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USB3370 数据表(PDF) 31 Page - Microchip Technology |
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USB3370 数据表(HTML) 31 Page - Microchip Technology |
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31 / 75 page  2012 - 2015 Microchip Technology Inc. DS00001915B-page 31 USB3370 5.9.1 ACTIVE ANALOG CHARGER DETECTION (USB-IF BATTERY CHARGING 1.1) The USB3370 includes the active analog charger detection specified in the USB-IF Battery Charging Specification. The additional analog circuitry will allow the USB3370 to: 1. Detect a Dedicated Charging Port (DCP) with the DP and DM pins shorted together. 2. Detect a Standard Downstream Port (SDP) which has no battery charging circuitry. 3. Detect a Charging Downstream Port (CDP) which actively supplies voltage to the DM pin when connected to a USB-IF BC 1.1 compatible device. 4. Behave as a Charging Downstream Port by enabling the voltage source on the DM pin. The charger detection circuitry is shown in Figure 5-10. The VdatDet output is qualified with the Linestate[1:0] value. If the Linestate is not equal to 00 the VdatDet signal will not assert. The proper detection process flows through different modes of detection and uses the linestate and VdatDet signals values to determine the connection. Table 5-7 describes the bit values that need to be set to enter each mode. 5.9.1.1 Example Charger Detection Flow - Dedicated Charging Port The USB-IF Battery Charging 1.1 specification describes in detail the flow for each charger type, but below is an exam- ple of the flow used to detect a Dedicated Charger (DCP). 1. Device detects VBUS voltage is present from RXCMD, (SESS_VLD is 1) 2. Device enters the Device Connect Detect mode. - If the linestate still equals 10 after a specified timeout, the charger is an unknown charger and there will be no attempted USB enumeration. - If the linestate equals 00 or 11, the device will go to the next mode: 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 stan- dard 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. TABLE 5-7: USB CHARGER SETTING VS. MODES Charger Detection Modes Device Connect Detect (The Connect Detect setting in Table 5-1 must be followed) 00 1001 Device Charger Detection 1 1 0000 Device Enhanced Charger Detection 1 1 0100 Device USB Operation 0 0 0000 Charging Host Port, no charging device attached and SE0 (VdatDet = 0) 01 0111 Charging Host Port, charging device attached (VdatDet = 1) 11 0111 Charging Host Port USB Operation 0 0 0111 |
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