LLTC4100EG 데이터 시트보기 (PDF) - Linear Technology

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LLTC4100EG

Smart Battery Charger Controller

Linear Technology 

LTC4100

Operation

Description of Supported Battery Charger Functions

The functions are described as follows (see Table 1 also):

FunctionName() ‘hnn (command code)

Description: A brief description of the function.

Purpose: The purpose of the function, and an example

where appropriate.

• SMBus Protocol: Refer to Section 5 of the Smart

Battery Charger specification for more details.

Input, Output or Input/Output: A description of the data

supplied to or returned by the function.

ChargerSpecInfo() (‘h11)

Description: The SMBus Host uses this command to read

the LTC4100’s extended status bits.

Purpose: Allows the System Host to determine the

specification revision the charger supports as well as

other extended status information.

• SMBus Protocol: Read Word.

Output: The CHARGER_SPEC indicates that the LTC4100

supports Version 1.1 of the Smart Battery Charger

Specification. The SELECTOR_SUPPORT indicates that

the LTC4100 does not support the optional Smart Battery

Selector Commands.

ChargerMode() (‘h12)

Description: The SMBus Host uses this command to set

the various charger modes. The default values are set to

allow a Smart Battery and the LTC4100 to work in concert

without requiring an SMBus Host.

Purpose: Allows the SMBus Host to configure the charger

and change the default modes. This is a write only function,

but the value of the “mode” bit, INHIBIT_CHARGE may be

determined using the ChargerStatus() function.

• SMBus Protocol: Write Word.

Input: The INHIBIT_CHARGE bit allows charging to be

inhibited without changing the ChargingCurrent() and

ChargingVoltage() values. The charging may be resumed

by clearing this bit. This bit is automatically cleared when

power is reapplied or when a battery is reinserted.

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() values

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 ILIM

+ 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 VLIM,

the VOLTAGE_OR bit will be set.

The RES_OR bit is set only when the SafetySignal resis-

tance value is greater than 95kΩ. This indicates that the

SafetySignal is to be considered as an open circuit.

4100fc

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For more information www.linear.com/LTC4100

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