参数资料
| 型号： | AS3658F-BCTP |
| 厂商： | ams |
| 文件页数： | 60/158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
The key building block of the VFC is an integrator. It will integrate the voltage V SNS across input pins ISENSP and
ISENSN. If V SNS is positive (battery is charged), the output voltage of the integrator increases; a negative input voltage
(battery is discharged) will cause the integrator output voltage to decrease.
Table 50. Fuel Gauge parameters
Symbol
f CLK
Parameter
Internal reference
clock
Min
Typ
f clk_int /
2
Max
Unit
MHz
Note
internal CLK frequency/2
Programmable: 0.8 to 1.15 MHz
f VFC
Sample frequency
f CLK /59
Hz
V ISENSP
V ISENSN
Z ISENSP
Z ISENSN
Input voltage
Input impedance
-0.1
4.67
0.1
V
M Ω
A VFC
FR VFC
Discharge and Charge
gain
Fundamental rate
91.0
3.05
Hz / V
μVh
f CLK = 1.1MHz
V OFF
V OFF,COMP
Uncompensated offset
voltage
Compensated offset
voltage
-500
-50
± 10
500
50
μV
Charge Current Accumulator
The output signals of the charge count dividers are used as inputs for the charge current accumulator that is realized
as a 15-bit up-down counter with separate inputs for incrementing and decrementing the counter. An additional sign bit
indicates the polarity of the counter value that is maintained in two’s complement format. The current accumulator is
updated at a rate equivalent to one count per 3.05μVh, which is equivalent to one count per 61.03μAh when using a
50m Ω current sense resistor. It will roll over beyond (7FFF)h when incremented and (0000)h when decremented, and
the value given by the counter will be ambiguous in that case. It is the responsibility of the host to read the counter
before rollover occurs.
The content of the charge current accumulator will be transferred into the DeltaCharge register when the UpdReq bit in
the FuelGauge register has been set. The update of the register has to be synchronized to the sample clock f VFC and
can take up to 1.5 clock cycles (max. 2.5μs). After the registers have been updated successfully, the UpdReq bit is
cleared automatically and the charge current accumulator together with the sign bit will be reset.
Elapsed Time Counter
The sample clock f VFC of the fuel gauge circuit is fed to a 14-bit clock count divider. Its output signal is used as a
clocking signal for the 16-bit elapsed time counter, resulting in an equivalent rate of 1.1379 counts per second
(4096.60 counts = 1 hour). The elapsed time counter will rollover beyond (FFFF)h, and the value given by the counter
will be ambiguous in that case. It is the responsibility of the host to read the counter before rollover occurs.
The content of the elapsed time counter will be transferred into the ElapsedTime register when the UpdReq bit in the
FuelGauge register has been set. The update of the register has to be synchronized to the sample clock f VFC and can
take up to 1.5 clock cycles (max. 2.5μs). After the registers have been updated successfully, the UpdReq bit is cleared
automatically and the elapsed time counter will be reset.
Offset Calibration Mode
Although the VFC compensates for the offset of the integrator the fuel gauge features an additional offset calibration
mode to enhance the measurement accuracy even further. By setting the CalReq bit in the FuelGauge register the
integrator is reset and the offset calibration mode is activated. The charge count dividers are bypassed during offset
calibration to allow a faster calibration procedure with adequate resolution. The offset is accumulated during 16 clocks
of the elapsed time counter, the resulting offset calibration value FGOffCal has a resolution of 3.05μV and is
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