BQ2014_15 Datasheet, PDF (10/27 Pages) Texas Instruments – Gas Gauge IC with External Charge Control

Not Recommended For New Designs
bq2014
bq2014 Registers
The bq2014 command and status registers are listed in
Table 6 and described below.
Command Register (CMDR)
The write-only CMDR register is accessed when eight
valid command bits have been received by the bq2014.
The CMDR register contains two fields:
n W/R bit
n Command address
The W/R bit of the command register is used to select
whether the received command is for a read or a write
function.
The W/R values are:
CMDR Bits
7
65
4
3
2
1
0
W/R - -
-
-
-
-
-
Where W/R is:
0 The bq2014 outputs the requested register
contents specified by the address portion of
CMDR.
1 The following eight bits should be written
to the register specified by the address por-
tion of CMDR.
The lower seven-bit field of CMDR contains the address
portion of the register to be accessed. Attempts to write
to invalid addresses are ignored.
CMDR Bits
765 4
3
2
1
0
-
AD6 AD5 AD4
AD3
AD2
AD1
AD0
(LSB)
Primary Status Flags Register (FLGS1)
The read-only FLGS1 register (address=01h) contains
the primary bq2014 flags.
The charge status flag (CHGS) is asserted when a
valid charge rate is detected. Charge rate is deemed
valid when VSRO > VSRQ. A VSRO of less than VSRQ 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 <
VSRQ
1 VSRO > VSRQ
The battery replaced flag (BRP) is asserted whenever
the potential on the SB pin (relative to VSS), VSB, falls
from above the maximum cell voltage, MCV (2.25V), or
rises above 0.1V. The BRP flag is also set when the
bq2014 is reset (see the RST register description). BRP
is reset when either a valid charge action increments
NAC to be equal to LMD, or a valid charge action is de-
tected after the EDV1 flag is asserted. 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 Battery is charged until NAC = LMD or dis-
charged until the EDV1 flag is asserted
1 VSB dropping from above MCV, VSB rising
from below 0.1V, or a serial port initiated
reset has occurred
The battery removed flag (BRM) is asserted whenever
the potential on the SB pin (relative to VSS) rises above
MCV or falls below 0.1V. The BRM flag is asserted until
the condition causing BRM is removed. Because of sig-
nal filtering, 30 seconds may have to transpire for BRM
to react to battery insertion or removal.
The BRM values are:
FLGS1 Bits
7
65
4
3
2
1
0
-
- BRM -
-
-
-
-
Where BRM is:
0 0.1V < VSB < 2.25V
1 0.1V > VSB or VSB > 2.25V
The capacity inaccurate flag (CI) is used to warn the
user that the battery has been charged a substantial
number of times since LMD has been updated. The CI
flag is asserted on the 64th charge after the last LMD
update or when the bq2014 is reset. The flag is cleared
after an LMD update.
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