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ACT2861QI Scheda tecnica(PDF) 22 Page - Active-Semi, Inc |
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ACT2861QI Scheda tecnica(HTML) 22 Page - Active-Semi, Inc |
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22 / 91 page  ACT2861QI Rev 2.0, 27-Apr-2018 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi Copyright © 2018 Active-Semi, Inc. 22 In this state, the Low Battery Safety Timer is turned off and reset. The Fast Charge Safety Timer starts running at the nominal rate to detect faults with battery charging. This timer can be adjusted between 30 minutes and 16 hours, using the I2C bits FC_SAFETY_TIMER in regis- ter 0x1Bh. If a battery temperature fault condition is de- tected, the charger moves to the FAULT state. See the Charge Safety Timers section for further details. A Fast Charge Safety Timer timeout or Battery OV fault during this state causes the charger to move to the Fault State, and disable charging. An input voltage UV or OV condition also moves the state machine into the Fault state. Finally, a fault on the VREG LDO, which is not masked with the DIS_CHG_VREG_FLT register moves the state machine into the Fault state. If the battery voltage drops below the VBATLOW volt- age for 16ms, the charger goes back into the Battery Precondition state. During this state, the VIN voltage and VIN Current reg- ulation loops are active to ensure the input supply power ratings are not exceeded. Additionally, the thermal reg- ulation loop is active to keep the ACT2861 junction tem- perature at or below the desired maximum junction tem- perature. See the appropriate sections for more details. During this state the nCHG pin is pulled low to indicate charging is in progress. Fast Charge Temp Suspend (FCSUSPEND) This state prevents charging when the battery tempera- ture measured by the TH pin exceeds the JEITA or Bat- tery Temp registers settings for Hot or Cold. The state machine only enters FCSUSPEND from the FASTCHG state. The charger transitions back to the FASTCHG state and resumes charging when the temperature re- turns to allowable levels. The system can force the IC out of the FCSUSPEND state by disabling the TH input via I2C. In this state, the Fast Charge Safety Timer is suspended, but held at its current value. The timer resumes counting when charging resumes. During this state the nCHG output blinks at 1HZ to indi- cate a fault condition. Charge Full State (CHGFULL) The Charge Full state functionality is the same as the FASTCHG state. The charger can stay in the CHGFULL state indefinitely. It keeps a fully charged battery regu- lated to the VBAT_REG voltage. If something pulls cur- rent from the battery, the charger supplies current to maintain the battery voltage at VBAT_REG. The maxi- mum charge current is still limited by the external OLIM resistor and the IFCHG[6:0] register. During normal charging, the charger enters CHGFULL state from the FASTCHG state when the charging cur- rent drops below ITERM for greater than 750ms AND the I2C bit EN_TERM = 0. If the charge current exceeds the ITERM current for 16ms, or if the battery voltage drops below VBAT_GOOD for 16ms, the IC exits the Charge Full state and moves back to the FASTCHG state. A Battery Temp or Battery OV fault during this state causes the charger to move to the Fault state and disa- ble charging. An input UV or OV condition also moves the state machine into the Fault state. Finally, a fault on the VREG LDO, which is not masked with the DIS_CHG_VREG_FLT register moves the state ma- chine into the Fault state. In this state, the Fast Charge Safety Timer and the Low Battery Safety Timer are reset and held at 0. During this state the nCHG pin is HIZ to indicate the charging has completed and the Fast Charge Safety Timer is reset and held at 0. Charge Full Suspend (CFSUSPEND) This state prevents charging when the battery tempera- ture measured by the TH pin exceeds the JEITA or Bat- tery Temp registers settings for Hot or Cold. The state machine only enters CFSUSPEND from the CHGFULL state. The charger transitions back to the CHGFULL state and resumes charging when the temperature re- turns to allowable levels. The system can force the IC out of the CFSUSPEND state by disabling the TH input via I2C. In this state, the Fast Charge Safety Timer is still held at 0. During this state the nCHG output blinks at 1HZ to indi- cate a fault condition. Battery Termination State (CHGTERM) In this state, the charger is disabled and does not supply any current to the battery. It monitors the battery voltage to check for the condition when the battery voltage drops to VTERM-VRECHARGE. The VRECHARGE voltage is typically 100mV or 150mV per cell. Once the battery voltage drops below the threshold, the IC enters the Fast Charge state and recharges the battery. During normal charging, the charger enters this state when the charging current drops below ITERM for greater than 750ms AND the I2C bit EN_TERM = 1. In this state, the Fast Charge Safety Timer and the Low Battery Safety Timer are reset and held at 0. |
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