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参数资料
| 型号： | LTC2942CDCB-1#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6 |
| 文件页数： | 14/16页 |
| 文件大小： | 230K |
| 代理商： | LTC2942CDCB-1#TRMPBF |
LTC2942-1
29421f
Coulomb Counter
Charge is the time integral of current. The LTC2942-1 mea-
sures battery current by monitoring the voltage developed
across its internal sense resistor and then integrates this
information to infer charge. The internal sense resistor is
tied between the SENSE+ and SENSE– pins and is con-
nected to an auto-zeroed differential analog integrator
which converts the measured current to charge.
When the integrator output reaches the REFHI or REFLO
thresholds, switches S1, S2, S3 and S4 toggle to reverse
the ramp direction. By observing the condition of the
switches and the ramp direction, polarity is determined. A
programmable prescaler effectively increases integration
time by a factor M programmable from 1 to 128. At each
underflow or overflow of the prescaler, the accumulated
chargeregister(ACR)valueisincrementedordecremented
one count. The value of accumulated charge is read via
the I2C interface.
Voltage and Temperature ADC
The LTC2942-1 includes a 14-bit No Latency
Σ analog-
to-digital converter, with internal clock and voltage refer-
ence circuits.
+
LOAD
CHARGER
RSENSE
BATTERY
IBAT
–
+
–
+
–
+
S4
RBOND
REFHI
REFLO
S3
S2
S1
VCC
SENSE+
1
SENSE–
6
GND
2
POLARITY
DETECTION
CONTROL
LOGIC
M
PRESCALER
ACR
29421 F02
Figure 2. Coulomb Counter Section of the LTC2942-1
The ADC can either be used to monitor the battery voltage
at SENSE– or to convert the output of the on-chip tempera-
turesensor.Thesensorgeneratesavoltageproportionalto
temperature with a slope of 2.5mV/K resulting in a voltage
of 750mV at 27°C.
Conversion of either temperature or voltage is triggered
by setting the control register via the I2C interface. The
LTC2942-1 features an automatic mode where a voltage
and a temperature conversion are executed every two
seconds. At the end of each conversion the corresponding
registers are updated and the converter goes to sleep to
minimize quiescent current.
Power-Up Sequence
When VSENSE+ rises above a threshold of approximately
2.5V, the LTC2942-1 generates an internal power-on reset
(POR) signal and sets all registers to their default state.
In the default state, the coulomb counter is active while
the voltage and temperature ADC is switched off. The
accumulated charge register is set to mid-scale (7FFFh),
all low threshold registers are set to 0000h and all high
threshold registers are set to FFFFh. The alert mode is
enabled and the coulomb counter pre-scaling factor M
is set to 128.
operaTion
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| LTC2942IDCB#PBF | 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, LI-ION, 5.5V, DFN-6 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, LI-ION, 5.5V, DFN-6, Battery Management Function:Fuel Gauge, Status Monitor, Battery Type:Li-Ion, Supply Voltage Min:2.7V, Supply Voltage Max:5.5V, Battery IC Case Style:DFN, No. of Pins:6, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Cut Tape Battery Gas Gauge with Temperature & Voltage M |
| LTC2942IDCB#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 |
| LTC2942IDCB#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 |
| LTC2942IDCB-1#PBF | 制造商:Linear Technology 功能描述: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 |
| LTC2942IDCB-1#PBF | 制造商:Linear Technology 功能描述:IC BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 |
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