BQ27505-J2 Datasheet, PDF (2/42 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27505-J2
System-Side Impedance Track™ Fuel Gauge
SLUS924 – APRIL 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.
Contents
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
2.1 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
............................................................. 35
7.1 I²C INTERFACE..................................... 35
7.2 I²C Time Out ........................................ 36
7.3 I²C Command Waiting Time ........................ 36
8 REFERENCE SCHEMATICS .......................... 37
8.1 SCHEMATIC ........................................ 37
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Contents
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