BQ2010_15 Datasheet, PDF (12/26 Pages) Texas Instruments – Gas Gauge IC

Not Recommended For New Designs
bq2010
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:
n _{The self-discharge count register (SDCR) has}
exceeded the maximum acceptable value (4096
counts) for an LMD update.
n _{A valid charge action sustained at VSRO > VSRQ for at}
least 256 NAC counts.
n _{The EDV1 flag was set at a temperature below 0°C}
The VDQ values are:
FLGS1 Bits
7
65
4
3
2
1
0
-
--
- VDQ -
-
-
Where VDQ is:
0 SDCR ≥ 4096, subsequent valid charge ac-
tion detected, or EDV1 is asserted with the
temperature less than 0°C
1 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:
FLGS1 Bits
7 65 4
3
2
1
0
-
--
-
-
- EDV1 -
Where EDV1 is:
0 Valid charge action detected, V_SB ≥ 1.05V
1 V_SB < 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:
FLGS1 Bits
7 65 4
3
2
-
--
-
-
-
1
0
- EDVF
Where EDVF is:
0 Valid charge action detected, V_SB ≥ 0.95V
1 V_SB < 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.
TMPGG Temperature Bits
7
6
5
4
3210
TMP3 TMP2 TMP1 TMP0 - - -
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.
TMP3
0
0
0
0
0
0
0
0
1
1
1
1
1
TMP2
0
0
0
0
1
1
1
1
0
0
0
0
1
TMP1
0
0
1
1
0
0
1
1
0
0
1
1
0
TMP0
0
1
0
1
0
1
0
1
0
1
0
1
0
Temperature
T < -30°C
-30°C < T < -20°C
-20°C < T < -10°C
-10°C < T < 0°C
0°C < T < 10°C
10°C < T < 20°C
20°C < T < 30°C
30°C < T < 40°C
40°C < T < 50°C
50°C < T < 60°C
60°C < T < 70°C
70°C < T < 80°C
T > 80°C
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