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LTC1760

1760fa

2.3.7 Current() (0

×0A)

Description:

This function is used by the LTC1760 to read the actual

current being supplied through the battery terminals.

Purpose:

Allows the LTC1760 to determine how much current a

battery is receiving through its terminals and close the

charging current servo loop.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Output: signed integer (2’s complement) — charge/dis-

charge rate in mA increments - positive for charge, nega-

tive for discharge. Refer to “Section 2.2” for bit mapping.

Units: mA.

Range: 0 to 32,767 mA for charge or 0 to -32,768 mA

for discharge.

2.3.8 ChargingCurrent() (0

×14)

Description:

This function is used by the LTC1760 to read the Smart

Battery’s desired charging current.

Purpose:

Allows the LTC1760 to determine the maximum charging

current.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Output: unsigned integer — maximum charger output

current in mA. Refer to “Section 2.2” for bit mapping.

Units: mA.

Range: 0 to 65,534 mA.

2.3.9 ChargingVoltage() (0

×15)

Description:

This function is used by the LTC1760 to read the Smart

Battery’s desired charging voltage.

Purpose:

Allows the LTC1760 to determine the maximum charging

voltage.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Output: unsigned integer — charger output voltage in mV.

Refer to “Section 2.2” for bit mapping.

Units: mV.

Range: 0 to 65,534 mV.

2.3.10 AlarmWarning() (0

×16)

Description:

This function is used by the LTC1760 to read the Smart

Battery’s Alarm register.

Purpose:

Allows the LTC1760 to determine the state of all applicable

alarm flags.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Output: unsigned integer – Refer to “Section 2.2” for bit

mapping.

OVER_CHARGED_ALARM Bit

The read only OVER_CHARGED_ALARM bit is used by the

LTC1760 to determine if charging may continue.

Allowed values are:

1b: The LTC1760 will not charge this battery.

0b: The LTC1760 may charge this battery if other

conditions permit charging.

TERMINATE_CHARGE_ALARM Bit

The read only TERMINATE_CHARGE_ALARM bit is used

by the LTC1760 to determine if charging may continue.

Allowed values are:

1b: The LTC1760 will not charge this battery.

0b: The LTC1760 may charge this battery if other

conditions permit charging.

OPERATION

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