LTC1760_1 Datasheet, PDF(12/44 Page) Linear Technology – Dual Smart Battery System Manager

TABLE OF CO TE TS (For Operation Section)

1 Overview .............................................................................................................................................................................................. 13

2 The SMBus Interface ........................................................................................................................................................................... 13

2.1 SMBus Interface Overview ............................................................................................................................................................... 13

2.2 Data Bit Definition of Supported SMBus Functions. ......................................................................................................................... 14

2.3 Description of Supported SMBus Functions .................................................................................................................................... 16

2.3.1 BatterySystemState() ('h01) ........................................................................................................................................................ 16

2.3.2 BatterySystemStateCont() ('h02) ................................................................................................................................................. 17

2.3.3 BatterySystemInfo() ('h04) .......................................................................................................................................................... 18

2.3.4 LTC() ('h3c) ................................................................................................................................................................................. 19

2.3.5 BatteryMode() ('h03) ................................................................................................................................................................... 19

2.3.6 Voltage() ('h09) ........................................................................................................................................................................... 19

2.3.7 Current() ('h0a) ............................................................................................................................................................................ 20

2.3.8 ChargingCurrent() ('h14) ............................................................................................................................................................. 20

2.3.9 ChargingVoltage() ('h15) ............................................................................................................................................................. 20

2.3.10 AlarmWarning() ('h16) ................................................................................................................................................................ 20

2.3.11 AlertResponse() ........................................................................................................................................................................... 21

2.4 SMBus Dual Port Operation ............................................................................................................................................................. 21

2.5 LTC1760 SMBus Controller Operation ............................................................................................................................................. 22

2.6 LTC1760 SMBALERT Operation ...................................................................................................................................................... 24

3 Charging Algorithm Overview .............................................................................................................................................................. 24

3.1 Wake-Up Charging Initiation ............................................................................................................................................................ 24

3.2 Wake-Up Charging Termination ....................................................................................................................................................... 24

3.3 Wake-Up Charging Current and Voltage Limits ............................................................................................................................... 25

3.4 Controlled Charging Initiation .......................................................................................................................................................... 25

3.5 Controlled Charging Termination ..................................................................................................................................................... 25

3.6 Controlled Charging Current and Voltage Programming .................................................................................................................. 26

4 System Power Management Algorithm and Battery Calibration .......................................................................................................... 27

4.1 Turning Off System Power ............................................................................................................................................................... 27

4.2 Power-By Algorithm When No Battery is Being Calibrated .............................................................................................................. 27

4.3 Power-By Algorithm When a Battery is Being Calibrated ................................................................................................................. 27

4.4 Power-By Reporting ........................................................................................................................................................................ 27

5 Battery Calibration (Conditioning) ....................................................................................................................................................... 28

5.1 Selecting a Battery to be Calibrated ................................................................................................................................................. 28

5.2 Initiating Calibration of Selected Battery .......................................................................................................................................... 28

5.3 Terminating Calibration of Selected Battery ..................................................................................................................................... 28

6 MODE Pin Operation ............................................................................................................................................................................ 29

6.1 Stand Alone Charge Indication ......................................................................................................................................................... 29

6.2 Hardware Charge Inhibit .................................................................................................................................................................. 29

6.3 Charging When SCL and SDA are Low ............................................................................................................................................ 29

6.4 Charging With an SMBus Host ........................................................................................................................................................ 29

7 Battery Charger Controller ................................................................................................................................................................... 29

7.1 Charge MUX Switches ..................................................................................................................................................................... 30

7.2 Dual Charging .................................................................................................................................................................................. 30

8 PowerPath Controller .......................................................................................................................................................................... 31

8.1 Autonomous PowerPath Switching ................................................................................................................................................. 31

8.2 Short-Circuit Protection ................................................................................................................................................................... 31

8.3 Emergency Turn-Off ........................................................................................................................................................................ 32

8.4 Power-Up Strategy .......................................................................................................................................................................... 32

9 The Voltage DAC Block ........................................................................................................................................................................ 32

10 The Current DAC Block ........................................................................................................................................................................ 32