LTC4100 datasheet(11/24 Pages) LINER

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LTC4100

sn4100 4100is

OPERATIO

The ENABLE_POLLING bit is not supported by the LTC4100.

Values written to this bit are ignored.

The POR_RESET bit sets the LTC4100 to its power-on

default condition.

The RESET_TO_ZERO bit sets the ChargingCurrent()and

ChargingVoltage() values to zero. This function ALWAYS

clears the ChargingVoltage() and ChargingCurrent() val-

ues to zero even if the INHIBIT_CHARGE bit is set.

ChargerStatus() ('h13)

Description: The SMBus Host uses this command to read

the LTC4100’s status bits.

Purpose: Allows the SMBus Host to determine the status

and level of the LTC4100.

• SMBus Protocol: Read Word.

Output: The CHARGE_INHIBITED bit reflects the status of

the LTC4100 set by the INHIBIT_CHARGE bit in the

ChargerMode() function.

The POLLING_ENABLED, VOLTAGE_NOTREG, and

CURRENT_NOTREG are not supported by the LTC4100.

The LTC4100 always reports itself as a Level 2 Smart

Battery Charger.

CURRENT_OR bit is set only when ChargingCurrent() is

set to a value outside the current regulation range of the

LTC4100. This bit may be used in conjunction with the

INHIBIT_CHARGE bit of the ChargerMode() and

ChargingCurrent() to determine the current capability of

the LTC4100. When ChargingCurrent() is set to the pro-

grammatic maximum current + 1, the CURRENT_OR bit

will be set.

VOLTAGE_OR bit is set only when ChargingVoltage() is

set to a value outside the voltage regulation range of the

LTC4100. This bit may be used in conjunction with the

INHIBIT_CHARGE bit of the ChargerMode() and

ChargingVoltage() to determine the voltage capability of

the LTC4100. When ChargingVoltage() is set to the

programmatic maximum voltage, the VOLTAGE_OR bit

will be set.

The RES_OR bit is set only when the SafetySignal resis-

tance value is greater than 95k

Ω. This indicates that the

SafetySignal is to be considered as an open circuit.

The RES_COLD bit is set only when the SafetySignal

resistance value is greater than 28.5k

Ω. The SafetySignal

indicates a cold battery. The RES_COLD bit will be set

whenever the RES_OR bit is set.

The RES_HOT bit is set only when the SafetySignal resis-

tance is less than 3150

Ω, which indicates a hot battery.

The RES_HOT bit will be set whenever the RES_UR bit is

set.

The RES_UR bit is set only when the SafetySignal resis-

tance value is less than 575

Ω.

ALARM_INHIBITED bit is set if a valid AlarmWarning()

message has been received and charging is inhibited as a

result. This bit is cleared if both ChargingVoltage() and

ChargingCurrent() are re-written to the LTC4100, power is

removed (DCDIV < VACP), or if a battery is removed. The

setting of the ALARM_INHIBITED will activate the LTC4100

SMBALERT pull-down.

POWER_FAIL bit is set if the LTC4100 does not have

sufficient DCIN voltage to charge the battery or if an

external device is pulling the CHGEN input signal low.

Charging is disabled whenever this bit is set. The setting

of this bit does not clear the values in the ChargingVoltage()

and ChargingCurrent() function values, nor does it neces-

sarily affect the charging modes of the LTC4100.

BATTERY_PRESENT is set if a battery is present otherwise

it is cleared. The LTC4100 uses the SafetySignal

in order to determine battery presence. If the LTC4100

detects a RES_OR condition, the BATTERY_PRESENT bit

is cleared immediately. The LTC4100 will not set the

BATTERY_PRESENT bit until it successfully samples the

SafetySignal twice and does not detect a RES_OR condi-

tion on either sampling. If AC is not present (e.g. DCDIV <

VACP), this bit may not be set for up to one-half second

after the battery is connected to the SafetySignal. The

ChargingCurrent() and ChargingVoltage() function values

are immediately cleared whenever this bit is cleared.

Charging will never be allowed if this bit is cleared. A

change in BATTERY_PRESENT will activate the LTC4100

SMBALERT pull-down.

AC_PRESENT is set if the voltage on DCDIV is greater than

VACP. This does not necessarily indicate that the voltage on

DCIN is sufficient to charge the battery. A change in

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