Datasheet

4.1 DATA COMMANDS

4.1.1 STANDARD DATA COMMANDS

bq27500

bq27501

System-Side Impedance Track™ Fuel Gauge

www.ti.com

SLUS785D – SEPTEMBER 2007 – REVISED APRIL 2008

The bq27500/1 uses a series of 2-byte standard commands to enable system reading and writing of

battery information. Each standard command has an associated command-code pair, as indicated in

Table 4-1 . Because each command consists of two bytes of data, two consecutive I

C transmissions must

be executed both to initiate the command function, and to read or write the corresponding two bytes of

data. Additional options for transferring data, such as spooling, are described in Section 7 , I

C Interface.

Standard commands are accessible in NORMAL operation. Read/write permissions depend on 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

NAME COMMAND CODE UNITS SEALED ACCESS UNSEALED 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/W

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

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

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

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

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

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

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

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

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

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

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

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

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

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

AvailableEnergy( ) AE 0x22 / 0x23 mWh R R/W

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

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

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

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

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

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