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IIC通讯方式的库仑计数器 LTC2942 手册

更新时间：2019-11-11 08:35:54 大小：232K 上传用户：tianliang111查看TA发布的资源 标签：LTC2942IIC通讯库仑计数器 下载积分：2分 评价赚积分 （如何评价?） 打赏 收藏 评论(0) 举报

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

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文件名 大小
2942fa.pdf 232K

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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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