BQ27500 Datasheet, PDF (2/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
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 PIN DIAGRAMS ...................................... 3
2.3 TERMINAL FUNCTIONS ............................. 3
3 ELECTRICAL SPECIFICATIONS ...................... 4
3.1 ABSOLUTE MAXIMUM RATINGS ................... 4
3.2 RECOMMENDED OPERATING CONDITIONS...... 4
3.3 POWER-ON RESET.................................. 4
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 ............. 5
3.9 DATA FLASH MEMORY CHARACTERISTICS ...... 6
3.10 I²C-COMPATIBLE INTERFACE COMMUNICATION
TIMING CHARACTERISTICS ........................ 6
4 GENERAL DESCRIPTION .............................. 8
4.1 DATA COMMANDS .................................. 9
4.2 DATA FLASH INTERFACE ......................... 16
4.3 MANUFACTURER INFORMATION BLOCKS ...... 17
4.4 ACCESS MODES ................................... 17
4.5 SEALING/UNSEALING DATA FLASH .............. 17
4.6 DATA FLASH SUMMARY........................... 18
5 FUNCTIONAL DESCRIPTION ........................ 20
5.1 FUEL GAUGING .................................... 20
5.2 IMPEDANCE TRACK™ VARIABLES ............... 21
5.3 DETAILED DESCRIPTION OF DEDICATED PINS. 23
5.4 TEMPERATURE MEASUREMENT ................. 26
5.5 OVERTEMPERATURE INDICATION ............... 26
5.6 CHARGING AND CHARGE-TERMINATION
INDICATION......................................... 26
5.7 POWER MODES.................................... 27
5.8 POWER CONTROL................................. 29
5.9 AUTOCALIBRATION................................ 30
6 APPLICATION-SPECIFIC INFORMATION.......... 31
6.1 BATTERY PROFILE STORAGE AND SELECTION 31
6.2 APPLICATION-SPECIFIC FLOW AND CONTROL. 31
7 COMMUNICATIONS .................................... 33
7.1 I²C INTERFACE..................................... 33
8 REFERENCE SCHEMATICS .......................... 34
8.1 SCHEMATIC ........................................ 34
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Contents
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