参数资料
| 型号： | AS3658F-BCTP |
| 厂商： | ams |
| 文件页数： | 61/158页 |
| 文件大小： | 0K |
| 描述： | IC PMU POWER/AUDIO 124-CTBGA |
| 标准包装： | 2,500 |
| 应用： | 便携式设备 |
| 电流 - 电源： | 7mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 124-TFBGA |
| 供应商设备封装： | 124-CTBGA（8x8） |
| 包装： | 带卷 (TR) |
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AS3658
Data Sheet Confidential
- Detailed Description-Power Management Functions
transferred to the DeltaCharge register. The CalReq bit is cleared automatically after the calibration has completed
successfully and FGOffCal has been written to the register.
Please note that offset calibration is not possible while the charger is active. If the CalReq bit is set while the charger is
active the calibration will start automatically after the charger has been disabled by clearing the ChEn bit or if the
external charge adapter has been removed. If during an offset calibration procedure the charger is enabled the offset
calibration mode is terminated, the CalReq bit is cleared, the current value of the elapsed time counter is transferred to
the ElapsedTime register and the DeltaCharge register is loaded with (FFFF)h.
Calculation of Battery Status
The host system can calculate all the parameters necessary for estimating the remaining battery capacity by
evaluating ElapsedTime , DeltaCharge and FGOffCal .
Calculating Elapsed Time
The host system can evaluate the change in time Δ t by setting the UpdReq bit in the FuelGauge register and reading
ElapsedTime after UpdReq has been automatically cleared. The change in time in seconds is given by:
Δ t = ElapsedTime x 3600 / 4096.60 [s]
(EQ 1)
Note that the absolute accuracy of Δ t is directly related to the absolute accuracy of the internal reference oscillator. To
cancel the error associated with the accuracy of the oscillator, a correction factor CV can be introduced. CV can be
evaluated by comparing the change in time calculated by (1) with some reference value Δ t REF obtained from a RTC or
measured during system calibration. CV is given by:
CV = Δ t REF / Δ t
By multiplying Δ t and CV the correct value for the change in time can be calculated:
Δ t CORR = CV x Δ t [s]
Calculating Average Current
The host system can calculate the average current during the last time period by setting the UpdReq bit in the
FuelGauge register and reading DeltaCharge and ElapsedTime after UpdReq has been automatically cleared.
Together with FGOffCal determined during offset calibration mode the average current is given by:
I AVG = DeltaCharge / ( Δ t x A VFC x R sense ) – FGOffCal x 3.05μV / R sense [A]
(EQ 2)
(EQ 3)
(EQ 4)
Δ t is the change in time in seconds calculated by (1), A VFC is the gain of the VFC in Hz/V, R sense is the value of the
sense resistor in Ω and FGOffCal is the offset calibration value. As DeltaCharge and Δ t both are proportional to the
oscillator frequency, no correction factor needs to be introduced in the formula.
Calculating Accumulated Current
Accumulated current is used to calculate the absolute remaining capacity of the battery. It is given by:
I ACC = I AVG x Δ t CORR [A]
Calculating the Remaining Capacity
Remaining capacity is the entire goal of fuel gauging. It is given by:
RC = RC + I ACC [As]
(EQ 5)
(EQ 6)
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Revision 1v13
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