2). TABLE 5-8: USB WEAK PULL-UP ENABLE RESETB DP Pullup Enable DM Pullup Enable 00 0 1 ChargerPullupEnableDP ChargerPullupEnableDM Note: ChargerPullupEnableDP and ChargerPullupEnableDM are enabled in the USB IO & Power Management register. Note: The USB334x supports “USB Digital Audio” through the USB protocol in ULPI and USB Serial modes described in Section 6.0, "ULPI Operation," on page 42. |
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