LTC4101EG Просмотр технического описания (PDF) - Linear Technology

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LTC4101EG

Smart Battery Charger Controller

Linear Technology 

LTC4101

OPERATION

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 LTC4101’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 LTC4101

supports Version 1.1 of the Smart Battery Charger

Specification. The SELECTOR_SUPPORT indicates that

the LTC4101 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 LTC4101 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 LTC4101.

Values written to this bit are ignored.

The POR_RESET bit sets the LTC4101 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 LTC4101’s status bits.

Purpose: Allows the SMBus Host to determine the status

and level of the LTC4101.

• SMBus Protocol: Read Word.

Output: The CHARGE_INHIBITED bit reflects the status

of the LTC4101 set by the INHIBIT_CHARGE bit in the

ChargerMode() function.

The POLLING_ENABLED, VOLTAGE_NOTREG, and CUR-

RENT_NOTREG are not supported by the LTC4101.

The LTC4101 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

LTC4101. This bit may be used in conjunction with the

INHIBIT_CHARGE bit of the ChargerMode() and Charg-

ingCurrent() to determine the current capability of the

LTC4101. When ChargingCurrent() is set to 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

LTC4101. This bit may be used in conjunction with the

INHIBIT_CHARGE bit of the ChargerMode() and Charg-

ingVoltage() to determine the voltage capability of the

LTC4101. 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.

The RES_COLD bit is set only when the SafetySignal re-

sistance value is greater than 28.5kΩ. 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 3150Ω, which indicates a hot battery.

The RES_HOT bit will be set whenever the RES_UR bit

is set.

4101fa

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