LTC4100 datasheet(12/24 Pages) LINER

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LTC4100

sn4100 4100is

OPERATIO

AC_PRESENT will activate the LTC4100 SMBALERT pull-

down.

ChargingCurrent() ('h14)

Description: The Battery, System Host or other master

device sends the desired charging current (mA) to the

LTC4100 .

Purpose: The LTC4100 uses RILIM, the granularity of the

IDAC, and the value of the ChargingCurrent() function to

determine its charging current supplied to the battery. The

charging current will never exceed the maximum current

permitted by RILIM. The ChargingCurrent() value will be

truncated to the granularity of the IDAC. The charging

current will also be reduced if the battery voltage exceeds

the programmed charging voltage.

• SMBus Protocol: Write Word.

Input: The CHARGING_CURRENT is an unsigned 16 bit

integer specifying the requested charging current in mA.

The following table defines the maximum permissible

value of CHARGING_CURRENT that will not set the

CURRENT_OR in the ChargerStatus() function for a given

value of the RILIM:

RILIM

ChargingCurrent()

Current

Short to GND

0x0000 through 0x03FF 0mA through 1023mA

10k

Ω ±1%

0x0000 through 0x07FF 0mA through 2047mA

33k

Ω ±1%

0x0000 through 0x0BFF 0mA through 3071mA

Open (or short to VDD) 0x0000 through 0x0FFF 0mA through 4095mA

ChargingVoltage() ('h15)

Description: The Battery, SMBus Host or other master

device sends the desired charging voltage (mV) to the

LTC4100.

Purpose: The LTC4100 uses RVLIM, the granularity of the

VDAC, and the value of the ChargingVoltage() function to

determine its charging voltage supplied to the battery. The

charging voltage will never be forced beyond the voltage

permitted by RVLIM. The ChargingVoltage() value will be

truncated to the granularity of the VDAC. The charging

voltage will also be reduced if the battery current exceeds

the programmed charging current.

• SMBus Protocol: Write Word.

Input: The CHARGING_VOLTAGE is an unsigned 16-bit

integer specifying the requested charging voltage in mV.

The LTC4100 considers any value from 0x0001 through

0x049F the same as writing 0x0000. The following

table defines the maximum permissible value of

CHARGING_VOLTAGE that will not set the VOLTAGE_OR

in the ChargerStatus() function for a given value of RVLIM:

RVLIM

Maximum ChargingVoltage()

Short to GND

0x225F (8796mV)

10k

Ω ±1%

0x332F (13100mV)

33k

Ω ±1%

0x43FF (17404mV)

100k

Ω ±1%

0x54CF (21708mV)

Open (or short to VDD)

0x6D5F (27999mV)

AlarmWarning() ('h16)

Description: The Smart Battery, acting as a bus master

device, sends the AlarmWarning() message to the LTC4100

to notify it that one or more alarm conditions exist. Alarm

indications are encoded as bit fields in the Battery’s Status

tion.

Purpose: The LTC4100 will use the information sent by

this function to properly charge the battery. The LTC4100

will only respond to certain alarm bits. Writing to this

function does not necessarily cause an alarm condition

that inhibits battery charging.

• SMBus Protocol: Write Word.

Input: Only the OVER_CHARGED_ALARM, TERMINATE

_CHARGE_ALARM,reserved (0x2000), and OVER

_TEMP_ALARM bits are supported by the LTC4100.

Writing a one to any of these specified bits will inhibit

the charging by the LTC4100 and will set the

ALARM_INHIBITED bit in the ChargerStatus() function. The

TERMINATE_DISCHARGE_ALARM, REMAINING_

CAPACITY_ALARM, REMAINING_TIME_ALARM, and the

ERROR bits are ignored by the LTC4100.

LTC0() ('h3C)

Description: The SMBus Host uses this command to

determine the version number of the LTC4100 and set

extended operation modes not defined by the Smart

Battery Charger Specification.

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