LTC2942

NOT RECOMMENDED FOR NEW DESIGNS

Battery Gas Gauge with Temperature, Voltage Measurement

Part Models: 4
1ku List Price: Starting From $1.83

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Part Details

Indicates Accumulated Battery Charge and Discharge
High Accuracy Analog Integration
ADC Measures Battery Voltage and Temperature
Integrated Temperature Sensor
High Side Sense
1% Voltage and Charge Accuracy
±50mV Sense Voltage Range
SMBus/I²C Interface
Configurable Alert Output/Charge Complete Input
2.7V to 5.5V Operating Range
Quiescent Current Less than 100μA
Small 6-Pin 2mm × 3mm DFN package

The LTC2942 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 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 ΔΣ^™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the on-board SMBus/I²C interface.

The LTC2942 features programmable high and low thresholds 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 resistor to set the measured current range.


	Integrated Sense Resistor
LTC2942	No
LTC2942-1	Yes

Applications

Low Power Handheld Products
Cellular Phones
MP3 Players
Cameras
GPS

Part Models: 4
1ku List Price: Starting From $1.83

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC2942CDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2942CDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2942IDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2942IDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Dec 22, 2023 - 23_0118 Production Discontinuation Of LTC2941 and LTC2942
		PDN23_0118_Form Material_Report
LTC2942CDCB#TRMPBF	LAST TIME BUY
LTC2942CDCB#TRPBF	LAST TIME BUY
LTC2942IDCB#TRMPBF	LAST TIME BUY
LTC2942IDCB#TRPBF	LAST TIME BUY

This is the most up-to-date revision of the Data Sheet.

Software Resources

Device Drivers 1

LTC294x GitHub Linux Driver Source Code NEW

Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Fuel Gauge and Coulomb Counter 2
LTC2942-1	Obsolete	1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement
LTC2943	PRODUCTION	Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
I²C Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power

Tools & Simulations

LTspice 1

LTC2942 - Battery Management

Models for the following parts are available in LTspice:

LTC2942
LTC2942-1

Linduino 3

Design Tool 1

LTC2941/LTC2942 - Calculator Tool

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

Purchase Linduino

Evaluation Kits

LTC2942 Demo Board | 2.7V to 5.5V Battery Gas Gauge Plus Voltage/Temperature Measurements, with I2C (Requires DC590)

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Product Details

Demonstration circuit 1496C-B features the LTC2942, a battery gas gauge that measures battery charge and discharge, battery voltage and chip temperature. The demo board includes an external 100mΩ (default) sense resistor for a maximum current measurement of 500mA (±50mV current sense voltage range). The sense resistor can be changed; however the software only accepts sense resistors between 0.1mΩ to 5Ω. The 2.7V to 5.5V operating range is perfectly suited for single cell Li-Ion batteries.

A precision analog coulomb counter integrates current through the sense resistor between the battery’s positive terminal and the load or charger. The LTC2942 adds battery voltage and on-chip temperature measurement with an internal 14-bit No Latency ΔΣ^™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the on-board SMBus/I²C interface.

Resources

DC1496C - Design Files
863.00K

DC1496C - Schematic
32.00K

DC1496C - Demo Manual
1.00M

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LTC2942

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Device Drivers 1

Product Selector Card 3

Software Resources

Device Drivers 1

Evaluation Software 0

Hardware Ecosystem

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

Linduino 3

Design Tool 1

Evaluation Kits

Product Details

Resources

Latest Discussions

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