Marine Instruments User Manual

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Contents
bq27500
bq27501
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 in
conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
1 INTRODUCTION .......................................... 1 4.2 DATA FLASH INTERFACE ......................... 16
1.1 FEATURES ........................................... 1 4.3 MANUFACTURER INFORMATION BLOCKS ...... 17
1.2 APPLICATIONS ...................................... 1 4.4 ACCESS MODES ................................... 17
1.3 DESCRIPTION ....................................... 1 4.5 SEALING/UNSEALING DATA FLASH .............. 17
2 DEVICE INFORMATION ................................. 3 4.6 DATA FLASH SUMMARY ........................... 18
2.1 AVAILABLE OPTIONS ............................... 3 5 FUNCTIONAL DESCRIPTION ........................ 20
2.2 PIN DIAGRAMS ...................................... 3 5.1 FUEL GAUGING .................................... 20
2.3 TERMINAL FUNCTIONS ............................. 3 5.2 IMPEDANCE TRACK™ VARIABLES ............... 21
3 ELECTRICAL SPECIFICATIONS ...................... 4 5.3 DETAILED DESCRIPTION OF DEDICATED PINS . 23
3.1 ABSOLUTE MAXIMUM RATINGS ................... 4 5.4 TEMPERATURE MEASUREMENT ................. 26
3.2 RECOMMENDED OPERATING CONDITIONS ...... 4 5.5 OVERTEMPERATURE INDICATION ............... 26
5.6 CHARGING AND CHARGE-TERMINATION
3.3 POWER-ON RESET .................................. 4
INDICATION ......................................... 26
3.4 INTERNAL TEMPERATURE SENSOR
CHARACTERISTICS ................................. 5 5.7 POWER MODES .................................... 27
3.5 HIGH FREQUENCY OSCILLATOR .................. 5 5.8 POWER CONTROL ................................. 29
3.6 LOW FREQUENCY OSCILLATOR ................... 5 5.9 AUTOCALIBRATION ................................ 30
3.7 INTEGRATING ADC (COULOMB COUNTER)
6 APPLICATION-SPECIFIC INFORMATION .......... 31
CHARACTERISTICS ................................. 5
6.1 BATTERY PROFILE STORAGE AND SELECTION 31
3.8 ADC (TEMPERATURE AND CELL
6.2 APPLICATION-SPECIFIC FLOW AND CONTROL . 31
MEASUREMENT) CHARACTERISTICS ............. 5
7 COMMUNICATIONS .................................... 33
3.9 DATA FLASH MEMORY CHARACTERISTICS ...... 6
7.1 I
2
C INTERFACE ..................................... 33
3.10 I
2
C-COMPATIBLE INTERFACE COMMUNICATION
8 REFERENCE SCHEMATICS .......................... 34
TIMING CHARACTERISTICS ........................ 6
8.1 SCHEMATIC ........................................ 34
4 GENERAL DESCRIPTION .............................. 8
4.1 DATA COMMANDS .................................. 9
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