LTC2942
ObsoleteBattery Gas Gauge with Temperature, Voltage Measurement
Overview
- 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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 2
Product Selector Card 3
Device Drivers 1
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Monitors & Fuel Gauges 2 | ||
| LTC2942-1 | Obsolete | 1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement |
| LTC2943 | NOT RECOMMENDED FOR NEW DESIGNS | Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement |
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Interface Transceivers 1 | ||
| LTM2883 | PRODUCTION | SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC2942
- LTC2942-1
Linduino 3
Design Tool 1
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.
Evaluation Kits
LTC2942 Demo Board | 2.7V to 5.5V Battery Gas Gauge Plus Voltage/Temperature Measurements, with I2C (Requires DC590)