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LTC4100 数据表(PDF) 30 Page - Linear Technology |
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LTC4100 数据表(HTML) 30 Page - Linear Technology |
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30 / 48 page  LTC1760 30 1760fa Power Reporting for Batteries Being Calibrated AC_PRESENT CALIBRATE_BAT2 CALIBRATE_BAT1 POWERED_BY_BAT(4:1) 1 0 0 0000b 1 1 1 0001b 1 1 0 0010b *States not shown are not allowed Power Reporting as a Function of Battery Presence AC_PRESENT PRESENT_BAT2 PRESENT_BAT1 POWERED_BY_BAT(4:1) 1 X X 0000b 0 0 0 0000b 0 0 1 0001b 0 1 0 0010b 0 1 1 0011b Power Reporting with AC_PRESENT Low and both Batteries Present, as a Function of Power Alarms. AC_PRESENT BATTERY 2 POWER ALARM (NOTE 1) BATTERY 1 POWER ALARM (NOTE 1) POWERED_BY_BAT(4:1) 0 0 0 0011b 0 0 1 0010b 0 1 0 0001b 0 1 1 0011b 1 X X 0000b Note 1: A power alarm means that ALARM() has returned TERMINATE_DISCHARGE=1 or FULLY_DISCHARGED_ALARM=1 Power Reporting When BatterySystemStateCont(POWER_NOT_GOOD) is High and the LTC1760 has Autonomously Entered 3-Diode Mode AC_PRESENT PRESENT_BAT2 PRESENT_BAT1 POWERED_BY_BAT(4:1) 0 0 0 0000b 0 0 1 0001b 0 1 0 0010b 0 1 1 0011b 1 0 0 0000b 1 0 1 0000b 1 1 0 0000b 1 1 1 0000b OPERATION 2. A battery issues a TERMINATE_DISCHARGE alarm and AC_PRESENT is low. The LTC1760 will select the other battery to power the system. 3. A battery issues a TERMINATE_DISCHARGE alarm, AC_PRESENT is low, and the other battery is not present or has previously issued an alarm. The LTC1760 will au- tonomously try to restore power by entering 3-Diode mode. The 3-Diode mode will ignore TERMINATE_DISCHARGE and FULLY_DISCHARGED alarms. 4.3 Power-By Algorithm When a Battery is Being Calibrated During battery calibration, the battery being calibrated is the only device powering the system. This will be reflected in the reported POWER_BY[4:1] bits. See “Section 5” for more information on battery calibration. 4.4 Power-By Reporting The following tables illustrate how BatterySystem State(POWER_BY_BAT[4:1]) interprets PowerPath conditions. 5 Battery Calibration (Conditioning) Calibration allows the SMBus Host to fully discharge a battery for conditioning purposes. The SMBus Host may determine the battery to be discharged or allow the LTC1760 to choose based on the batteries’ request to be conditioned. 5.1 Selecting a Battery to be Calibrated Option 1) SMBus Host chooses battery to be calibrated using BatterySystemStateCont(CALIBRATE_BAT[4:1]) Allowed values: 0001b: Set CALIBRATE_BAT1. Only has an effect if Bat- tery 1 BatteryMode(CONDITION_FLAG) is high . May not be updated if a calibration is in progress. 0010b: Set CALIBRATE_BAT2. Only has an effect if Battery 2 BatteryMode(CONDITION_FLAG) is high. May not be updated if a calibration is in progress. |
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