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Energy Meter with Integrated Sense Resistor Internal 30A/300µΩ Sense Resistor with 1.0% Current Accuracy Now it’s easy to digitally monitor the parameters required to accurately manage your system’s power profile or energy consumption. Current, voltage, power, charge and energy data are available via a simple I2C/SPI interface. The LTC ®2947 utilizes three ΔΣ ADCs to simultaneously measure current and voltage, and calculate power for true power readings. An integrated temperature-compensated sense resistor maximizes measurement accuracy over temperature and simplifies space-constrained designs. Features Monitors Current (1.0%), Voltage (0.5%), Power (1.2%), Charge (1.0%) and Energy (1.2%) nn Integrated 300µΩ Sense Resistor with ±30A Current Range and Low 9mA Offset nn 0V to 15V Rail-to-Rail Input Range nn Three ∆Σ ADCs for Instantaneous Multiplication of Voltage and Current nn Internal ±1% or External Time Bases nn Max and Min Value Tracking nn Alerts when Limits Exceeded nn I2C or SPI Configurable Interface Energy Measurement Total Unadjusted Error vs Current nn nn 32-Pin 4mm × 6mm QFN Package 0.5 INTERNAL CLOCK EXTERNAL CLOCK VDVCC = 12V 0.4 0.3 TUE (%) 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 0 10 20 ISENSE (A) L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 30 2947 TA01b At high current levels, power dissipation typically mandates the use of a low value sense resistor which also reduces input voltage signal. As a result, current measurement accuracy becomes susceptible to thermoelectric voltages and board layout. The LTC2947’s integrated temperature-compensated 300µΩ sense resistor is insensitive to such disturbances and provides low power dissipation and high accuracy across the entire operating range, producing a ±30A monitoring solution that is superior to external sense resistor solutions. CURRENT ADC POWER ADC VOLTAGE ADC LPF LPF CURRENT MEASUREMENT GAIN ERROR (%) Integrated Sense Resistor 1.00 0.75 0.50 0.25 0 –0.25 –0.50 –0.75 –1.00 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 Three ADCs The LTC2947 employs three ΔΣ ADCs to measure voltage, current and power. Instead of multiplying average values of current and voltage, the LTC2947 multiplies raw (pre-decimation filter) readings of current and voltage at a 5MHz sampling frequency, then converts the results. This technique enables the LTC2947 to accurately measure power in the presence of current and voltage variations up to 50kHz—far beyond its conversion frequency. This may happen when power is drawn from a battery with significant impedance, resulting in up to 10% more accurate power measurement results. LPF Demonstration System Quickly evaluate the LTC2947’s functions and performance with the simple DC2334 demonstration circuit and intuitive QuikEval™ PC software, or attach an available LCD keypad shield to run as a standalone power, charge and energy monitor without the need of a PC. Further minimize development time with complete driver code (written in C), schematics, bill of materials (BOM) and Gerber files. 15.000A 150.00W 10.000V 25.0 °C www.linear.com/2947 n 1-800-4-LINEAR 0716