BQ2010 datasheet(12/26 Pages) TI2

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The valid discharge flag (VDQ) is asserted when the

bq2010 is discharged from NAC=LMD. The flag remains

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 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) is

used to warn that battery power is at a failure condition.

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 EDVF. The host system may pull EMPTY

high, which may be used to disable circuitry to prevent

deep-discharge of the battery.

The EDVF values are:

Where EDVF is:

Valid charge action detected, VSB ≥ 0.95V

1VSB < 0.95V providing that OVLD=0 (see

FLGS2 register description)

Temperature and Gas Gauge Register

(TMPGG)

The read-only TMPGG register (address=02h) contains

two data fields. The first field contains the battery tem-

perature. The second field contains the available charge

from the battery.

The bq2010 contains an internal temperature sensor.

The temperature is used to set charge and discharge ef-

ficiency factors as well as to adjust the self-discharge co-

efficient.

The temperature register contents may be translated as

shown below.

bq2010

TMPGG Temperature Bits

3210

TMP3

TMP2

TMP1

TMP0

TMP3

TMP2

TMP1

TMP0

Temperature

0000

T < -30°C

0001

-30°C < T < -20°C

0010

-20°C < T < -10°C

0011

-10°C < T < 0°C

0100

0°C < T < 10°C

0101

10°C < T < 20°C

0110

20°C < T < 30°C

0111

30°C < T < 40°C

1000

40°C < T < 50°C

1001

50°C < T < 60°C

1010

60°C < T < 70°C

1011

70°C < T < 80°C

1100

T > 80°C

FLGS1 Bits

EDVF

FLGS1 Bits

EDV1

FLGS1 Bits

VDQ

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