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LTC1760

1760fa

CHARGE_BAT[4:1] Nibble

The read only CHARGE_BAT[4:1]nibble is used by the

SMBus Host to determine which, if any, battery is being

charged. All writes to this nibble will be ignored.

Allowed values are:

0011b: Both Battery 2 and Battery 1 being charged.

0010b: Only Battery 2 is being charged.

0001b: Only Battery 1 is being charged.

0000b: No battery being charged.

An indication that multiple batteries are being charged

simultaneously does not indicate that the batteries are

being charged at the same rate or that they will complete

their charge at the same time. To actually determine

when an individual battery will be fully charged, use the

SMB_BAT[4:1] nibble to individually select the battery of

interest and read the TimeToFull() value.

PRESENT_BAT[4:1] Nibble

The read only PRESENT_BAT[4:1]nibble is used by the

SMBus Host to determine how many and which batteries

are present. All writes to this nibble will be ignored.

Allowed values are:

0011b: Both Battery 2 and Battery 1 are present.

0010b: Only Battery 2 is present.

0001b: Only Battery 1 is present.

0000b: No batteries are present.

2.3.2 BatterySystemStateCont() (0

×02)

Description:

This function returns additional state information of the

LTC1760 and provides a mechanism to prohibit charging.

This command also removes any requirement for the

SMBus Host to communicate directly with the charger to

obtain AC presence information. When the LTC1760 is used,

access to the charger 8-bit address, 0

×012, is blocked.

Purpose:

Used by the SMBus Host to retrieve additional state

information from the LTC1760 and the overall system

power configuration. It may also be used by the system

to prohibit any battery charging.

SMBus Protocol: Read or Write Word.

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

mapping

AC_PRESENT Bit

The read only AC_PRESENT bit is used to show the user

the status of AC availability to power the system. It may

be used internally by the SMBus Host in conjunction with

other information to determine when it is appropriate to

allow a battery conditioning cycle. Whenever there is a

change in the AC status, the LTC1760 asserts SMBALERT

low. In response, the system has to read this register to

determine the actual presence of AC. The LTC1760 uses

the DCDIV pin to measure the presence of AC.

Allowed values are:

1b: The LTC1760 has determined that AC is present.

0b: The LTC1760 has determined that AC is not present.

POWER_NOT_GOOD Bit

The read only POWER_NOT_GOOD bit is used to show

that the voltage delivered to the system load is inadequate.

This is determined by the LOPWR comparator.

The POWER_NOT_GOOD bit will also be set if the LTC1760

has detected a short circuit condition (see “Section 8.2”)

or an emergency turn-off condition (see “Section 8.3”).

Under either of these conditions the power paths will be

shut off even if battery or DC power is available.

Allowed values are:

1b: The LTC1760 has determined that the voltage

delivered to the system load is inadequate.

0b: The LTC1760 has determined that the voltage

delivered to the system load is adequate.

CALIBRATE_REQUEST_SUPPORT Bit

The read only CALIBRATE_REQUEST_SUPPORT bit is

always set high to indicate that the LTC1760 has a mecha-

nism to determine when any of the attached batteries are

in need of a calibration cycle.

OPERATION

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