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Texas Instruments bq27500 Figure 5-1. BAT_GD Pin Operation, Based Upon Battery Presence and bq27500 Operating Mode

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Start

Init

(“BAT_GD”

disabled,OCV

taken,“BAT_GD

enabled.)

End

NoBattPresent

-OR-badbatt

(“BAT_GD”

disabled)

BattPresent

SLEEP

NORMAL

Yes

BatteryVolt

Sufficient

toFG?

Yes

Batt

removed?

Yes

Batt

detected?

Bq27500POR

Batt

detected?

Yes

ACorUSB

Present?

Yes

ITOperations

(dsg,chg, rlx)

Batt

removed?

Yes

Icc>

Istandby-OR-

Tr>30min

Yes

Forced

SLEEP

Mode?

Badbatt

detected?

Yes

Badbatt

detected?

Yes

bq27500

bq27501System-Side Impedance Track™ Fuel Gauge

SLUS785 – SEPTEMBER 2007

Figure 5-1. BAT_GD Pin Operation, Based Upon Battery Presence and bq27500 Operating Mode

Submit Documentation Feedback FUNCTIONAL DESCRIPTION 25

Contents

Main 1 INTRODUCTION 1.1 FEATURES 1.2 APPLICATIONS 1.3 DESCRIPTION bq27501System-Side Impedance Track Fuel Gauge bq27500 bq27501 2 DEVICE INFORMATION 2.1 AVAILABLE OPTIONS 2.3 TERMINAL FUNCTIONS 2.2 PIN DIAGRAMS 3 ELECTRICAL SPECIFICATIONS 3.1 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) 3.3 POWER-ON RESET 3.2 RECOMMENDED OPERATING CONDITIONS bq27500 bq27501System-Side Impedance Track Fuel Gauge 3.9 DATA FLASH MEMORY CHARACTERISTICS C-COMPATIBLE INTERFACE COMMUNICATION TIMING CHARACTERISTICS 3.10 I ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS (continued) Page 4 GENERAL DESCRIPTION 4.1 DATA COMMANDS 4.1.1 STANDARD DATA COMMANDS Page Page Page Page 4.1.2 EXTENDED DATA COMMANDS Page 4.2 DATA FLASH INTERFACE 4.2.1 ACCESSING THE DATA FLASH 4.3 MANUFACTURER INFORMATION BLOCKS 4.4 ACCESS MODES 4.5 SEALING/UNSEALING DATA FLASH 4.6 DATA FLASH SUMMARY GENERAL DESCRIPTION18 Submit Documentation Feedback Table 4-7. Data Flash Summary (continued) 5 FUNCTIONAL DESCRIPTION 5.1 FUEL GAUGING 5.2 IMPEDANCE TRACK VARIABLES Table 5-1. Constant-Current Model Used When Load Mode = 0 Page Page Page Figure 5-1. BAT_GD Pin Operation, Based Upon Battery Presence and bq27500 Operating Mode Submit Documentation Feedback FUNCTIONAL DESCRIPTION 25 Page bq27500 bq27501System-Side Impedance Track Fuel Gauge 5.7.4 HIBERNATE MODE FUNCTIONAL DESCRIPTION28 Submit Documentation Feedback C command to the gauge. I 5.8 POWER CONTROL 5.8.1 RESET FUNCTIONS Submit Documentation Feedback FUNCTIONAL DESCRIPTION 29 Figure 5-3. Partial Reset Flow Diagram 5.8.2 WAKE-UP COMPARATOR 5.8.3 FLASH UPDATES 5.9 AUTOCALIBRATION 6 APPLICATION-SPECIFIC INFORMATION Page 7 COMMUNICATIONS 7.1 I C INTERFACE Page PACKAGING INFORMATION PACKAGE OPTION ADDENDUM Page Page Page IMPORTANT NOTICE