Datasheet

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 V
SRO
> V
SRQ
for at
least 256 NAC counts.
n
The EDV1 flag was set at a temperature below 0°C
The VDQ values are:
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, SEG
1
, 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:
0 Valid charge action detected, V
SB
≥
1.05V
1V
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:
Where EDVF is:
0 Valid charge action detected, V
SB
≥
0.95V
1V
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.
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.
12
bq2010
TMPGG Temperature Bits
7 6 5 4 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
01000°C < T < 10°C
010110°C < T < 20°C
011020°C < T < 30°C
011130°C < T < 40°C
100040°C < T < 50°C
100150°C < T < 60°C
101060°C < T < 70°C
101170°C < T < 80°C
1100 T > 80°C
FLGS1 Bits
7654 3 2 1 0
---- - - -EDVF
FLGS1 Bits
7654 3 2 1 0
- - - - - - EDV1 -
FLGS1 Bits
76543 2 1 0
- - - - VDQ - - -