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LC709511FQD-A00TWG Datasheet(PDF) 11 Page - ON Semiconductor |
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LC709511FQD-A00TWG Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 25 page  LC709511F REFERENCE SOFTWARE www.onsemi.com 11 Mode transition This device is set to a Low power mode to minimize power consumption when no USB device is connected. If the connection is detected, it transitions into Operating mode. FW02 In Figure 9: FW02 state diagram, when the VBUS1 rise (input) is detected and VBUS1 voltage exceeds the VBDET, it transitions from Low power mode to Operating mode. Buck charge is started when VBUS1 voltage exceeds the VBUVP. If the input plug is removed, it will transition into the Low power mode again. During the Low power mode, if the output plug insertion is detected or the push button is pressed long, it transitions into the Operating mode to start 5 V Boost charge. If the detected port is USB2, at first 5 V is applied to VCC, then it opens GATE2. USB2 port will start as Quick Charge 3.0 HVDCP. 9 V or 12 V or Continuous mode request is received from the portable device, the Boost voltage will automatically change according to the request. If USB3 with External Boost-IC is connected, BSTEN is set to “HIGH” to output 5 V. Boost charge will stop under following conditions of: a) Plug for the output is removed, b) Output current to the connected portable device falls under IBTERM, c) Built-in battery voltage is judged as low, or d) Input plug is connected. If all Boost charge stops and input plug doesn’t be connected, this device will transition into the Low power mode. If both the output-plugs and the input plug are connected, it will transition into Buck charge. Refer to Table 5. FW05 In Figure 10: FW05 state diagram. Low power mode will transition into the Operating mode under following conditions of: a) CC1 or CC2 ports detect a device is attached, or b) VBUS1 voltage exceeds the VBUVP, or c) Connection to USB3 port is detected by VB3DET, or d) Push button is pressed for long. If this device detects VBUS1 rising or Attached.SNK of USB1 port, it will start Buck Charge. If it detects Attached.SRC of USB1 port or connection to USB3 port, it will start Boost charge. Boost charge can be performed for USB1 and USB3 ports at the same time. If all Boost charge stops and CC ports are Unattached, it will transition into the Low power mode again. Figure 11 shows detailed Type-C port state diagram. When CC ports are in Unattached state, it alternates between Unattached.SRC and Unattached.SNK. It outputs Rp in the Unattached.SRC, and outputs Rd in the Unattached.SNK. The Rp current in Unattaced.SRC and AttachWait.SRC is fixed to the value for default USB. In Unattached.SNK If Rp is detected on CC1 or CC2, it transits into AttachWait.SNK. In addition when VBUS1 voltage exceeds VBUVP, it will transit into Attached.SNK and start Buck charge. In Unattached.SRC if Rd or Ra is detected on CC1 or CC2 port, it transits into AttachWait.SRC. In AttachWait.SRC if VBUS1 voltage is lower than VSAFE0V, it checks CC1 and CC2 status and transits according to Table 6. When Ra is connected to CC1 or CC2, the other open port keeps toggling. When it becomes to Attached.SRC, it will start Boost charge. In Attached.SRC Rp current becomes to the set value by Software configuration. Refer to Table 14. Table 5 Connected device vs charge modes FW02 Connected device Charge mode USB1 Micro-B USB2 Type-A USB3 Type-A Source Buck charge Source Sink Source Sink Source Sink Sink Sink Boost USB2 Sink Boost USB3 Sink Sink Boost USB2 & USB3 FW05 Connected device Charge mode USB1 Type-C USB3 Type-A Source Buck charge Source Sink Sink Boost USB1 Sink Boost USB2 Sink Sink Boost USB1 & USB3 Table 6 CC status to judge sink CC1 CC2 State Open Open Nothing attached Rd Open Enter Attached.SRC Open Rd Open Ra Attached CC: Keep AttachWait.SRC Unattached CC: Keep toggling Ra Open Rd Ra Enter Attached.SRC Ra Rd Rd Rd Keep AttachWait.SRC Ra Ra |
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