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参数资料
| 型号： | LTC2941IDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC FUEL/GAS GAUGE LI-ION 6DFN |
| 标准包装： | 500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 包装： | 带卷 (TR) |
| 配用： | DC1496A-A-ND - BOARD EVAL LTC2941 |
LTC2941
APPLICATIONS INFORMATION
R SENSE ≤
R SENSE ≤
0.085mAh ? 2 16
Thevalueoftheexternalsenseresistorisdeterminedby
the maximum input range of V SENSE and the maximum
current of the application:
50mV
I MAX
The choice of the external sense resistor value influences
the gain of the coulomb counter. A larger sense resistor
gives a larger differential voltage between SENSE + and
SENSE – for the same current which results in more precise
coulomb counting. Thus the amount of charge represented
by the least significant bit (q LSB ) of the accumulated charge
(registers C, D) is given by:
exhausted or overflow during charge. Choose in this case
a maximum R SENSE of:
? 50m ?
Q BAT
In an example application where the maximum current is
I MAX = 100mA, calculating R SENSE = 50mV/I MAX would
lead to a sense resistor of 500mΩ. This gives a q LSB of
8.5μAh and the accumulated charge register can represent
a maximum battery capacity of Q BAT = 8.5μAh ? 65535 =
557mAh. If the battery is larger, R SENSE must be lowered.
For example, R SENSE must be reduced to 150mΩ if a bat-
tery with a capacity of 1800mAh is used.
50m ? M
or
q LSB = 0.085mAh ?
q LSB = 0.085mAh ?
?
R SENSE 128
50m ?
R SENSE
For case B: In applications using a small battery but having
a high maximum current, q LSB can get quite large with
respect to the battery capacity. For example, if the battery
capacity is 100mAh and the maximum current is 1A, the
standard equation leads to choose a sense resistor value
of 50mΩ, resulting in:
q LSB = 0.085mAh ?
50m ? M
when the prescaler is set to its default value of M=128.
Note that 1mAh = 3.6A ? s = 3.6C (coulombs).
Choosing R SENSE = 50mV/I MAX is not sufficient in
applications where:
A. the battery capacity (Q BAT ) is very large compared to
the maximum current (I MAX ):
Q BAT > I MAX ? 5.5 hours
B. the battery capacity (Q BAT ) is very small compared to
the maximum current (I MAX ):
Q BAT < I MAX ? 0.1 hours
For case A: In low current applications using a large bat-
tery, choosing R SENSE according to R SENSE = 50mV/I MAX
can lead to a q LSB smaller than Q BAT /2 16 and the 16-bit
accumulated charge may underflow before the battery is
q LSB = 0.085mAh = 306mC
The battery capacity then corresponds to only 1176 q LSB s
and less than 2% of the accumulated charge register is
utilized.
To preserve digital resolution in this case, the LTC2941
includes a programmable prescaler. Lowering the prescaler
factor M allows reducing q LSB to better match the accu-
mulated charge registers C and D to the capacity of the
battery. The prescaling factor M can be chosen between 1
and its default value 128. The charge LSB then becomes:
?
R SENSE 128
To use as much of the range of the accumulated charge
registers C and D as possible the prescaler factor M should
2941fa
9
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