LTC4100 datasheet(27/48 Pages) LINER

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LTC1760

1760fa

6. The SMBus Host asserts

BatterySystemStateCont(CHARGING_INHIBIT) high.

7. Hardware controlled charging inhibit is asserted (MODE

low with VDDS high). Refer to “Section 6.2”.

8. The thermistor of the battery being charged indicates

COLD-RANGE and the battery has been charged for longer

than tTIMEOUT.

9. The thermistor of the battery being charged indicates

UNDER-RANGE and the battery has been charged for

longer than tTIMEOUT.

10. The thermistor of the battery being charged indicates

HOT-RANGE.

11. Any SMBus communication line is held low for longer

than tQUERY.

12.BatterySystemStateCont(POWER_NOT_GOOD)ishigh.

13. The emergency turn-off feature has been asserted

using the DCDIV input pin.

3.3 Wake-Up Charging Current and Voltage Limits

The wake-up charging current is fixed at IWAKE_UP for all

values of ILIMIT. Wake-up charging uses the low current

mode described in “Section 10”.

The wake-up charging voltage is not limited by the VLIMIT

function.

3.4 Controlled Charging Initiation

All of the following conditions must be met in order to

allow controlled charging of a given battery. One or both

batteries may be controlled charged at a time.

1. The battery thermistor must be COLD-RANGE, IDEAL-

RANGE, or UNDER-RANGE.

2. AC must be present.

3. BatterySystemStateCont(CHARGING_INHIBIT) must

be de-asserted (or low).

4. Hardware controlled charging inhibit must be

de-asserted (MODE not low with VDDS high). Refer to

“Section 6.2”.

5. The battery responds to an LTC1760 Master read of

Alarm() with all charge alarms deasserted.

6. The battery responds to an LTC1760 Master read of

ChargingVoltage() with a non zero voltage request value.

7. The battery responds to an LTC1760 Master read of

Voltage().

8. The battery responds to an LTC1760 Master read of

ChargingCurrent() with a non zero current request value.

9. The battery responds to an LTC1760 Master read of

Current().

The following charging related functions are polled each

tQUERY: Alarm(), ChargingVoltage(), Voltage(), Charging-

Current(), and Current().

3.5 Controlled Charging Termination

The LTC1760 will terminate controlled charging when any

of the following conditions are met:

1. Battery removal, or thermistor indicating OVER-RANGE.

2. AC removal.

3. The SMBus Host issues a calibration request by setting

BatterySystemStateCont(CALIBRATE) high.

4. An LTC1760 Master read of ChargingCurrent() returning

a zero current request.

5. An LTC1760 Master read of ChargingVoltage() returning

a zero voltage request.

6. Any of the following AlarmWarning() bits asserted high:

OVER_CHARGED_ALARM

TERMINATE_CHARGE_ALARM

TERMINATE_CHARGE_RESERVED

OVER_TEMP_ALARM

Note that the LTC1760 ignores all writes from the battery.

Each battery’s charge alarm is cached inside the LTC1760.

This internally cached bit will be set when any of the upper

four bits of the battery’s AlarmWarning() response are set.

OPERATION

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