LTC4100 datasheet(14/24 Pages) LINER

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LTC4100

sn4100 4100is

OPERATIO

3. The host may control charging by disabling the Smart

Battery’s ability to transmit ChargingCurrent() and

ChargingVoltage() request functions and broadcasting

the charging commands to the LTC4100 over the SMBus.

4. The LTC4100 will still respond to Smart Battery critical

warning messages without host intervention.

Wake-up Charging Mode

The following conditions must be met in order to allow

wake-up charging of the battery:

1. The SafetySignal must be RES_COLD, RES_IDEAL, or

RES_UR.

2. AC must be present. This is qualified by DCDIV > VACP.

Wake-up charging initiates when a newly inserted battery

does not send ChargingCurrent() and ChargingVoltage()

functions to the LTC4100.

The following conditions will terminate the Wake-up Charg-

ing Mode.

1. A TTIMEOUT period is reached when the SafetySignal is

RES_COLD or RES_UR.

2. The SafetySignal is registering RES_OR.

3. The successful writing of the ChargingCurrent() AND

ChargingVoltage() function. The LTC4100 will proceed to

the controlled charging mode after these two functions are

written.

4. The SafetySignal is registering RES_HOT.

5. The AC power is no longer present. (DCDIV < VACP)

6. The ALARM_INHIBITED becomes set in the

ChargerStatus() function.

7. The INHIBIT_CHARGE is set in the ChargerMode()

function.

8. The CHGEN pin is pulled low by an external device. The

LTC4100 will resume wake-up charging, if the CHGEN pin

is released by the external device. Toggling the CHGEN pin

will not reset the TTIMEOUT timer.

9. There is insufficient DCIN voltage to charge the battery.

The LTC4100 will resume wake-up charging when there is

sufficient DCIN voltage to charge the battery. This condi-

tion will not reset the TTIMEOUT timer.

Controlled Charging Algorithm Overview

The following conditions must be met in order to allow

controlled charging to start on the LTC4100:

1. The ChargingVoltage() AND ChargingCurrent() func-

tion must be written to non-zero values.

2. The SafetySignal must be RES_COLD, RES_IDEAL, or

RES_UR.

3. AC must be present. This is qualified by DCDIV > VACP.

The following conditions will stop the Controlled Charging

Algorithm and will cause the Battery Charger Controller to

stop charging:

1. The ChargingCurrent() AND ChargingVoltage() func-

tions have not been written for TTIMEOUT.

2. The SafetySignal is registering RES_OR.

3. The SafetySignal is registering RES_HOT.

4. The AC power is no longer present. (DCDIV < VACP)

5. ALARM_INHIBITED is set in the ChargerStatus() func-

tion.

6. INHIBIT_CHARGE is set in the ChargerMode() function.

Clearing INHIBIT_CHARGE will cause the LTC4100 to

resume charging using the previous ChargingVoltage()

AND ChargingCurrent() function values.

7. RESET_TO_ZERO is set in the ChargerMode() function.

8. CHGEN pin is pulled low by an external device. The

LTC4100 will resume charging using the previous

ChargingVoltage() AND ChargingCurrent() function val-

ues, if the CHGEN pin is released by the external device.

9. Insufficient DCIN voltage to charge the battery. The

LTC4100 will resume charging using the previous

ChargingVoltage() AND ChargingCurrent() function val-

LTC4100 数据表(PDF) 14 Page - Linear Technology

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