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MCU solution boasts energy, cost savings

Posted: 14 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:microcontroller? MCU solution? BOM saving?

Texas Instruments Inc. has released the MSP430FE42x2 microcontroller that reduces electronic bill of materials (EBOM) to the $1 range in high volumes for single-phase electricity metering (e-metering) applications.

MSP430FE42x2 MCUs integrate all metering functionality onto a single chip and offers ultralow power operation so that only simple voltage regulation is required for a complete solution.

The device features an embedded signal processor (ESP) peripheral that fully automates energy conversion by integrating two independent, high-resolution sigma-delta ADCs, programmable gain amplifiers, a temperature sensor, precision voltage reference, H/W multiplier and a dedicated fixed function MSP430 CPU.

The ESP provides 0.1 percent accurate energy measurement over a dynamic current range of 1000- to-1, surpassing the 1 percent accuracy common in typical meters today.

It also includes a second, fully-programmable on-chip MSP430 CPU for application processing and communication functions. An enhanced watchdog timer, brownout protection and a supply voltage supervisor are offered to increase system reliability.

In addition, the device has a 128 segment LCD driver, a three channel 16bit pulse width modulation timer, serial communication port and a basic timer for a real-time clock function provide all functionality for a complete meter implementation while saving board space, reducing development time and streamlining time-to-market.

The MSP430FE42x2 handles direct device operation from 3V supply with the CPU and ESP active at only 2.5mA. During a power outage, the device can operate in standby mode at 1.1?A with real-time clock function active. Ultra-low power can enable 10 and 20-year battery life in metering applications.

FE42x2 MCUs come in a 64-pin LQFP package, offer up to 32Kbyte of in-system programmable flash memory. FE42x2 MCUs are fully compatible with the $149 MSP-FET430U64 JTAG emulation toolkit, speeding development and time to market.

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