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LTC4110

4110fa

OPERATION

be set to indicate calibration in progress. Soft-start ramps

the discharge current at a rate set by the capacitor on the

ITH pin (typically 10ms with 0.1μF capacitor). A limit to

how far the battery cell voltage will be discharged during

calibration can be programmed with the VCAL pin (Li-Ion

default = 2.75V/cell, lead acid default = 1.93V/cell, Smart

NiMH/NiCd default = 0.95V/cell). When the limit is reached

calibration is terminated, the CAL_COMPLETE bit in the

BBuStatus() register is set, the CAL_ON bit in the BBuS-

tatus() register will be cleared and the charge mode is

automatically entered to begin recharging the battery. If

the GPIO3 is conﬁgured as a calibration complete status

output (CAL_COMPLETEb), it will be forced low until reset

by the CAL_RESET write bit. Calibration is inhibited during

backup or shutdown modes. Calibration is also inhibited

when a thermistor is sensed absent.

During calibration, user-programmable supply back-drive

protections are provided. These protections prevent a

reversal of current into the main supply and/or possibly

raising the supply voltage to unsafe levels should the

Figure 5. SLA Charge State Diagram (Does Not Include Calibration)

4110 F05

PWM

STOPPED

(BATTERY OVP)

STOP

(OVERTEMPERATURE)

ANY

CHARGE

STATE

RESUME

CHARGE

STATE

ANY

CHARGE

STATE

RESET

STOP

CHARGE

Logic Event (T = True, F = False) [Notes]

Notes and/or Actions (T = True, F = False)

RES_OR = F & DCDIV pin = T & SHDN pin = F & CHARGE_INHIBITED = F &

CHG_FLT = F

ICHG = On & CHG = T

VAR = T [AutoRestart]

ChargingVoltage() & ChargingCurrent() ≠ 0 sent

ALARM_INHIBITED = F

ChargingVoltage() or ChargingCurrent() = 0 sent

RESET_TO_ZERO = T [See ChargeMode()]

CHARGE_INHIBIT = T [See ChargeMode()]

ICHG = Off & CHG = F

DCDIV pin = F

RES_OR = T [Bat Removed, See ChargeStatus()]

SHDN pin = T

VUVD = T

POR_RESET = T [See ChargeMode()]

ICHG = Off & CHG = F & CHARGE_INHIBITED = F &

ALARM_INHIBITED = F

RES_HOT = T & RES_UR = F [See ChargeStatus()]

ICHG = Off & CHG_FLT = T

RES_HOT = F [See ChargeStatus()]

ICHG = On & CHG_FLT = F

7VBOV = T

PWM stopped. Timers remain running.

8VBOV = F

PWM restarted.

AlarmWarning() command is sent by Smart Battery over SMBus with any of

the following bits set to True:

OVER_CHARGED_ALARM

TERMINATE_CHARGE_ALARM

Reserved ALARM

OVER_TEMPERATURE_ALARM

ICHG = Off & CHG = F & ALARM_INHIBITED = T

(ALARM_INHIBITED bit is found in ChargeStatus())

Note: For all charge states, VCHG is always active

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