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LTC1760

1760fa

BATTERY_SYSTEM_REVISION Nibble

The read only BATTERY_SYSTEM_REVISION nibble re-

ports the version of the Smart Battery System Manager

specification supported.

LTC1760 always returns 1000b for this nibble, indicating

Version 1.0 without optional PEC support.

2.3.4 LTC() (0

×3C)

Description:

This function returns the LTC version nibble and allows

the user to perform expanded Smart Battery System

Manager functions.

Purpose:

Used by the SMBus Host to determine the version of

the LTC1760 and to program and monitor TURBO and

POWER_OFF special functions.

SMBus Protocol: Read or Write Word.

Input/Output: word — Refer to “Section 2.2” for bit map-

ping.

POWER_OFF Bit

This read/write bit allows the LTC1760 to turn off all power

paths.

Allowed values:

1b: All power paths are off.

0b: All power paths are enabled. (power on reset value).

TURBO Bit

This read/write bit allows the LTC1760 to enter TURBO

charging mode. Refer to “section 3.6”.

Allowed values:

1b: Turbo charging mode enabled.

0b: Turbo charging mode disabled. (Power On Reset

Value).

LTC_Version[3:0] Nibble

This read only nibble always returns 0001b as the LTC1760

version.

OPERATION

2.3.5 BatteryMode() (0

×03)

Description:

This function is used by the LTC1760 to read the battery’s

Mode register.

Purpose:

Allows the LTC1760 to determine if a battery requires a

conditioning/calibration cycle.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Input/Output: word — Refer to “Section 2.2” for bit map-

ping.

CONDITION_FLAG Bit

The CONDITION_FLAG bit is set whenever the battery

requires calibration.

Allowed values:

1b: Battery requires calibration. (Also known as a

Condition Cycle Request).

0b: Battery does not require calibration.

2.3.6 Voltage() (0

×09)

Description:

This function is used by the LTC1760 to read the actual

cell-pack voltage .

Purpose:

Allows the LTC1760 to determine the cell pack voltage and

close the charging voltage servo loop.

SMBus Protocol: Read Word. LTC1760 reads Battery 1 or

Battery 2 as an SMBus Master.

Output: unsigned integer — battery terminal voltage in

milli-volts. Refer to “Section 2.2” for bit mapping.

Units: mV.

Range: 0 to 65,535 mV.

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