BQ2011K_11 Datasheet, PDF (11/22 Pages) Texas Instruments – Gas Gauge IC for High Discharge Rates

bq2011K
The charge status flag (CHGS) is asserted when a
valid charge rate is detected. Charge rate is deemed
valid when VSRO < -400µV. A VSRO of greater than-
400µV or discharge activity clears CHGS.
The CHGS values are:
FLGS1 Bits
7
65
4
3
2
1
0
CHGS - -
-
-
-
-
-
Where CHGS is:
0 Either discharge activity detected or VSRO >
-400µ V
1 VSRO < -400µV
The battery replaced flag (BRP) is asserted whenever
the potential on the SB pin (relative to VSS), VSB, rises
above 0.1V and determines the internal registers have
been corrupted. The BRP flag is also set when the
bq2011K is reset (see the RST register description).
BRP is cleared if either the bq2011K is charged until
NAC = LMD or discharged until EDV is reached. BRP =
1 signifies that the device has been reset.
The BRP values are:
FLGS1 Bits
7
65
4
3
2
1
0
- BRP -
-
-
-
-
-
Where BRP is:
0 bq2011K is charged until NAC = LMD or
discharged until the EDV flag is asserted
1 Initial or full VCC reset, or a serial port ini-
tiated reset has occurred
The maximum cell voltage flag (MCV) is asserted
whenever the potential on the SB pin (relative to VSS) is
above 2.0V. The MCV flag is asserted until the condition
causing MCV is removed.
The MCV values are:
FLGS1 Bits
7
65
4
3
2
1
0
-
- MCV -
-
-
-
-
Where MCV is:
0 VSB < 2.0V
1 VSB > 2.0V
The valid discharge flag (VDQ) is asserted when the
bq2011K 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:
I The self-discharge count register (SDCR) has
exceeded the maximum acceptable value (4096
counts) for an LMD update.
I A valid charge action equal to 256 NAC counts with
VSRO < -400µV.
I The EDV 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 EDV is asserted with the
temperature less than 0°C
1 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 OVLD = 1. The EDV
flag is latched until a valid charge has been detected.
The EDV values are:
FLGS1 Bits
7 65 4
3
2
1
0
-
--
-
-
- EDV -
Where EDV is:
0 Valid charge action detected
1 VSB < VEDV
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 bq2011K contains an internal temperature sensor.
The temperature is used to set charge efficiency factors
as well as to adjust the self-discharge coefficient. The
temperature register contents may be translated as
shown in Table 6.
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