Electric Vehicles Battery Monitor Offers 1% Accuracy!

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With a tremendous rise of electric vehicles and battery monitoring solutions available, Linear Technology is helping EV designers with a new multicell battery monitor, which makes direct measurements of 3.6V to 60V battery stacks of an electric vehicle. The LTC2944 is claimed to measure battery charge state, battery voltage, battery current and its own temperature to 1% accuracy, the essential parameters required to accurately assess battery state of charge (SoC).

The LTC2944 is ideal for multicell applications, including electric vehicles, ebikes/motorcycles/scooters, wheelchairs, golf carts and battery backup systems.

Absolutely no level shifting circuitry on the supply and measurement pins is required to interface with multicell voltages, so total current consumption is minimized and measurement accuracy is preserved.

Battery current is measured by monitoring the voltage across an external, high side sense resistor and integrating this information to infer charge. A bidirectional analog integrator accommodates either current polarity (battery charge or discharge), and a programmable prescaler supports a wide range of battery capacities.

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Charge, voltage, current and temperature information are communicated to the host system over an I²C/SMBus-compatible 2-wire interface that is also used to configure the battery monitor. The host can program high and low thresholds for all measured parameters, which if tripped, signal an alert using either the SMBus alert protocol or by setting a register flag.

The LTC2944 is offered in commercial and industrial versions, supporting operating temperature ranges from 0°C to 70°C and –40°C to 85°C, respectively.

The LTC2944 is available today in a small RoHS-compliant, 8-pin 3 x 3mm DFN package. Pricing starts at $2.85 each in 1,000-piece quantities. Please visit www.linear.com/product/LTC2944 for further product information.

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To view the full Press release, click here.

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