Texas Instruments MSP430F6725AIPNR

Overview

MSP430F6725AIPNR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering applications. It integrates two 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, three eUSCI_A modules (UART/IrDA/SPI), one eUSCI_B module (I²C/SPI), and a real-time clock with crystal offset calibration - all operating from 1.8 V to 3.6 V supply.

For engineers reviewing the MSP430F6725AIPNR datasheet, MSP430F6725AIPNR pinout, MSP430F6725AIPNR application, or MSP430F6725AIPNR equivalent, key selection criteria include its dual SD24_B ADC architecture for current/voltage channel separation, LQFP-80 package with 52 GPIOs, RTC-backed metering accuracy, and integrated auxiliary supply system for backup subsystem operation.

Technical Context

The MSP430F6725AIPNR 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 power management supports five low-power modes including LPM3.5 (1.24 µA RTC-active) and LPM4.5 (0.78 µA shutdown), enabling multi-year battery life in portable metering.

Peripherals are tightly coordinated for metrology: SD24_B converters use differential PGA inputs with internal reference, ADC10_A provides temperature sensing and auxiliary analog monitoring, and the LCD_C module includes integrated contrast control and charge pump - all synchronized via DMA and timer-A resources without CPU intervention.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, standard JEDEC footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6724AIPNR, the MSP430F6725AIPNR offers greater flash headroom for secure bootloader and calibration storage; versus MSP430F6726AIPNR, it trades one SD24_B channel for lower cost and power in single-phase-only deployments.

Availability

MSP430F6725AIPNR is available at Aetrix Electronics and suitable for smart electricity metering, utility grid sensor nodes, and portable power quality analyzers requiring stable component supply, long-term lifecycle support, and TI-qualified metrology-grade silicon.

Supply support for MSP430F6725AIPNR 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 leader delivering analog and embedded processing solutions for industrial, automotive, and consumer applications.

The MSP430F6725AIPNR belongs to TI's ultra-low-power metrology MCU product line, engineered specifically for ANSI C12.20 and IEC 62053-compliant energy measurement systems with integrated analog front-end precision and secure timekeeping.

FAQ

What is the maximum sampling rate supported by the SD24_B ADCs in the MSP430F6725AIPNR?

The MSP430F6725AIPNR's SD24_B ADCs support up to 256 kSPS aggregate throughput across both channels when configured for 16-bit resolution with oversampling disabled. At 24-bit resolution, typical effective sampling rates range from 1.2 kSPS to 8 kSPS depending on filter type and decimation ratio - sufficient for 50/60 Hz fundamental and harmonic analysis per IEC 61000-4-30 Class A requirements.

Does the MSP430F6725AIPNR support direct connection to shunt resistors or current transformers?

Yes, the MSP430F6725AIPNR supports direct interface to both shunt resistors and current transformers via its SD24_B ADC differential inputs (SD0P0/SD0N0 and SD1P0/SD1N0), which feature programmable gain amplifiers with 1×, 2×, 4×, 8×, 16×, 32×, and 64× settings and rail-to-rail input ranges referenced to AVSS/AVCC - enabling ±100 mV to ±2.5 V differential signal acquisition without external op-amps.

How does the auxiliary supply system in the MSP430F6725AIPNR improve meter reliability?

The MSP430F6725AIPNR's auxiliary supply system powers the RTC, backup RAM, and 32-kHz oscillator from dedicated AUXVCC1–AUXVCC3 rails, allowing continuous timekeeping and data retention during main supply interruption. This architecture ensures accurate outage duration logging, tamper-evident timestamping, and seamless resumption of metrology functions upon power restoration - meeting ANSI C12.1 and IEC 62053-21 fault-tolerant requirements.

Can the MSP430F6725AIPNR drive a 4×32 segment LCD without external components?

Yes, the MSP430F6725AIPNR's LCD_C module drives up to 320 segments in 8-mux configuration using only internal charge pump and contrast control circuitry. No external capacitors, resistors, or bias generators are required - reducing BOM count and PCB area while maintaining display visibility across –40°C to +85°C operating temperature.

What debug interface does the MSP430F6725AIPNR use, and is JTAG supported?

The MSP430F6725AIPNR uses the Spy-Bi-Wire (SBW) interface for debugging and programming, accessible via TEST/SBWTCK and RST/NMI/SBWTDIO pins. Full 4-wire JTAG is not supported; however, SBW provides equivalent functionality including breakpoint setting, register inspection, and flash programming - with minimal pin count and compatibility with TI's MSP-FET and LaunchPad development tools.