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参数资料
| 型号： | LTC2941IDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16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
Q BAT R SENSE
M ≥ 128 ? ?
? 0.085mAh 50m ?
2
bechosenforagivenbatterycapacityQ BAT andasense
resistor R SENSE as:
16
M can be set to 1, 2, 4, 8, …128 by programming B[5:3]
of the control register as M = 2 (4 ? B[5] + 2 ? B[4] + B[3]) . The
default value after power up is M = 128 = 2 7 (B[5:3] = 111).
In the above example of a 100mAh battery and a R SENSE
of 50mΩ, the prescaler should be programmed to M = 4.
The q LSB then becomes 2.656μAh and the battery capacity
corresponds to roughly 37650 q LSB s.
Note that the internal digital resolution of the coulomb
counter is higher than indicated by q LSB . The digitized
charge q INTERNAL is M ? 8 smaller than q LSB . q INTERNAL is
typically 299μAs for a 50mΩ sense resistor.
V BAT Alert B[7:6]
The V BAT alert function allows the LTC2941 to monitor
the voltage at SENSE – . If enabled, a drop of the voltage
at the SENSE – pin below a preset threshold is detected
and bit A[1] in the status register is set. If the alert mode
is enabled by setting B[2] to one, an alert is generated at
the AL /CC pin. The threshold for the V BAT alert function
is selectable according to Table 3.
Accumulated Charge Registers (C, D)
The coulomb counter of the LTC2941 integrates current
through the sense resistor. The 16-bit result of this charge
integration is stored in the accumulated charge registers
C and D. As the LTC2941 does not know the actual battery
status after initial power-up, the accumulated charge is
set to mid-scale (7FFFh). If the host knows the status of
the battery , the accumulated charge registers C[7:0] and
D[7:0] can be either programmed to the correct value via
I 2 C or it can be set after charging to FFFFh (full) by pulling
the AL /CC pin high (if charge complete mode is enabled
via bits B[2:1]). Before writing the accumulated charge
registers, the analog section should be shut down by setting
B[0] to 1. In order to avoid a change in the accumulated
charge registers between reading MSBs C[7:0] and LSBs
D[7:0], it is recommended to read them sequentially, as
shown in Figure 8.
Threshold Registers (E, F), (G, H)
For battery charge, the LTC2941 features a high and a
low threshold register. At power-up the high threshold
is set to FFFFh while the low threshold is set to 0000h.
Both thresholds can be programmed to a desired value via
I 2 C. As soon as the accumulated charge exceeds the high
threshold or falls below the low threshold, the LTC2941
sets the corresponding flag in the status register and pulls
the AL /CC pin low if alert mode is enabled.
I 2 C Protocol
The LTC2941 uses an I 2 C/SMBus compatible 2-wire open-
drain interface supporting multiple devices and masters on
a single bus. The connected devices can only pull the bus
wires LOW and they never drive the bus HIGH. The bus
wires should be externally connected to a positive sup-
ply voltage via a current source or pull-up resistor. When
the bus is idle, both SDA and SCL are HIGH. Data on the
I 2 C-bus can be transferred at rates of up to 100kbit/s in
standard mode and up to 400kbit/s in fast mode.
Each device on the I 2 C/SMBus is recognized by a unique
address stored in that device and can operate as either a
transmitter or receiver, depending on the function of the
device. In addition to transmitters and receivers, devices
can also be classified as masters or slaves when perform-
ing data transfers. A master is the device which initiates a
data transfer on the bus and generates the clock signals to
permit that transfer. At the same time any device addressed
is considered a slave. The LTC2941 always acts as a slave.
Figure 4 shows an overview of the data transmission on
the I 2 C bus.
2941fa
10
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相关代理商/技术参数 |
参数描述 |
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| LTC2942CDCB#PBF | 制造商:Linear Technology 功能描述:IC, BATTERY GAS GAUGE, LI-ION, DFN-6; Battery Management Function:Fuel Gauge; Battery Type:Li-Ion; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Battery IC Case Style:DFN; No. of Pins:6; IC Interface Type:I2C ;RoHS Compliant: Yes |
| LTC2942CDCB#TRMPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC2942CDCB#TRPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC2942CDCB-1#PBF | 制造商:Linear Technology 功能描述:IC BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6; Battery Management Function:Fuel Gauge, Charge Controller; Battery Type:Li-Ion; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Battery IC Case Style:DFN; No. of Pins:6 ;RoHS Compliant: Yes |
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