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參數(shù)資料
型號(hào): LTC2942IDCB#TRMPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: POWER SUPPLY SUPPORT CKT, PDSO6
封裝: 2 X 3 MM, LEAD FREE, PLASTIC, MO-229, DFN-6
文件頁(yè)數(shù): 1/18頁(yè)
文件大?。?/td> 227K
代理商: LTC2942IDCB#TRMPBF
LTC2942
1
2942fa
Typical applicaTion
DescripTion
Battery Gas Gauge
with Temperature,
Voltage Measurement
The LTC2942 measures battery charge state, battery
voltage and chip temperature in handheld PC and portable
productapplications.Itsoperatingrangeisperfectlysuited
forsingle-cellLi-Ionbatteries.Aprecisioncoulombcounter
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 No Latency ∑ ADC. The three measured
quantities (charge, voltage and temperature) are stored in
internal registers accessible via the onboard SMBus/I2C
interface.
TheLTC2942featuresprogrammablehighandlowthresh-
olds for all three measured quantities. If a programmed
threshold is exceeded, the device communicates an alert
using either the SMBus alert protocol or by setting a flag
in the internal status register.
The LTC2942 requires only a single low value sense resis-
tor to set the measured current range.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency
Σ, ThinSOT and Bat-Track are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FeaTures
applicaTions
n
Indicates Accumulated Battery Charge and
Discharge
n
High Accuracy Analog Integration
n
ADC Measures Battery Voltage and Temperature
n
Integrated Temperature Sensor
n
High Side Sense
n
1% Voltage and Charge Accuracy
n
±50mV Sense Voltage Range
n
SMBus/I2C Interface
n
Configurable Alert Output/Charge Complete Input
n
2.7V to 5.5V Operating Range
n
Quiescent Current Less than 100A
n
Small 6-Pin 2mm × 3mm DFN package
n
Low Power Handheld Products
n
Cellular Phones
n
MP3 Players
n
Cameras
n
GPS
Total Charge Error vs
Differential Sense Voltage
+
SENSE+
I2C/SMBus
TO HOST
SENSE
CHARGER
LTC2942
AL/CC
SDA
LOAD
0.1F
2942 TA01a
1-CELL
Li-Ion
RSENSE
100m
SCL
GND
VSENSE (mV)
0.1
–1.0
CHARGE
ERROR
(%)
0
–0.5
–1.5
0.5
1.0
1
10
100
2942 TA01b
–2.0
VSENSE+ = 3.6V
2.0
1.5
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