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IIC通讯方式的库仑计数器 LTC2942 手册
资料介绍
芯片引脚较少，外围电路也比较简单，数据比较稳定
部分文件列表
| 文件名 | 大小 |
| 2942fa.pdf | 232K |
部分页面预览
（完整内容请下载后查看）LTC2942
Battery Gas Gauge
with Temperature,
Voltage Measurement
FeaTures
DescripTion
The LTC®2942 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
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
±±5mꢀ Sense ꢀoltage Range
2
n
SMBus/I C Interface
2
n
Configurable Alert Output/Charge Complete Input
internal registers accessible via the onboard SMBus/I C
interface.
n
2.7ꢀ to ±.±ꢀ Operating Range
n
Quiescent Current Less than 155µA
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.
n
Small 6-Pin 2mm × 3mm DFN package
applicaTions
n
Low Power Handheld Products
n
n
n
n
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.
Cellular Phones
MP3 Players
Cameras
GPS
Typical applicaTion
Total Charge Error vs
Differential Sense Voltage
2.0
V
+ = 3.6V
SENSE
1.5
1.0
CHARGER
LOAD
0.1µF
+
SENSE
LTC2942
AL/CC
0.5
R
SENSE
100mΩ
2
I C/SMBus
0
–
SDA
SCL
SENSE
TO HOST
–0.5
–1.0
–1.5
–2.0
+
1-CELL
Li-Ion
GND
2942 TA01a
0.1
1
10
100
V
(mV)
SENSE
2942 TA01b
2942fa
1
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