Nanopower Primary Cell With Precision Coulomb Counter

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It measures and reports via I2C the battery voltage, battery impedance and temperature to maximise the cell output capacity

Designed to be placed in series with a primary battery having minimal series voltage drop, the LTC3337, a nanopower primary (non-rechargeable) cell State-of-Health (SoH) monitor with precision coulomb counter by Analog Devices, Inc. accumulates all battery discharge and stores it in an internal register accessible via an I2C interface. Quiescent current consumption is only 100nA that increases battery run time.

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The LTC3337 integrates additional SoH variable monitoring, which measures and reports via I2C the battery voltage, battery impedance and temperature. To accommodate a wide range of primary battery inputs, the peak input current limit is pin selectable from 5mA to 100mA. This also allows the IC to deliver its maximum capacity, independent of the actual load. 

Key Features

• Battery Input Voltage Range: 1.8V to 5.5V
• 100nA Quiescent Current
• 8 Primary Battery Peak Input Current Limits: 5mA/10mA/15mA/20mA/25mA/50mA/75mA/100mA
• SoH Monitor for Primary Battery: Integrated Coulomb Counter (Q) Additional Monitors for Battery Voltage (V), Battery Impedance (Z) and Temperature (T)

The LTC3337 is now available at Analog Devices in a 12-lead 2mm x 2mm LFCSP package.