Battery gas gauges target single-cell Li-Ion apps

The LTC2941/LTC2942 battery gas gauges have an I2C interface for 2.7 to 5.5V systems and are suited for single-cell Li-Ion applications such as mobile phones, cameras, MP3 players and GPS receivers. They use a continuous-time analogue integrator to measure charge directly, resulting in minimal offset and gain error, and better overall charge accuracy. The LTC2941 measures the charge flowing in and out of a battery to within one per cent accuracy at room temperature.

The LTC2942 does the same while also incorporating a 14-bit No Latency Delta; ADC to measure battery voltage and die temperature to within 1.3 per cent and +/-5C accuracy, respectively. Battery current is measured by monitoring the voltage across an external sense resistor and integrating this information to infer charge. A bidirectional analogue integrator accommodates either current polarity (battery charge or discharge) and a programmable prescaler allows for a range of battery capacities.

Charge, voltage, and temperature information is communicated to the host system over an I2C/SMBus-compatible two-wire interface that is also used to configure the gas gauge. The host can program high and low thresholds for all measured parameters that, if tripped, signal an alert using the SMBus Alert protocol or by setting a register flag. The LTC2941 and LTC2942 are offered in commercial and industrial versions, supporting operating temperature ranges from 0 to 70C and -40 to 85C, respectively. All devices are available in an RoHS-compliant, six-pin 2 x 3mm DFN package.

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