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Ultralow-power MCUs suit e-metering apps

Posted: 03 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:microcontroller? MCU? e-metering application?

Texas Instruments Inc. has introduced ultralow power MSP430F471xx microcontroller series in support of three-phase e-metering applications. The F471xx SoC metering solution offers simultaneous sampling of voltage and current as well as tamper-detection for efficient and reliable energy measurement.

Three-phase energy metering is really made possible with the six (or seven) 16bit sigma-delta converters. Below is a diagram of how the seven converters (the seventh on the neutral wire) and the MSP430 can provide a full three-phase monitoring solution.

Key features and benefits of the MSP430F471xx three-phase e-metering MCU include:

??Integrated MCU solution with dedicated 16bit sigma delta converters for three-phase e-metering applications

??Precise energy measurements with better than 0.1 percent accuracy

??Well suited for power-line monitoring with simultaneous sampling of all channels

??Ultralow power consumption when LCD, real-time clock and other peripherals are in use, helps maintain data when back-up battery is used during power outage

??Support of tamper detection and high-precision measurements like temperature and humidity with 7th sigma delta converter for measurement of current and voltage signals

??Flexible memory options with up to 120Kbyte flash and 8Kbyte RAM

??Development made easy with code examples, evaluation module and application note that details faster calibration to jump-start design.

F471xx MCUs are priced between $5.75 and $7.95 for 1K units and are available now along with the $75 MSP-TS430PZ100A target board. In addition, these devices are fully compatible with the $149 MSP-FET430U100A flash emulation tool and e-meter EVM (available via local sales support).

- Steve Bitton
Industrial Control Designline

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