Cell monitors battery discharge for health status
A nanopower primary (non-rechargeable) cell state-of-health (SoH) monitor by Analog Devices has a precision coulomb counter. The LTC3337 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 just 100nA, contributing to increase battery run time. The cell monitor integrates additional SoH variable monitoring battery voltage, battery impedance, and temperature status, which measures and reports via the I2C.
To accommodate a range of primary battery inputs, the peak input current limit is pin selectable from 5.0, 10, 15, 20, 25, 50, 75 and 100mA. Input range is 1.8 to 5.5V. 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, says the company, is “battery friendly” and prolongs the lifetime of the cell. The LTC3337 can be used for primary cell applications that require only occasional power such as applications in remote locations, electronic door locks, or glass break detectors.
The cell can be used in rechargeable battery cell applications. and are available now in a 12-lead 2.0 x 2.0mm LFCSP.
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Panasonic PhotoMOS® Photovoltaic MOSFET High-Power Drivers
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