BQ27505-J4 Datasheet, PDF (2/38 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27505-J4
SLVSA40 – DECEMBER 2009
1 INTRODUCTION ......................................... 1
1.1 FEATURES .......................................... 1
1.2 APPLICATIONS ...................................... 1
1.3 DESCRIPTION ....................................... 1
2 DEVICE INFORMATION ................................ 3
2.1 AVAILABLE OPTIONS ............................... 3
2.2 DISSIPATION RATINGS ............................ 3
2.3 PIN ASSIGNMENT .................................. 3
3 ELECTRICAL SPECIFICATIONS ..................... 4
3.1 ABSOLUTE MAXIMUM RATINGS .................. 4
3.2 RECOMMENDED OPERATING CONDITIONS ..... 4
3.3 POWER-ON RESET ................................. 5
3.4 INTERNAL TEMPERATURE SENSOR
CHARACTERISTICS ................................ 5
3.5 HIGH-FREQUENCY OSCILLATOR ................. 5
3.6 LOW-FREQUENCY OSCILLATOR .................. 5
3.7 INTEGRATING ADC (COULOMB COUNTER)
CHARACTERISTICS ................................ 5
3.8 ADC (TEMPERATURE AND CELL
MEASUREMENT) CHARACTERISTICS ............ 6
3.9 DATA FLASH MEMORY CHARACTERISTICS ..... 6
3.10 400 kHz I²C-COMPATIBLE INTERFACE
COMMUNICATION TIMING CHARACTERISTICS
........................................................ 7
3.11 100 kHz I²C-COMPATIBLE INTERFACE
COMMUNICATION TIMING CHARACTERISTICS
........................................................ 7
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4 GENERAL DESCRIPTION ............................. 8
4.1 DATA COMMANDS .................................. 9
4.2 DATA FLASH INTERFACE ........................ 18
4.3 MANUFACTURER INFORMATION BLOCKS ...... 19
4.4 ACCESS MODES .................................. 19
4.5 SEALING/UNSEALING DATA FLASH ............. 19
4.6 DATA FLASH SUMMARY .......................... 20
5 FUNCTIONAL DESCRIPTION ........................ 22
5.1 FUEL GAUGING ................................... 22
5.2 IMPEDANCE TRACK™ VARIABLES .............. 23
5.3 DETAILED PIN DESCRIPTION .................... 25
5.4 TEMPERATURE MEASUREMENT ................ 28
5.5 OVERTEMPERATURE INDICATION .............. 29
5.6 CHARGING AND CHARGE-TERMINATION
INDICATION ........................................ 29
5.7 POWER MODES ................................... 29
5.8 POWER CONTROL ................................ 31
5.9 AUTOCALIBRATION ............................... 32
6 APPLICATION-SPECIFIC INFORMATION ......... 32
6.1 BATTERY PROFILE STORAGE AND SELECTION
...................................................... 32
6.2 APPLICATION-SPECIFIC FLOW AND CONTROL
...................................................... 33
7 COMMUNICATIONS ................................... 33
7.1 I²C INTERFACE .................................... 33
7.2 I²C Time Out ........................................ 34
8 REFERENCE SCHEMATICS ......................... 35
8.1 SCHEMATIC ........................................ 35
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