BQ2050H_15 Datasheet, PDF (13/30 Pages) Texas Instruments – Low-Cost Lithium Ion Power Gauge™ IC

Not Recommended For New Designs
bq2050H
Command Code Bits
76 5
4
3
2
1
0
-
AD6 AD5 AD4 AD3
AD2
AD1
AD0
(LSB)
Primary Status Flags Register (FLGS1)
The FLGS1 register (address = 01h) contains the pri-
mary bq2050H 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 V_SRO
≤ V_SRQ
1 V_SRO > V_SRQ
The battery replaced flag (BRP) is asserted whenever
the bq2050H is reset either 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 a
valid charge action is detected after the EDV1 flag is as-
serted. 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 bq2050H is reset
The protector status flag (PSTAT) provides information
on the state of the overvoltage protector within the Li-
Ion battery pack. The PSTAT flag is asserted whenever
this input is high and is cleared when the input is low.
The PSTAT values are:
FLGS1 Bits
76
5
4
3
2
1
0
-
- PSTAT -
-
-
-
-
Where PSTAT is:
0 PSTAT input is low (PSTAT < 0.5V)
1 PSTAT input is high (PSTAT > 2.5V)
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 bq2050H is reset. The flag is cleared
after an LMD update.
The CI values are:
FLGS1 Bits
7
65
4
3
2
1
0
-
-
- CI
-
-
-
-
Where CI is:
0 When LMD is updated with a valid full dis-
charge
1 After the 64th valid charge action with no
LMD updates or the bq2050H is reset
The valid discharge flag (VDQ) is asserted when the
bq2050H 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 When NAC has been reduced by more than 6%
because of self-discharge since VDQ was set.
I A valid charge action sustained at V_SRO > V_SRQ for
at least 2 NAC updates.
I 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 Self-discharge of 6% of NAC, valid charge
action detected, EDV1 asserted with the
temperature less than 0°C, or reset
1 On first discharge after NAC = LMD
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