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參數(shù)資料
| 型號： | bq2945 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC with SMBus Interface(Gas Gauge芯片（帶SMBus 接口）) |
| 中文描述： | 氣體計(jì)IC，帶有SMBus接口（電量監(jiān)測計(jì)芯片（帶的SMBus接口）） |
| 文件頁數(shù)： | 7/32頁 |
| 文件大小： | 256K |
| 代理商： | BQ2945 |
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latest measured capacity in the Discharge Count Reg-
ister, representing a discharge from full to below
EDV1. A qualified discharge is necessary for a capac-
ity transfer from the DCR to the FCC register. Once
updated, the bq2945 writes the new FCC to the EE-
PROM. The FCC also serves as the 100% reference
threshold used by the relative state-of-charge calcula-
tion and display.
2.
DesignCapacity (DC):
The DC is the user-specified battery capacity and is
programmed from external EEPROM. The DC also
provides the 100% reference for the absolute dis-
play mode.
3.
RemainingCapacity (RM):
RM counts up during charge to a maximum value of
FCC and down during discharge and self-discharge to
0. RM is set to 000Ah after the EDV1 threshold has
been reached and a valid charge has been detected.
To prevent overstatement of charge during periods
of overcharge, RM stops incrementing when RM =
FCC.
RM may optionally be written to a user-
defined value when fully charged if the battery
pack is under bq2945 charge control. On initializa-
tion, RM is set to the value stored in EE
0x1e—0x1f.
4.
Discharge Count Register (DCR):
The DCR counts up during discharge independent
of RM and can continue increasing after RM has
decremented to 0. Prior to RM = 0 (empty battery),
both discharge and self-discharge increment the
DCR.
After RM = 0, only discharge increments
the DCR. The DCR resets to 0 when RM = FCC.
The DCR does not roll over but stops counting
when it reaches FFFFh.
The DCR value becomes the new FCC value on the
first charge after a qualified discharge to EDV1. A
qualified discharge to EDV1 occurs if all of the fol-
lowing conditions exist:
No valid charge initiations (charges greater than
10mAh), where V
SRO
> +V
SRD
occurred during
the period between RM = FCC and EDV1 de-
tected.
The self-discharge count is not more than
256mAh.
The temperature is
≥
273°K (0°C) when the
EDV1 level is reached during discharge.
The valid discharge flag (VDQ) in FLAGS1 indi-
cates whether the present discharge is valid for an
FCC update. FCC cannot be reduced by more than
256mAh during any single cycle.
Charge Counting
Charge activity is detected based on a positive voltage
on the SR input.
If charge activity is detected, the
bq2945 increments RM at a rate proportional to V
SRO
and, if enabled, activates an LED display. Charge ac-
tions increment the RM after compensation for charge
state and temperature.
7
bq2945
FG294501.eps
Temperature
Compensation
Charge
Current
Discharge
Current
Self-Discharge
Timer
Remaining
Capacity
(RM)
Full
Charge
Capacity
(FCC)
Discharge
Count
Register
(DCR)
<
Qualified
Transfer
+
Temperature, Other Data
+
-
-
+
Inputs
Main Counters
and Capacity
Reference (FCC)
Outputs
Two-Wire
Serial Interface
Chip-Controlled
Available Charge
LED Display
State-of-charge
and
Temperature
Compensation
Figure 2. Operational Overview
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| BQ294502 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries |
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