Ultra-Low Power Battery Gas Gauge

The LTC2959 is an ultra-low power battery gas gauge that accurately measures charge, voltage, current and temperature. Its wide input voltage range and its low operating current make the LTC2959 suitable for many applications, including duty-cycled systems that operate over long lifetime.

A precision coulomb counter integrates current through an external sense resistor connected at any point in the battery current path. A 16-bit ADC can be configured to measure voltage, current, temperature and/or an auxiliary input in single-shot, duty-cycled (1S/52s) or continuous mode (2.5kS/s). The measurements are stored in internal registers accessible via the onboard I2C/SMBus interface.

The LTC2959 features programmable high and low thresholds and min/max tracking registers. If a threshold is exceeded, the device sets a flag in the internal status register and communicates an alert using the SMBus alert protocol when configured as such.

APPLICATIONS

* Remote Sensors

* Energy Harvesting Systems

* Low-Power Handheld Products

* Power Tools

* Operating Supply Current <1.0μA

* Supply Voltage from 1.8V to 60V

* 0V to 60V Sense Voltage for Low-Side or High-Side Sensing

* Fast 16-bit ADC Measures Voltage, Current and Temperature

* 1% Voltage, Current and Charge Accuracy

* No Crystal or other Time Reference Required

* Programmable Deadband Prevents Charge Drift