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參數(shù)資料
| 型號： | bq2050H |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Low-Cost Lithium Ion Power Gauge IC(低價格鋰離子電源氣體Gauge芯片) |
| 中文描述： | 低成本鋰離子動力計IC（低價格鋰離子電源氣體計芯片） |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 213K |
| 代理商： | BQ2050H |
Select:
PFC = 30720 counts or 48mVh
PROG
1
= float
PROG
2
= low
PROG
3
= high
PROG
4
= float
PROG
5
= float
The initial full battery capacity is 48mVh (960mAh)
until the bq2050H “l(fā)earns” a new capacity 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.
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 = LMD. 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
duringtheperiodbetweenNAC=LMDandEDV1.
I
The self-discharge is less than 6% of NAC.
I
The temperature is
≥
0°C when the EDV1 level
is reached during discharge.
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 prevents
invalidDCRvaluesfromcorruptingLMD.
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
capacitycompensatedfordischargerateandtemperature.
Charge Counting
Charge activity is detected based on a positive voltage
on the SR input.
If charge activity is detected, the
bq2050H increments NAC at a rate proportional to V
SR
and,if enabled,activates an LED display.
The bq2050H 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 detected based on a negative volt-
age 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 bq2050H continuously decrements NAC and incre-
ments DCR for self-discharge based on time and tempera-
ture.
Charge/Discharge Current
The bq2050H 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.
Count Compensations
Compensated Available Capacity
Compensated Available Capacity compensation is based
on the rate of discharge, temperature, and negative
electrode type. Tables 3A and 3B outline the correction
factor typically used for graphite-anode Li-Ion batteries,
and Tables 4A and 4B outline the factors typically used for
coke-anode Li-Ion batteries. The compensation factor is
applied to NAC to derive the CACD and CACT values.
7
bq2050H
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