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参数资料
| 型号： | LTC2942IDCB#TRPBF |
| 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-229, DFN-6 |
| 文件页数： | 16/18页 |
| 文件大小： | 227K |
| 代理商： | LTC2942IDCB#TRPBF |
LTC2942
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2942fa
operaTion
Overview
The LTC2942 is a battery gas gauge device designed for
use with single Li-Ion cells and other battery types with a
terminalvoltageat2.7Vto5.5V.Itmeasuresbatterycharge
and discharge, battery voltage and chip temperature.
A precision coulomb counter integrates current through a
sense resistor between the battery’s positive terminal and
theloadorcharger.Batteryvoltageandon-chiptemperature
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
acrossasenseresistorandthenintegratesthisinformation
to infer charge. The differential voltage between SENSE+
andSENSE–isappliedtoanauto-zeroeddifferentialanalog
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.
Aprogrammableprescalereffectivelyincreasesintegration
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 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-
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 features an automatic mode where a voltage and
atemperatureconversionareexecutedeverytwoseconds.
At the end of each conversion the corresponding registers
are updated and the converter goes to sleep to minimize
quiescent current.
+
LOAD
CHARGER
RSENSE
BATTERY
IBAT
–
+
–
+
–
+
S4
REFHI
REFLO
S3
S2
S1
VCC
SENSE+
1
SENSE–
6
GND
2
POLARITY
DETECTION
CONTROL
LOGIC
M
PRESCALER
ACR
2942 F02
Figure 2. Coulomb Counter Section of the LTC2942
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相关代理商/技术参数 |
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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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