BQ27520-G3 Datasheet, PDF (2/47 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated LDO

bq27520-G3
SLUSAP0 – DECEMBER 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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 THERMAL INFORMATION .......................... 3
2.3 PIN ASSIGNMENT .................................. 3
3 ELECTRICAL SPECIFICATIONS ..................... 5
3.1 ABSOLUTE MAXIMUM RATINGS .................. 5
3.2 RECOMMENDED OPERATING CONDITIONS ..... 5
3.3 POWER-ON RESET ................................. 6
3.4 2.5V LDO REGULATOR ............................. 6
3.5 INTERNAL TEMPERATURE SENSOR
CHARACTERISTICS ................................ 6
3.6 HIGH-FREQUENCY OSCILLATOR ................. 6
3.7 LOW-FREQUENCY OSCILLATOR .................. 7
3.8 INTEGRATING ADC (COULOMB COUNTER)
CHARACTERISTICS ................................ 7
3.9 ADC (TEMPERATURE AND CELL
MEASUREMENT) CHARACTERISTICS ............ 7
3.10 DATA FLASH MEMORY CHARACTERISTICS ..... 8
3.11 I²C-COMPATIBLE INTERFACE COMMUNICATION
TIMING CHARACTERISTICS ....................... 8
4 GENERAL DESCRIPTION ............................. 9
4.1 DATA COMMANDS ................................ 10
4.2 DATA FLASH INTERFACE ........................ 19
4.3 MANUFACTURER INFORMATION BLOCK ....... 21
4.4 ACCESS MODES .................................. 21
4.5 SEALING/UNSEALING DATA FLASH ............. 21
4.6 DATA FLASH SUMMARY .......................... 22
5 FUNCTIONAL DESCRIPTION ........................ 25
5.1 FUEL GAUGING ................................... 25
5.2 IMPEDANCE TRACK™ VARIABLES .............. 26
5.3 DETAILED PIN DESCRIPTION .................... 28
5.4 TEMPERATURE MEASUREMENT ................ 33
5.5 OVERTEMPERATURE INDICATION .............. 33
5.6 CHARGING AND CHARGE-TERMINATION
INDICATION ........................................ 33
5.7 POWER MODES ................................... 34
5.8 POWER CONTROL ................................ 36
5.9 AUTOCALIBRATION ............................... 36
6 APPLICATION-SPECIFIC INFORMATION ......... 37
6.1 BATTERY PROFILE STORAGE AND SELECTION
...................................................... 37
7 COMMUNICATIONS ................................... 38
7.1 I²C INTERFACE .................................... 38
7.2 I²C Time Out ........................................ 39
7.3 I²C Command Waiting Time ........................ 39
7.4 I²C Clock Stretching ................................ 39
8 REFERENCE SCHEMATICS ......................... 41
8.1 SCHEMATIC ........................................ 41
8.2 Package Dimensions ............................... 42
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