Texas Instruments bq27500 4.1 DATA COMMANDS 4.1.1 STANDARD DATA COMMANDS

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4.1 DATA COMMANDS4.1.1 STANDARD DATA COMMANDS

bq27500

bq27501System-Side Impedance Track™ Fuel Gauge

SLUS785 – SEPTEMBER 2007

The bq27500/1 uses a series of 2-byte standard commands to enable system reading and writing ofbattery information. Each standard command has an associated command-code pair, as indicated inTable 4-1 . Because each command consists of two bytes of data, two consecutive I

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C transmissions mustbe executed both to initiate the command function, and to read or write the corresponding two bytes ofdata. Additional options for transferring data, such as spooling, are described in Section 7.1 I

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CINTERFACE. Standard commands are accessible in NORMAL operation. Read/Write permissions dependon the active access mode, SEALED or UNSEALED (for details on the SEALED and UNSEALED states,see Section 4.4 Access Modes).

Table 4-1. Standard Commands

COMMAND SEALED UNSEALEDNAME UNITSCODE ACCESS ACCESS

Control( ) CNTL 0x00 / 0x01 N/A R/W R/W

AtRate( ) AR 0x02 / 0x03 mA R/W R/W

AtRateTimeToEmpty( ) ARTTE 0x04 / 0x05 Minutes R R

Temperature( ) TEMP 0x06 / 0x07 0.1 °K R R

Voltage( ) VOLT 0x08 / 0x09 mV R R

Flags( ) FLAGS 0x0a / 0x0b N/A R R

NominalAvailableCapacity( ) NAC 0x0c / 0x0d mAh R R

FullAvailableCapacity( ) FAC 0x0e / 0x0f mAh R R

RemainingCapacity( ) RM 0x10 / 0x11 mAh R R

FullChargeCapacity( ) FCC 0x12 / 0x13 mAh R R

AverageCurrent( ) AI 0x14 / 0x15 mA R R

TimeToEmpty( ) TTE 0x16 / 0x17 Minutes R R

TimeToFull( ) TTF 0x18 / 0x19 Minutes R R

StandbyCurrent( ) SI 0x1a / 0x1b mA R R

StandbyTimeToEmpty( ) STTE 0x1c / 0x1d Minutes R R

MaxLoadCurrent( ) MLI 0x1e / 0x1f mA R R

MaxLoadTimeToEmpty( ) MLTTE 0x20 / 0x21 Minutes R R

AvailableEnergy( ) AE 0x22 / 0x23 10mWhr R R

AveragePower( ) AP 0x24 / 0x25 10mW R R

TimeToEmptyAtConstantPower( ) TTECP 0x26 / 0x27 Minutes R R

Reserved RSVD 0x28 / 0x29 N/A R R

CycleCount( ) CC 0x2a / 0x2b Counts R R

StateOfCharge( ) SOC 0x2c / 0x2d % R R

Submit Documentation Feedback GENERAL DESCRIPTION 9

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