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ACT5880 Datasheet(PDF) 84 Page - Active-Semi, Inc |
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ACT5880 Datasheet(HTML) 84 Page - Active-Semi, Inc |
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84 / 87 page  ACT5880 Rev 2, 03-Sep-13 - 84 - www.active-semi.com ActivePMU TM and ActivePathTM are trademarks of Active-Semi. I2CTM is a trademark of NXP. Copyright © 2013 Active-Semi, Inc. Active-Semi Confidential―Do Not Copy or Distribute could start normal operation and possibly changes the I/O output, the ACT5880 preconditions and then charges battery with only 90mA current limit, as specified in the "Battery Charging", until the battery is charged to high enough voltage for device system to start. If USB attaching is identified in a battery normal system, the device system should start and try to connect the host within 100ms, as required by the USB protocol. Within this 100ms, 100mA drawn from the port is allowed, what is greater than the 90mA the ACT5880 takes. After the connection , the device system takes control of charging, either charging as a standard load to USB port or pouring larger current as allowed, or turning into USB SUSPEND without charging. Fast Charge Current Adaptive The over load to the USB port or a weak adaptor could be identified by the loss of reading CHGIN valid while the ACIN keeps reading valid. If the over load happens, the device system could program the ACT5880 to a less fast charge current volume to make the power source normal while still getting as much as possible power. Dual inputs and USB-OTG Paths In applications that 2 power input receptacles wanted, 2 low forward voltage diodes and a 240kΩ resistor RDAD are used in addition to circuit in Figure 20, as showed in Figure 21. When no suitable input attaches to the Adaptor In, the circuit works similarly to the circuit in the Figure 20. When suitable input attaches to the Adaptor In, both ACIN and CHGIN are read valid, regardless what attaches to the USB receptacle. Figure 21: The Sample Circuit for Dual-inputs Charging. Figure 22 is the typical circuit connecting a 5V internal rail to the VBUS for providing power for OTG application. In this circuit the QOTG has to be with VGTH greater than 2V and to be effectively conductive when VGTH is 5V. The QOTG is used to isolate the capacitance on 5V rail during the VBUS pulsing required by the SRP, and also provides a controlled path for using the external 5V from VBUS to replace the internal 5V rail. Figure 22: The Sample Circuit for Using External 5V rail. Figure 23: The Sample Circuit of Dual-inputs and External 5V. Figure 23 is a sample of providing high current 5V from an adaptor to the VBUS and for replacing the internal 5V rail. All the 3 PFETs should be good for control with 3V I/O, level shifters are desired otherwise. ACIN RISO ACT5880 DDN DDP Device USB I/F RDUP RDDW VBUS CHGIN D+ D- RDAD Adaptor In Foreign Adaptor or USB VBUS USB connectors ACT5880 VCC Device System VBUS D+ D- VBUS RIDUP 5V rail CHGIN ID 3V I/O QOTG ACIN RISO ACT5880 DDN DDP Device USB I/F RDUP RDDW VBUS CHGIN D+ D- RDAD Adaptor In VCC RIDUP 5V rail 3V I/O QOTG VBUS ID 3V I/O 3V I/O |
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