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IF_CHECKSUM: 0x0022

This command instructs the fuel gauge to compute the instruction flash checksum. When the checksum has

been calculated and stored, then CONTROL_STATUS [CVS] is set. In UNSEALED mode, the checksum value is

returned to addresses 0x00/0x01. The checksum will not be calculated in SEALED mode; however, the

checksum value can still be read.

CAL_MODE: 0x0040

This command instructs the fuel gauge to enter calibration mode. This command is only available when the fuel

gauge is UNSEALED.

RESET : 0x0041

This command instructs the fuel gauge to perform a full reset. This command is only available when the fuel

gauge is UNSEALED.

AtRate( ): 0x02/0x03

The AtRate( ) read-/write-word function is the first half of a two-function command set used to set the AtRate

value used in calculations made by the AtRateTimeToEmpty( ) function. The AtRate( ) units are in mA.

The AtRate( ) value is a signed integer, with negative values interpreted as a discharge current value. The

AtRateTimeToEmpty( ) function returns the predicted operating time at the AtRate value of discharge. The

default value for AtRate( ) is zero and will force AtRate( ) to return 65,535. Both the AtRate( ) and

AtRateTimeToEmpty( ) commands should only be used in NORMAL mode.

AtRateTimeToEmpty( ): 0x04/0x05

This read-word function returns an unsigned integer value of the predicted remaining operating time if the battery

is discharged at the AtRate( ) value in minutes with a range of 0 to 65,534. A value of 65,535 indicates AtRate( )

= 0. The fuel gauge updates AtRateTimeToEmpty( ) within 1 s after the system sets the AtRate( ) value. The fuel

gauge automatically updates AtRateTimeToEmpty( ) based on the AtRate( ) value every 1s. Both the AtRate( )

and AtRateTimeToEmpty( ) commands should only be used in NORMAL mode.

Temperature( ): 0x06/0x07

This read-word function returns an unsigned integer value of the battery temperature in units of 0.1K measured

by the fuel gauge.

Voltage( ): 0x08/0x09

This read-word function returns an unsigned integer value of the measured cell-pack voltage in mV with a range

of 0 to 6000 mV.

Flags( ): 0x0a/0x0b

This read-word function returns the contents of the gas-gauge status register, depicting the current operating

status.

Table 4. Flags Bit Definitions

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

High Byte

OTC

OTD

–

–

CHG_INH

XCHG

FC

CHG

Low Byte

–

–

OCV_GD

WAIT_ID

BAT_DET

SOC1

SOCF

DSG

OTC = Over-Temperature in charge condition is detected. True when set.

OTD = Over-Temperature in discharge condition is detected. True when set.

CHG_INH = Charge Inhibit: unable to begin charging (temp outside the range [Charge Inhibit Temp Low, Charge Inhibit Temp High]).

True when set.

Charge Suspend Alert (temp outside the range [Suspend Temperature Low, Suspend Temperature High]). True when

XCHG =

set.

FC = Full-charged condition reached. True when set.

Copyright © 2008, Texas Instruments Incorporated

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