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參數(shù)資料
| 型號(hào)： | bq2014H |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Low-Cost NiCd/NiMH Gas Gauge IC(低價(jià)格NiCd/NiMHGas Gauge芯片) |
| 中文描述： | 低成本鎳鎘/鎳氫電池電量監(jiān)測計(jì)芯片（低價(jià)格鎳鎘/ NiMHGas計(jì)芯片） |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 185K |
| 代理商： | BQ2014H |
Select:
PFC = 27648 counts or 173mVh
PROG
1
= low
PROG
2
= high
PROG
3
= float
PROG
4
= low
PROG
5
= low
The initial full battery capacity is 173mVh
(3460mAh) until the bq2014H “l(fā)earns” a new capac-
ity with a qualified discharge from full to EDV1.
3.
Nominal Available Capacity (NAC):
NAC counts up during charge to a maximum value
of LMD and down during discharge and self-dis-
charge to 0. NAC is reset to 0 on initialization and
on the first valid charge following discharge to
EDV1. To prevent overstatement of charge during
periods of overcharge, NAC stops incrementing
when NAC = LMD or 0.94
LMD if T < 0
°
C.
4.
Discharge Count Register (DCR):
The DCR counts up during discharge independent
of NAC and could continue increasing after NAC
has decremented to 0.
Prior to NAC = 0 (empty
battery), both discharge and self-discharge in-
crement the DCR. After NAC = 0, only discharge
increments the DCR. The DCR resets to 0 when
NAC
≥
0.94
LMD and a discharge is detected. The
DCR does not roll over but stops counting when it
reaches FFh.
The DCR value becomes the new LMD value on the
first charge after a valid discharge to V
EDV1
if all
the following conditions are met:
I
No valid charge initiations (charges greater than
2 NAC updates where V
SRO
> V
SRQ
) occurred
during the period between NAC
≥
0.94
LMD and
EDV1.
I
The self-discharge is less than 6.25% of NAC.
I
The temperature is
≥
0°C when the EDV1 level
is reached during discharge.
I
The discharge begins when NAC
≥
0.94
LMD.
I
VDQ is set.
The valid discharge flag (VDQ) indicates whether
the present discharge is valid for LMD update. If
the DCR update value is less than 0.94
LMD,
LMD will only be modified by 0.94
LMD. This pre-
ventsinvalidDCRvaluesfromcorruptingLMD.
5.
Scaled Available Energy (SAE):
SAE is useful in determining the available energy
within the battery, and may provide a more useful
capacity reference in battery chemistries with
sloped voltage profiles during discharge. SAE may
be converted to an mWh value using the following
formula:
E(mWh) = (SAEH
1 2
SAEL)
+ R
B2
+
256
(R
R
B2
SCALE
)
R
B1
S
where R
B1
, R
B2
, and R
S
are resistor values in
ohms, as shown in Figure 1. SCALE is the selected
scale from Table 2.
6. Compensated Available Capacity (CACT)
CACT counts similarly to NAC, but contains the
available capacity compensated for discharge rate
and temperature.
Charge Counting
Charge activity is detected based on a positive voltage
on the SR input.
If charge activity is detected, the
bq2014H increments NAC at a rate proportional to V
SR
and,if enabled,activates the LED display.
The bq2014H counts charge activity when the voltage at
the SR input (V
SRO
) exceeds the minimum charge
threshold (V
SRQ
). A valid charge is detected when NAC
has been updated twice without discharging or reaching
the digital magnitude filter time-out.
charge is detected, charge counting continues until V
SR
,
including offset,falls below V
SRQ
.
Once a valid
Discharge Counting
Discharge activity is indicated by a negative voltage on
the SR input. All discharge counts where V
SRO
is less
than the minimum discharge threshold (V
SRD
) cause
the NAC register to decrement and the DCR to
increment.
Self-Discharge Counting
The bq2014H continuously decrements NAC and incre-
ments DCR for self-discharge on the basis of time and tem-
perature.
Charge/Discharge Current
The bq2014H current-scale registers, VSRH and VSRL,
can be used to determine the battery charge or dis-
charge current. See the Current Scale Register descrip-
tion for details.
7
Preliminary
bq2014H
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