BQ2011 datasheet(12/24 Pages) TI2

12 / 24 page

The valid discharge flag (VDQ) is asserted when the

bq2011 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 equal to 256 NAC counts with

VSRO < -400

µV.

The EDV 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 EDV is asserted with the

temperature less than 0°C

On first discharge after NAC = LMD

The end-of-discharge warning flag (EDV) warns the

user that the battery is empty. SEG1 blinks at a 4Hz

rate. EDV detection is disabled if VSR >VSR1. The EDV

flag is latched until a valid charge has been detected.

The EDV values are:

Where EDV is:

Valid charge action detected and VSB

≥

0.90V

1VSB < 0.90V providing that VSR < VSR1

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 bq2011 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.

The bq2011 calculates the available charge as a function

of NAC, temperature, and a full reference, either LMD

or PFC. The results of the calculation are available via

the display port or the gas gauge field of the TMPGG

in 1

16 increments from 0 to

16.

bq2011

TMPGG Temperature Bits

3210

TMP3

TMP2

TMP1

TMP0

FLGS1 Bits

EDV

TMPGG Gas Gauge Bits

GG3

GG2

GG1

GG0

FLGS1 Bits

VDQ

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

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