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USB3803 Datasheet(PDF) 74 Page - Microchip Technology |
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USB3803 Datasheet(HTML) 74 Page - Microchip Technology |
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74 / 99 page  USB3803 DS00001691B-page 74 2014-2015 Microchip Technology Inc. 8.2 Downstream Port Battery Charging Support The USB3803 can configure any of the downstream ports to support battery charger handshake. The Hub’s role in downstream battery charging is to provide an acknowledge to a device’s query as to if the hub system supports USB battery charging. The hub silicon does not provide any current or power FETs or any such thing to actually charge the device. Those components would need to be provided as external components in the final Hub board design. If the final Hub board design provides an external supply capable of supplying current per the battery charging specifi- cation, the hub can be configured to indicate the presence of such a supply to the device. This indication is on a per/ port basis. i.e. the board can configure two ports to support battery charging (thru high current power FET’s) and leave the other port as a standard USB port. 8.2.1 USB BATTERY CHARGING In the terminology of the USB battery charging specification, if the port is configured to support battery charging, the downstream port is a “Charging Host Port”. All AC/DC characteristics will comply with only this type. If the port is not configured to support battery charging, the port is a “Standard Host Port”. AC/DC characteristics comply with the USB 2.0 specification. A downstream port will only behave as a “Charging Host Port” or a “Standard Host Port”. The port will not switch between “Charging Host Port” or Standard Host Port” at any time after initial power-up and configuration. 8.2.2 SPECIAL BEHAVIOR OF PRTPWR REGISTER BITS The USB Battery charging specification does not address system issues. It only defines a low level protocol for a device and host (or hub) to communicate a simple question and optional answer. Device queries “do you support battery charging?” Host answers “yes, I do support battery charging” or does not answer at all. There is no negative response. (A lack of response is taken as a negative response) When ports are configured for downstream battery charging, the corresponding PRTPWR setting will be controlled by downstream battery charging logic instead of the normal hub logic. Vdat_src and Idat_sink Enable Time TVDPSRC_ON 79 80 84 mS HUB.ChgDet stage on pll Delay from Vdat_- det to end of detec- tion sequence TVDPSRC_HICRNT 79 80 83 mS HUB.ChgDet stage on pll Charger Detection Exit time when dis- abled TVLO_RELEASE 49 50 55 mS HUB.ChgDet stage on pll FIGURE 8-4: BATTERY CHARGING EXTERNAL POWER SUPPLY TABLE 8-2: BATTERY CHARGING TIMING PARAMETERS Characteristic Symbol Min Typ Max Units Conditions SOC VBUS[n] PRTPWR[n] USB3803 (Serial Mapped Register) INT SCL SDA DC Power |
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