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Linear Technology - 1A Battery Gas Gauge

Numéro de référence LTC2942-1
Description 1A Battery Gas Gauge
Fabricant Linear Technology 
Logo Linear Technology 





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LTC2942-1 fiche technique
Features
n Indicates Accumulated Battery Charge and
Discharge
n SMBus/I2C Interface
n Integrated 50mΩ High Side Sense Resistor
n ±1A Sense Current Range
n High Accuracy Analog Integration
n ADC Measures Battery Voltage and Temperature
n Integrated Temperature Sensor
n 1% Voltage and Charge Accuracy
n Configurable Alert Output/Charge Complete Input
n 2.7V to 5.5V Operating Range
n Quiescent Current Less than 100µA
n Small 6-Pin 2mm × 3mm DFN package
Applications
n Low Power Handheld Products
n Cellular Phones
n MP3 Players
n Cameras
n GPS
LTC2942-1
1A Battery Gas Gauge with
Internal Sense Resistor and
Temperature/Voltage
Measurement
Description
The LTC®2942-1 measures battery charge state, battery
voltage and chip temperature in handheld PC and portable
product applications. Its operating range is perfectly
suited for single cell Li-Ion batteries. A precision coulomb
counter integrates current through an internal 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 ∆Σ
ADC. The three measured quantities (charge, voltage and
temperature) are stored in internal registers accessible via
the onboard SMBus/I2C interface.
The LTC2942-1 features programmable high and low
thresholds for all three measured quantities. If a pro-
grammed threshold is exceeded, the device communicates
an alert using either the SMBus alert protocol or by setting
a flag in the internal status register.
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.
Typical Application
CHARGER
I2C/SMBus
TO HOST
SENSE+
LTC2942-1
AL/CC
SDA
SENSE
SCL
GND
LOAD
0.1µF
+ 1-CELL
Li-Ion
29421 TA01a
Total Charge Error vs Sense Current
1.00
VSENSE+ = 3.6V
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
1
10 100
|ISENSE| (mA)
1000
29421 TA01b
29421f


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