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LTC1760

sn1760 1760is

OPERATIO

CALIBRATE_REQUEST Bit

The read only CALIBRATE_REQUEST bit is set whenever

the LTC1760 has determined that one or more of the

connected batteries need a calibration cycle.

Allowed values are:

'b1: The LTC1760 has determined that one or both

batteries requires calibration.

'b0: The LTC1760 has determined that no batteries

require calibration.

CHARGING_INHIBIT Bit

The read/write CHARGING_INHIBIT is used by the SMBus

Host to inhibit charging or to determine if charging is

inhibited. This bit is also set if MODE is used to inhibit

charging.

Allowed values are:

'b1: The LTC1760 must not allow any battery charging

to occur.

'b0: The LTC1760 may charge batteries as needed,

(Power On Reset Value).

CHARGER_POR Bit

The read/write CHARGER_POR bit is used to force a

charger power on reset.

Writing a 1 to this bit will cause a charger power on reset

with the following effects.

• Charging will be turned off and wake-up charging will

be resumed. This is the same as if the batteries were

removed and then reinserted.

• The three minute wake-up watchdog timer will be

restarted.

Writing a 0 to this bit has no effect.

A read of this bit always returns a 0.

CALIBRATE Bit

The read/write CALIBRATE bit is used either to show the

status of battery calibration cycles in the LTC1760 or to

begin or end a calibration cycle.

CALIBRATE_BAT[4:1] Nibble

The read/write CALIBRATE_BAT[4:1] nibble is used by the

SMBus Host to select the battery to be calibrated or to

determine which individual battery is being calibrated.

Allowed read values are:

'b0010: Battery 2 is being calibrated . CALIBRATE must

be 1.

'b0001: Battery 1 is being calibrated. CALIBRATE must

be 1.

'b0000: No batteries are being calibrated.

Allowed write values are:

'b0010: Select Battery 2 for calibration.

'b0001: Select Battery 1 for calibration.

'b0000: Allow LTC1760 to choose battery

to be calibrated.

All other values will simply be ignored. This provides a

mechanism to update the other BatterySystemStateCont()

bits without altering this nibble.

2.3.3 BatterySystemInfo ()('h04)

Description:

The SMBus Host uses this command to determine the

capabilities of the LTC1760.

Purpose:

Allows the SMBus Host to determine the number of

batteries the LTC1760 supports as well as the specifica-

tion revision implemented by the LTC1760.

SMBus Protocol: Read Word

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

mapping.

BATTERIES_SUPPORTED Nibble

The read only BATTERIES_SUPPORTED nibble is used by

the SMBus Host to determine how many batteries the

LTC1760 can support. The two-battery LTC1760 always

returns 'b0011 for this nibble.

LTC1760 Datasheet(PDF) 18 Page - Linear Technology

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