LTC4100 datasheet(19/48 Pages) LINER

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LTC1760

1760fa

OPERATION

CALIBRATE_REQUEST Bit

The read only CALIBRATE_REQUEST bit is set whenever

the LTC1760 has determined that one or both of the con-

nected batteries need a calibration cycle.

Allowed values are:

1b: The LTC1760 has determined that one or both

batteries requires calibration.

0b: The LTC1760 has determined that neither battery

require calibration.

CHARGING_INHIBIT Bit

The read/write CHARGING_INHIBIT bit is used by the

SMBus Host to inhibit charging or to determine if charging

is inhibited. This bit is also set if the MODE pin is used to

inhibit charging.

Allowed values are:

1b: The LTC1760 will not allow any battery charging

to occur.

0b: 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 char-

ger 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:

0010b: Battery 2 is being calibrated. CALIBRATE must

be 1.

0001b: Battery 1 is being calibrated. CALIBRATE must

be 1.

0000b: No batteries are being calibrated.

Allowed write values are:

0010b: Select Battery 2 for calibration.

0001b: Select Battery 1 for calibration.

0000b: 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() (0

×04)

Description:

The SMBus Host uses this function to determine the

capabilities of the LTC1760.

Purpose:

Allows the SMBus Host to determine the number of bat-

teries the LTC1760 supports as well as the specification

revision implemented by the LTC1760.

SMBus Protocol: Read Word

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

ping.

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 0011b for this nibble.

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