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bq27500bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed inconductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
1 INTRODUCTION .......................................... 14.2 DATA FLASH INTERFACE ......................... 16
1.1 FEATURES ........................................... 14.3 MANUFACTURER INFORMATION BLOCKS ...... 17
1.2 APPLICATIONS ...................................... 14.4 ACCESS MODES ................................... 17
1.3 DESCRIPTION ....................................... 14.5 SEALING/UNSEALING DATA FLASH .............. 17
2 DEVICE INFORMATION ................................. 34.6 DATA FLASH SUMMARY ........................... 18
2.1 AVAILABLE OPTIONS ............................... 35 FUNCTIONAL DESCRIPTION ........................ 20
2.2 PIN DIAGRAMS ...................................... 35.1 FUEL GAUGING .................................... 20
2.3 TERMINAL FUNCTIONS ............................. 35.2 IMPEDANCE TRACK™ VARIABLES ............... 21
3 ELECTRICAL SPECIFICATIONS ...................... 45.3 DETAILED DESCRIPTION OF DEDICATED PINS .23
3.1 ABSOLUTE MAXIMUM RATINGS ................... 45.4 TEMPERATURE MEASUREMENT ................. 26
3.2 RECOMMENDED OPERATING CONDITIONS ...... 45.5 OVERTEMPERATURE INDICATION ............... 26
5.6 CHARGING AND CHARGE-TERMINATION3.3 POWER-ON RESET .................................. 4
INDICATION ......................................... 263.4 INTERNAL TEMPERATURE SENSORCHARACTERISTICS ................................. 55.7 POWER MODES .................................... 27
3.5 HIGH FREQUENCY OSCILLATOR .................. 55.8 POWER CONTROL ................................. 29
3.6 LOW FREQUENCY OSCILLATOR ................... 55.9 AUTOCALIBRATION ................................ 30
3.7 INTEGRATING ADC (COULOMB COUNTER)
6 APPLICATION-SPECIFIC INFORMATION .......... 31CHARACTERISTICS ................................. 5
6.1 BATTERY PROFILE STORAGE AND SELECTION 313.8 ADC (TEMPERATURE AND CELL
6.2 APPLICATION-SPECIFIC FLOW AND CONTROL .31MEASUREMENT) CHARACTERISTICS ............. 5
7 COMMUNICATIONS .................................... 333.9 DATA FLASH MEMORY CHARACTERISTICS ...... 6
7.1 I
2
C INTERFACE ..................................... 333.10 I
2
C-COMPATIBLE INTERFACE COMMUNICATION
8 REFERENCE SCHEMATICS .......................... 34TIMING CHARACTERISTICS ........................ 6
8.1 SCHEMATIC ........................................ 344 GENERAL DESCRIPTION .............................. 8
4.1 DATA COMMANDS .................................. 9
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