Description 

The TI MSP430™ family of ultra-low-power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows the device to wake up from lowpower modes to active mode in less than 6 µs. The MSP430FE42x series are microcontroller configurations with three independent 16-bit sigma-delta ADCs and an embedded signal processor core used to measure and calculate single-phase energy in both 2-wire and 3-wire configurations. Also included are a built-in 16-bit timer, 128-segment LCD drive capability, and 14 I/O pins. Typical applications include 2-wire and 3-wire single-phase metering including tamper-resistant meter implementations.

Applications

• 2-Wire and 3-Wire Single-Phase Meters

• Tamper-Resistant Meters

Features

 • Low Supply Voltage Range: 2.7 V to 3.6 V 

• Ultra-Low Power Consumption: – Active Mode: 400 µA at 1 MHz, 3 V – Standby Mode: 1.6 µA – Off Mode (RAM Retention): 0.1 µA 

• Five Power-Saving Modes 

• Wake up From Standby Mode in Less Than 6 µs 

• Frequency-Locked Loop, FLL+ 

• 16-Bit RISC Architecture, 125-ns Instruction Cycle Time 

• Embedded Signal Processing for Single-Phase Energy Metering With Integrated Analog Front End and Temperature Sensor (ESP430CE1) 

• 16-Bit Timer_A With Three Capture/Compare Registers 

• Integrated LCD Driver for 128 Segments 

• Serial Communication Interface (USART), Asynchronous UART or Synchronous SPI Selectable by Software