BQ2040 Datasheet, PDF (19/33 Pages) Texas Instruments – Gas Gauge IC With SMBus Interface

bq2040
Where LTF is:
0 Temperature > 15°C
1 Temperature < 12°C
Bit 0, the Overcurrent flag (OC), is set when Current is
25% greater than the programmed charging current. If
the charging current is programmed less than 1024mA,
overcurrent is set if Current is 256mA greater than the
programmed charging current. This flag is cleared when
Current falls below 256mA.
The OC value is:
765
-
-
-
FLAGS2 Bits
432
-
-
-
1
0
-
OC
The IMIN value is:
Where IMIN is:
0 A valid current taper termination condition
is not present.
1 Valid current taper termination condition
detected.
The Valid Charge flag (VQ), bit 5, is set when VSRO ≥
|VSRD| and 10mAh of charge has accumulated. This bit
is cleared during a discharge and when VSRO ≤ |VSRD|.
76
-
-
FLAGS1 Bits
5
43210
VQ
-
-
-
-
-
Where OC is:
0 Current is less than 1.25 ∗ ChargingCur-
rent or less than 256mA if charging current
is programmed less than 1024mA
1 Current exceeds 1.25 ∗ ChargingCurrent or
256mA if the charging current is pro-
grammed less than 1024mA. This bit is
cleared if Current < 256mA.
FLAGS1
Bits 7 indicates that a ∆T/∆t termination condition
exists.
The ∆T/∆t value is:
7
6
∆T/∆t -
FLAGS1 Bits
5
43210
-
-
-
-
-
-
Where ∆T/∆t is:
0 The ∆T/∆t rate drops below the pro-
grammed rate.
1 The ∆T/∆t rate exceeds the programmed
rate.
Bit 6 indicates that a current taper termination condi-
tion exists.
FLAGS1 Bits
7
6
5
4
321
0
-
IMIN
-
-
-
-
-
-
The VQ value is:
Where VQ is:
0 VSRO ≤ |VSRD|
1 VSRO ≥ |VSRD| and 10mAh of charge has
accumulated
Bit 4 is reserved.
The Valid Discharge flag (VDQ), bit 3, is set when a
valid discharge is occurring (discharge cycle valid for
learning new full charge capacity) and cleared if a par-
tial charge is detected, EDV1 is asserted when T < 0°C,
or self-discharge accounts for more than 256mAh of the
discharge.
FLAGS1 Bits
7654
3
210
-
-
-
- VDQ -
-
-
The VDQ value is:
Where VDQ is:
0 Self-discharge is greater than 256mAh,
EDV1 = 1 when T < 0°C or VQ = 1
1 On first discharge after RM=FCC
The Overload flag (OVLD), bit 2, is set when the dis-
charge current is greater than the programmed rate and
cleared when the discharge current falls below the pro-
grammed rate.
FLAGS1 Bits
76543
2
10
-
-
-
-
- OVLD -
-
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