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LTC1759

The Charger Controller Block

The LTC1759 charger operations are handled by the

charger controller block. This block is capable of charging

the selected battery autonomously or under host control.

The charger controller can request communications with

the system management host (SMHost) by asserting

INTB = 0; this will cause the SMHost, if present, to poll the

LTC1759.

The charger controller receives SMBus slave commands

from the SMBus controller block.

The charge controller allows the LTC1759 to meet the

following Smart Battery-controlled (Level 2) charger

requirements:

1. Implements the Smart Battery’s critical warning mes-

sages over the SMBus.

2. Operates as an SMBus slave device that responds to

ChargingVoltage() and ChargingCurrent() commands

and adjusts the charger output characteristics

accordingly.

OPERATIO

The charger controller allows the LTC1759 to meet the

following host-controlled (Level 3) Smart Battery charger

requirements.

1. In a host-controlled system the host is able to operate

as an SMBus master device.

2. The host may determine the appropriate charging algo-

rithm by querying the battery or providing an alternative

special charging algorithm.

3. The host may control charging by disabling the Smart

Battery’s ability to transmit ChargingCurrent() and

ChargingVoltage() request functions and broadcasting

the charging commands to the LTC1759 over the SMBus.

4. The LTC1759 will still respond to Smart Battery critical

warning messages without host intervention.

The charger controller block uses the state machine of

Figure 3. The functional features for state transitions and

general control are detailed in Table 3.

8 OR 9

NOTE: NUMBERS REFER TO CONDITIONS AND STATE DESCRIPTION IN TABLE 3

3 OR 4 OR 5

OR 6 OR 16

1 OR 2

1759 F03

10 OR 11 OR 12

OR 13 OR 16

CHARGING_CONTROLLED_STATE

CHARGING_RESET_STATE

CHARGING_NONE_STATE

CHARGING_WAKE-UP_STATE

Figure 3. Charger Controller State Machine

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