BQ27505 Datasheet, PDF (2/42 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27505
Not Recommended for New Designs
SLUS884 – FEBRUARY 2009
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 DISSIPATION RATINGS ............................ 3
2.3 PIN ASSIGNMENT .................................. 4
3 ELECTRICAL SPECIFICATIONS ..................... 5
3.1 ABSOLUTE MAXIMUM RATINGS .................. 5
3.2 RECOMMENDED OPERATING CONDITIONS ..... 5
3.3 POWER-ON RESET ................................. 6
3.4 INTERNAL TEMPERATURE SENSOR
CHARACTERISTICS ................................ 6
3.5 HIGH-FREQUENCY OSCILLATOR ................. 6
3.6 LOW-FREQUENCY OSCILLATOR .................. 6
3.7 INTEGRATING ADC (COULOMB COUNTER)
CHARACTERISTICS ................................ 6
3.8 ADC (TEMPERATURE AND CELL
MEASUREMENT) CHARACTERISTICS ............ 7
3.9 DATA FLASH MEMORY CHARACTERISTICS ..... 7
3.10 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 BLOCKS ...... 20
4.4 ACCESS MODES .................................. 21
4.5 SEALING/UNSEALING DATA FLASH ............. 21
4.6 DATA FLASH SUMMARY .......................... 21
5 FUNCTIONAL DESCRIPTION ........................ 23
5.1 FUEL GAUGING ................................... 23
5.2 IMPEDANCE TRACK™ VARIABLES .............. 24
5.3 DETAILED PIN DESCRIPTION .................... 26
5.4 TEMPERATURE MEASUREMENT ................ 30
5.5 OVERTEMPERATURE INDICATION .............. 30
5.6 CHARGING AND CHARGE-TERMINATION
INDICATION ........................................ 30
5.7 POWER MODES ................................... 31
5.8 POWER CONTROL ................................ 32
5.9 AUTOCALIBRATION ............................... 33
6 APPLICATION-SPECIFIC INFORMATION ......... 33
6.1 BATTERY PROFILE STORAGE AND SELECTION
...................................................... 33
6.2 APPLICATION-SPECIFIC FLOW AND CONTROL
...................................................... 34
7 COMMUNICATIONS
7.1 I²C INTERFACE
7.2 I²C Time Out
7.3 I²C Command Waiting time
7.4 PACKAGE INFORMATION
8 REFERENCE SCHEMATICS
8.1 SCHEMATIC
2
Contents
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