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ADI announces nanopower primary cell State-of-Health monitor

Analog Devices' LTC3337 is a nanopower primary (non-rechargeable) cell State-of-Health (SoH) monitor with precision coulomb counter.

The device is designed to be placed in series with a primary battery with minimal associated series voltage drop.

The patented infinite dynamic range coulomb counter tallies all accumulated battery discharge and stores it in an internal register accessible via an I2C interface. Quiescent current consumption is only 100nA helping to ncrease battery run time.

The LTC3337 integrates additional SoH variable monitoring which measures and reports via I2C: battery voltage, battery impedance, and temperature.

In order to accommodate a wide range of primary battery inputs, the peak input current limit is pin selectable from 5mA to 100mA. This enables the IC to present the battery with a load profile which allows it to deliver its maximum capacity, independent of the actual load. This is “battery friendly” and prolongs the lifetime of the cell.

The LTC3337 is suitable for primary cell applications that require only occasional power such as applications in remote locations, electronic door locks, or glass break detectors. The device may also be used in rechargeable battery cell applications.

Author
Neil Tyler

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