Texas Instruments MSP430F6734AIPZR

Overview

MSP430F6734AIPZR 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 supporting up to 320 segments, and a real-time clock with crystal offset calibration - all in a 100-pin LQFP package operating from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F6734AIPZR datasheet, MSP430F6734AIPZR pinout, MSP430F6734AIPZR application, or MSP430F6734AIPZR equivalent, key selection criteria include its triple SD24_B ADC architecture, auxiliary supply support for RTC backup, low-power LPM3.5 mode (1.24 µA), and compatibility with single-phase watt-hour meter reference designs such as EVM430-F6736.

Technical Context

The MSP430F6734AIPZR 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 includes four eUSCI modules (three UART/IrDA/SPI-capable eUSCI_A and one I²C/SPI eUSCI_B), four 16-bit timers (one with three capture/compare registers, three with two each), and hardware multiplier for 32-bit operations.

It supports simultaneous high-resolution metrology sampling via three independent 24-bit SD24_B converters with differential PGA inputs, plus a dedicated 10-bit ADC with internal reference and temperature sensor channel - enabling concurrent voltage, current, and auxiliary measurement paths without external signal conditioning.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), body size 14 mm × 14 mm, with exposed thermal pad (not electrically connected). Features dedicated analog input banks (SD0P0/SD0N0 through SD2P0/SD2N0), separate AVCC/AVSS and DVCC/DVSS supplies, three AUXVCC pins for backup subsystem, and LCDCAP pin requiring DVSS tie when unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6735AIPZR and MSP430F6733AIPZR, the MSP430F6734AIPZR offers optimal balance of Flash (96 KB) for certified metrology firmware and communication stacks while maintaining identical analog performance, LCD capability, and low-power behavior across all LPM modes.

Availability

MSP430F6734AIPZR is available at Aetrix Electronics and suitable for single-phase electronic watt-hour meters, utility grid edge sensors, and portable power quality analyzers requiring stable component supply and long-term production continuity.

Supply support for MSP430F6734AIPZR 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 for industrial, automotive, and consumer applications.

The MSP430F673xA family is designed specifically for high-accuracy, ultra-low-power energy metering systems - integrating metrology-grade ADCs, RTC with crystal calibration, and LCD support in a single chip to replace discrete metering ASICs and microcontrollers.

FAQ

What is the maximum system clock frequency supported by the MSP430F6734AIPZR?

The MSP430F6734AIPZR supports a maximum system clock (MCLK) frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This allows real-time execution of metrology algorithms including RMS, fundamental, and harmonic calculations within strict sampling intervals. The device achieves wake-up from LPM3 in 3 µs (typical), ensuring responsive event handling without compromising low-power operation. All timing specifications for MSP430F6734AIPZR are validated across the full 1.8 V to 3.6 V supply range.

Does the MSP430F6734AIPZR include hardware support for metrology-specific calculations?

Yes, the MSP430F6734AIPZR includes a hardware multiplier (MPY32) capable of 32-bit operations, which accelerates fixed-point arithmetic used in RMS, active/reactive power, and harmonic analysis. Combined with three independent SD24_B ADCs and DMA-driven data transfer, it enables cycle-accurate computation without CPU intervention. The MSP430F6734AIPZR also features CRC16 hardware for checksum validation of calibration constants and firmware integrity checks - essential for revenue-grade meter certification.

How does the auxiliary supply system function in the MSP430F6734AIPZR?

The MSP430F6734AIPZR features a dedicated auxiliary supply domain with three AUXVCC pins (AUXVCC1–3) and separate VASYS rail, allowing the RTC, backup RAM (4 × 16 bits), and 32-kHz oscillator to remain operational during main supply failure. This design ensures continuous timekeeping and tamper-evident logging even when DVCC drops below brownout threshold. The MSP430F6734AIPZR enters LPM3.5 mode (1.24 µA at 3.0 V) to sustain this functionality - a key requirement for IEC 62053-compliant meters with battery backup.

Can the MSP430F6734AIPZR drive a 320-segment LCD without external components?

Yes, the MSP430F6734AIPZR integrates the LCD_C module with built-in charge pump, contrast control, and eight COM outputs (COM0–COM7), enabling direct drive of up to 320 segments in 8-mux configuration. The LCDCAP pin (Pin 29) must be connected to DVSS when unused to stabilize the internal charge pump. No external capacitors or bias generators are required, reducing bill-of-materials cost and PCB area - a verified capability confirmed in TI's EVM430-F6736 reference design using the MSP430F6734AIPZR.

What communication interfaces are available on the MSP430F6734AIPZR for utility metering standards?

The MSP430F6734AIPZR provides three eUSCI_A modules (supporting UART, IrDA, and SPI) and one eUSCI_B module (supporting I²C and SPI), enabling compliance with multiple utility communication standards. eUSCI_A0 supports automatic baud-rate detection for legacy optical probe interfaces; eUSCI_A1/A2 handle HART modem or RS-485 PHY connections; eUSCI_B0 manages secure EEPROM or metrology sensor I²C buses. All interfaces are independently clocked and DMA-capable - a configuration validated in TI's Energy Measurement Design Center for MSP430™ MCUs.