Datasheet

Primary Status Flags Register (FLGS1)
The FLGS1 register (address=01h) contains the primary
bq2013H flags.
The charge status flag (CHGS) is asserted when a
valid charge rate is detected. The bq2013H deems the
charge valid if it results in two NAC updates with V
SRO
> 250µV.AV
SRO
of less than 250µV or discharge activity
clears CHGS.
The CHGS location is:
FLGS1 Bits
76543 2 1 0
CHGS - -- - - - -
where CHGS is
0 Either discharge activity detected or
V
SRO
< 250µV
1 Two NAC updates with V
SRO
> 250µV
The battery replaced flag (BRP) is asserted whenever
the bq2013H is reset by application of V
CC
or by a serial
port command. BRP is reset when either a valid charge
action increments NAC to be equal to LMD, or when a
valid charge action is detected after the EDV1 flag is
asserted. BRP = 1 signifies that the device has been re-
set.
The BRP location is:
FLGS1 Bits
76543 2 1 0
- BRP - - - - - -
where BRP is
0 bq2013H is charged until NAC = LMD or
on the first charge after or a discharge
which sets the EDV1 flag
1 bq2013H is reset
The valid discharge flag (VDQ) is asserted when the
bq2013H is discharged from NAC=LMD. The flag re-
mains set until either LMD is updated or until one of
three actions that can clear VDQ occurs:
■
NAC has been reduced by more than 6% during
because of self-discharge since VDQ was set
■
A valid charge action sustained at V
SRO
>V
SRQ
for at
least two NAC updates
■
The EDV1 flag was set at a temperature below 0°C.
The VDQ location is:
FLGS1 Bits
76543 2 1 0
- - - - VDQ - - -
where VDQ is
0 Self-discharge reduces NAC by 6%, valid
charge action detected, EDV1 asserted with
the temperature less than 0°C, or reset
1 On first discharge after NAC = LMD
The first end-of-discharge warning flag (EDV1)
warns the user that the battery is empty. SEG1 blinks
at a 4Hz rate and DONE is asserted low. EDV1 detec-
tion is disabled if OVLD = 1. The EDV flag is latched
until a valid charge has been detected.
The EDV1 location is:
FLGS1 Bits
7654 3 2 1 0
- - - - - - EDV1 -
where EDV1 is
0 Valid charge action detected or V
SB
≥
V
EDV1
1V
SB
< V
EDV1
for the delay time, provided
that the OVLD bit is not set
The final end-of-discharge warning flag (EDVF) flag
is used to warn that battery power is at a failure condi-
tion. All segment drivers are turned off. The EDVF flag
is latched until a valid charge has been detected. The
EDVF threshold is set 100mV below the EDV1 thresh-
old.
The EDVF location is:
FLGS1 Bits
7654 3 2 1 0
---- - - -EDVF
Where EDVF is:
0 Valid charge action detected or V
SB
≥
V
EDVF
1V
SB
<V
EDVF
, providing the OVLD bit is not
set
12
bq2013H