Texas Instruments MSP430F6734AIPZ

Overview

MSP430F6734AIPZ from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for precision energy metering applications. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver (up to 320 segments), real-time clock with crystal offset calibration, and four enhanced USCI modules (three UART/IrDA/SPI + one I²C) in a 100-pin LQFP package. It operates from 1.8 V to 3.6 V and supports single-phase electronic watt-hour metering with integrated metrology peripherals.

For engineers reviewing the MSP430F6734AIPZ datasheet, MSP430F6734AIPZ pinout, MSP430F6734AIPZ application, or MSP430F6734AIPZ equivalent, key selection criteria include its triple 24-bit SD24_B ADC architecture, auxiliary supply subsystem for RTC backup, low-power LPM3.5 mode (1.24 µA), and 96 KB flash / 4 KB RAM configuration optimized for certified meter firmware and long-life battery-backed operation.

Technical Context

The MSP430F6734AIPZ implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL stabilization, VLO/REFO/XT1 sources, and programmable LDO core regulation. Its peripheral set centers on metrology-grade signal acquisition: three independent 24-bit sigma-delta ADCs with differential PGA inputs support simultaneous voltage/current/neutral channel sampling, while the 10-bit ADC provides auxiliary sensing (temperature, supply rails).

Power management includes five low-power modes (LPM0–LPM4.5), with sub-µA shutdown (LPM4.5 = 0.78 µA) and RTC-active standby (LPM3.5 = 1.24 µA at 3.0 V). The device uses separate analog (AVCC/AVSS) and digital (DVCC/DVSS) supplies, plus dedicated AUXVCC pins and VASYS/VDSYS for isolated backup subsystem operation - critical for tamper-resilient meter designs meeting IEC 62053 and ANSI C12 standards.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, standard JEDEC footprint with exposed thermal pad (not electrically connected). Pinout validated per TI SLASE46A Rev. October 2018, Figure 4-1 and Table 4-3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metrology microcontroller applications.

Compared with MSP430F6734AIPZ, the MSP430F6735AIPZ offers identical metrology capability with matching memory partitioning, while the MSP430F6736AIPZ provides scalable flash/RAM headroom for advanced firmware features - all share pin-compatible packaging and peripheral register mapping.

Availability

MSP430F6734AIPZ is available at Aetrix Electronics and suitable for single-phase energy metering, utility data loggers, and industrial power quality analyzers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430F6734AIPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in low-power microcontrollers and precision analog signal chains.

The MSP430F673xA product line targets certified electricity metering applications, integrating metrology-grade ADCs, RTC, LCD, and communication peripherals into a single ultra-low-power SoC to simplify design certification and reduce bill-of-materials cost.

FAQ

What is the maximum system clock frequency supported by the MSP430F6734AIPZ?

The MSP430F6734AIPZ supports a maximum system clock (MCLK) frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This speed allows real-time execution of metrology algorithms-including RMS, fundamental power, and harmonic analysis-while maintaining compatibility with the device's ultra-low-power architecture and active-mode current specification of 265 µA/MHz at 8 MHz.

Does the MSP430F6734AIPZ include hardware support for metrology-specific calculations?

Yes, the MSP430F6734AIPZ includes a 32-bit hardware multiplier (MPY32) that accelerates fixed-point arithmetic essential for metrology functions such as RMS voltage/current, active/reactive power, and THD computation. Combined with three independent 24-bit sigma-delta ADCs and DMA-driven data transfer, this enables deterministic, low-latency processing without CPU intervention - critical for meeting IEC 62053 real-time sampling requirements.

How does the MSP430F6734AIPZ handle power supply failures during RTC operation?

The MSP430F6734AIPZ uses a dedicated auxiliary supply subsystem with AUXVCC pins and VASYS/VDSYS connections to maintain RTC operation during main supply failure. In LPM3.5 mode, it draws only 1.24 µA at 3.0 V while sustaining the 32-kHz crystal-based RTC, backup RAM (4 × 16 bits), and crystal offset calibration - ensuring accurate timekeeping and tamper-evident logging even during extended mains outages.

Can the MSP430F6734AIPZ drive a segment LCD display without external components?

Yes, the MSP430F6734AIPZ integrates the LCD_C module capable of driving up to 320 segments in 8-mux configuration using an internal charge pump. It requires only a single external 2.2 µF capacitor on the LCDCAP/R33 pin to generate the necessary bias voltages - eliminating the need for external LCD drivers or voltage boosters and reducing total solution size and cost in space-constrained meter designs.

What communication interfaces are available on the MSP430F6734AIPZ for smart meter connectivity?

The MSP430F6734AIPZ provides four enhanced USCI modules: eUSCI_A0, eUSCI_A1, and eUSCI_A2 support UART, IrDA, and SPI; eUSCI_B0 supports I²C and SPI. This enables concurrent implementation of optical port (IrDA), PLC/RS-485 (UART), and home area network (I²C to Wi-Fi/BLE module) - satisfying DLMS/COSEM, ANSI C12.22, and EN 13757-3 protocol stacks within a single chip.