60V I²C battery monitor measures state-of-charge parameters to 1%
The LTC2944 is a true high voltage battery monitor that measures charge, voltage, current and temperature to 1% accuracy, the essential parameters required to accurately assess battery state of charge (SoC). Linear Technology suggests applications in electric vehicles, ebikes/motorcycles/scooters, wheelchairs, golf carts and battery backup systems.
Battery current is measured by monitoring the voltage across an external, high side sense resistor and integrating this information to infer charge. A bidirectional analogue integrator accommodates either current polarity (battery charge or discharge), and a programmable prescaler supports a wide range of battery capacities. 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. In a 8-pin 3 x 3 mm DFN package pricing starts at $2.85 (1,000).
Linear Technology; www.linear.com/product/LTC2944
next page; summary of features:
Measures accumulated battery charge & discharge
3.6V to 60V operating range for multicell applications
14-Bit ADC measures voltage, current & temperature
1% charge, voltage & current accuracy
±50mV sense voltage range
High side sense
I²C/SMBus interface
Configurable alert output/charge complete input
Quiescent current <150μA
8-pin 3 x 3 mm DFN package
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