BQ2012 datasheet(12/26 Pages) TI2

12 / 26 page

The battery removed flag (BRM) is asserted whenever

the potential on the SB pin (relative to VSS) rises above

MCV or falls below 0.1V. The BRM flag is asserted until

the condition causing BRM is removed.

The BRM values are:

Where BRM is:

0.1V < VSB < 2.25V

0.1 V > VSB or VSB > 2.25V

The capacity inaccurate flag (CI) is used to warn the

user that the battery has been charged a substantial

number of times since LMD has been updated. The CI

flag is asserted on the 64th charge after the last LMD

update or when the bq2012 is reset. The flag is cleared

after an LMD update.

The CI values are:

Where CI is:

When LMD is updated with a valid full dis-

charge

After the 64th valid charge action with no

LMD updates

The valid discharge flag (VDQ) is asserted when the

bq2012 is discharged from NAC = LMD. The flag re-

mains set until either LMD is updated or one of three

actions that can clear VDQ occurs:

The self-discharge count register (SDCR) has

exceeded the maximum acceptable value (4096

counts) for an LMD update.

A valid charge action sustained at VSRO >VSRQ for at

least 256 NAC counts.

The EDV1 flag was set at a temperature below 0°C

The VDQ values are:

Where VDQ is:

SDCR

≥ 4096, subsequent valid charge ac-

tion detected, or EDV1 is asserted with the

temperature less than 0°C

On first discharge after NAC = LMD

The charge control flag, CHG, is asserted whenever

the CHG pin is asserted (see the charge control section

on page 7 for a description of the CHG pin function).

The CHG values are:

Where CHG is:

When the CHG pin is asserted active low,

signifying that the bq2012 is in a state to

allow charge activity.

When the CHG pin is high-impedance, sig-

nifying that no charge activity should take

place.

The first end-of-discharge warning flag (EDV1)

warns the user that the battery is almost empty. The

first segment pin, SEG1, is modulated at a 4Hz rate if

the display is enabled once EDV1 is asserted, which

should warn the user that loss of battery power is immi-

nent. The EDV1 flag is latched until a valid charge has

been detected.

The EDV1 values are:

Where EDV1 is:

Valid charge action detected, VSB

≥ 1.05V

1VSB < 1.05V providing that OVLD=0 (see

FLGS2 register description)

The final end-of-discharge warning flag (EDVF) flag

is used to warn that battery power is at a failure condi-

tion. All segment drivers are turned off. The EDVF flag

is latched until a valid charge has been detected. The

EMPTY pin is also forced to a high-impedance state on

assertion of EDV1. The host system may pull EMPTY

high, which may be used to disable circuitry to prevent

deep-discharge of the battery.

bq2012

FLGS1 Bits

CHG

FLGS1 Bits

VDQ

FLGS1 Bits

EDV1

FLGS1 Bits

BRM

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