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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

..................................... 33

3.10

8

REFERENCE SCHEMATICS

.......................... 34

TIMING CHARACTERISTICS

........................ 6

8.1

SCHEMATIC

........................................ 34

4

GENERAL DESCRIPTION

.............................. 8

4.1

DATA COMMANDS

.................................. 9

2

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