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| 型号： | LTC2942IDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/18页 |
| 文件大小： | 0K |
| 描述： | IC FUEL/GAS GAUGE LI-ION 6DFN |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 配用： | DC1496B-B-ND - BOARD EVAL LTC2942 |
| 其它名称： | LTC2942IDCB#TRMPBFDKR |
LTC2942
OPERATION
Overview
The LTC2942 is a battery gas gauge device designed for
use with single Li-Ion cells and other battery types with a
terminal voltage at 2.7V to 5.5V. It measures battery charge
and discharge, battery voltage and chip temperature.
A precision coulomb counter integrates current through a
sense resistor between the battery’s positive terminal and
the load or charger. Battery voltage and on-chip temperature
are measured with an internal 14-bit/10-bit ADC.
Coulomb Counter
Charge is the time integral of current. The LTC2942 mea-
sures battery current by monitoring the voltage developed
across a sense resistor and then integrates this information
to infer charge. The differential voltage between SENSE +
and SENSE – is applied to an auto-zeroed differential analog
integrator to convert the measured current to charge.
When the integrator output ramps to REFHI or REFLO
levels, 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
charge register (ACR) value is incremented or decremented
one count. The value of accumulated charge is read via
the I 2 C interface.
Voltage and Temperature ADC
The LTC2942 includes a 14-bit No Latency ?Σ analog-to-
digital converter, with internal clock and voltage reference
circuits.
The ADC can either be used to monitor the battery voltage
at SENSE – or to convert the output of the on-chip tempera-
ture sensor. The sensor generates a voltage proportional to
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 I 2 C interface. The
LTC2942 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.
CHARGER
LOAD
1
SENSE +
V CC
S1
REFHI
+
–
CONTROL
LOGIC
R SENSE
S2
S3
M
PRESCALER
ACR
I BAT
BATTERY
+
6
2
SENSE
GND
–
S4
REFLO
+
–
POLARITY
DETECTION
2942 F02
Figure 2. Coulomb Counter Section of the LTC2942
2942fa
7
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相关代理商/技术参数 |
参数描述 |
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| LTC2943CDD#PBF | 制造商:Linear Technology 功能描述:IC GAS GAUGE MULTICELL 8DFN 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, 20V, DFN-8, Battery Management Function:Fuel Gauge, Battery Type:-, Supply Voltage Min:3.6V, Supply Voltage Max:20V, Battery IC Case Style:DFN, No. of Pins:8, IC Interface Type:I2C, SMBus, Package / Case:8-DFN , RoHS Compliant: Yes |
| LTC2943CDD#TRPBF | 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, 20V, DFN-8, Battery Management Function:Fuel Gauge, Supply Voltage Min:3.6V, Supply Voltage Max:20V, Battery IC Case Style:DFN, No. of Pins:8, IC Interface Type:I2C, SMBus, Operating Temperature Min:0C , RoHS Compliant: Yes |
| LTC2945CMS#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:IC POWER MONITOR I2C 12-MSOP 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Wide Range I2C Power Monitor (SDAO) |
| LTC2945CMS#TRPBF | 制造商:Linear Technology 功能描述:IC POWER MONITOR I2C 12-MSOP 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Wide Range I2C Power Monitor (SDAO) |
| LTC2945CMS-1#PBF | 制造商:Linear Technology 功能描述:I2C Power Monitor 12-Pin MSOP 制造商:Linear Technology 功能描述:IC POWER MONITOR I2C 12-MSOP |
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