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参数资料
| 型号： | LTC2942CDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC FUEL/GAS GAUGE LI-ION 6DFN |
| 标准包装： | 2,500 |
| 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： | 0°C ~ 70°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： | DC1496B-B-ND - BOARD EVAL LTC2942 |
LTC2942
APPLICATIONS INFORMATION
R SENSE ≤
q LSB = 0.085mAh ?
50m ? M
q LSB = 0.085mAh ?
R SENSE ≤
0.085mAh ? 2 16
Alert/ChargeCompleteConfigurationB[2:1]
The AL /CC pin is a dual function pin configured by the
control register. By setting bits B[2:1] to [10] (default)
the AL /CC pin is configured as an alert pin following the
SMBus protocol. In this configuration the AL /CC pin is a
digital output and is pulled low if one of the three mea-
sured quantities (charge, voltage, temperature) exceeds
its high or low threshold or if the value of the accumulated
charge register overflows or underflows. An alert response
procedure started by the master resets the alert at the
AL /CC pin. For further information see the Alert Response
Protocol section.
Setting the control bits B[2:1] to [01] configures the AL /CC
pin as a digital input. In this mode, a high input on the
AL /CC pin communicates to the LTC2942 that the battery
is full and the accumulated charge register is set to its
maximum value FFFFh. The AL /CC pin would typically
be connected to the “charge complete” output from the
battery charger circuitry.
If neither the alert nor the charge complete functionality
is desired, bits B[2:1] should be set to [00]. The AL /CC
pin is then disabled and should be tied to GND.
Avoid setting B[2:1] to [11] as it enables the alert and the
charge complete modes simultaneously.
Choosing R SENSE
To achieve the specified precision of the coulomb counter,
the differential voltage between SENSE + and SENSE – must
stay within ±50mV. For differential input signals up to
±300mV the LTC2942 will remain functional but the preci-
sion of the coulomb counter is not guaranteed.
The required value of the external sense resistor, R SENSE ,
is determined by 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 equal to:
?
R SENSE 128
or
50m ?
R SENSE
when the prescaler is set to its default value of M = 128.
Note that 1mAh = 3.6C (coulomb).
Choosing R SENSE = 50mV/I MAX is not sufficient in ap-
plications where the battery capacity (Q BAT ) is very large
compared to the maximum current (I MAX ):
Q BAT > I MAX ? 5.5 Hours
For such low current applications with a large battery,
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 accu-
mulated charge register may underflow before the battery
is 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 capacity is larger, R SENSE must be
lowered. For example, R SENSE must be reduced to 150mΩ
if a battery with a capacity of 1800mAh is used.
2942fa
10
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