Texas Instruments MSP430F6726IPNR

Overview

MSP430F6726IPNR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller designed for single-phase electronic watt-hour metering. It integrates two 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, RTC with crystal offset calibration, and three eUSCI_A modules (UART/IrDA/SPI) plus one eUSCI_B (I²C/SPI), operating from 1.8 V to 3.6 V with standby current as low as 1.7 µA.

For engineers reviewing the MSP430F6726IPNR datasheet, MSP430F6726IPNR pinout, MSP430F6726IPNR application, or MSP430F6726IPNR equivalent, key selection criteria include its dual SD24_B ADC architecture for metrology-grade current/voltage sampling, auxiliary supply support for backup subsystem operation, LQFP-80 package with 52 GPIOs, and integrated energy measurement peripherals enabling tamper-resistant meter designs without external coprocessors.

Technical Context

The MSP430F6726IPNR implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL, REFO, VLO, and XT1 (32-kHz crystal), and flexible power management with programmable LDO core regulation and multiple low-power modes (LPM3/LPM3.5/LPM4/LPM4.5). Its peripheral set is optimized for metering signal chain integrity: SD24_B converters support differential PGA inputs with 24-bit resolution and >100-dB SNR, while ADC10_A provides fast auxiliary sampling including on-chip temperature sensing.

Hardware acceleration includes a 32-bit hardware multiplier, 3-channel DMA, CRC16 engine, and dedicated port mapping controller. The device supports serial onboard programming via SBW interface and features password-protected RTC with temperature compensation - all within a single-chip solution targeting IEC 62053-compliant metering applications requiring high accuracy, long battery life, and secure timekeeping.

Key Specifications

Pinout & Package

Package: LQFP-80 (12 mm × 12 mm), RoHS-compliant, surface-mount. Pin count: 80 terminals with 52 general-purpose I/Os across Ports P1–P8 and PJ.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6726IPNR, the IPZ variant offers higher I/O count and third SD24_B channel in a larger package, while the IPN-based MSP430F6725IPN reduces RAM and omits one SD24_B channel - both maintain identical metrology-grade ADC performance, RTC functionality, and communication interfaces for drop-in compatibility in metering firmware stacks.

Availability

MSP430F6726IPNR is available at Aetrix Electronics and suitable for 2-wire single-phase metering, 3-wire single-phase metering, tamper-resistant meters, and smart grid endpoint nodes requiring stable component supply, long-term lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F6726IPNR 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 for industrial, automotive, and energy applications.

The MSP430F6726IPNR belongs to TI's MSP430F672x metering MCU family, engineered specifically for single-phase electricity meters requiring high-accuracy energy measurement, secure timekeeping, and ultra-low-power operation over 10+ year field lifetimes.

FAQ

What is the maximum system clock frequency supported by the MSP430F6726IPNR?

The MSP430F6726IPNR supports a maximum system clock frequency of 25 MHz, enabled by its digitally controlled oscillator (DCO) and FLL control loop. This frequency allows real-time execution of metrology algorithms including RMS calculation, harmonic analysis, and DLMS/COSEM protocol stack processing without external clock sources - all while maintaining ultra-low power consumption in active mode (265 µA/MHz at 8 MHz).

How many sigma-delta ADC channels does the MSP430F6726IPNR integrate?

The MSP430F6726IPNR integrates two independent 24-bit sigma-delta ADC modules (SD24_B), each supporting differential PGA inputs with selectable gains up to 32. These ADCs are specifically optimized for metrology applications, delivering >100-dB SNR and enabling simultaneous high-accuracy sampling of voltage and current waveforms - a key differentiator from the MSP430F673x series which includes three SD24_B channels.

Does the MSP430F6726IPNR support LCD display driving?

Yes, the MSP430F6726IPNR includes an integrated LCD_C controller capable of driving up to 320 segments in 8-mux mode with programmable contrast control. This eliminates the need for external display drivers in utility meters, reducing bill-of-materials cost and PCB complexity. The LCDCAP pin requires an external 2.2-µF capacitor to DVSS for stable charge-pump operation - omission results in display flicker or segment dropout.

What low-power modes are available on the MSP430F6726IPNR and their typical current consumption?

The MSP430F6726IPNR offers five low-power modes: LPM3 (1.7 µA @ 3.0 V with RTC active), LPM3.5 (1.24 µA @ 3.0 V with RTC only), LPM4 (1.6 µA @ 3.0 V), and LPM4.5 (0.78 µA @ 3.0 V). All retain full RAM content except LPM4.5, which preserves only backup RAM. These modes enable >10-year battery life in tamper-detection and timekeeping functions - critical for sealed meter deployments.

Is the MSP430F6726IPNR pin-compatible with other devices in the MSP430F672x family?

Yes, the MSP430F6726IPNR is pin-compatible with all other MSP430F672x variants in the 80-pin LQFP (PN) package, including MSP430F6725IPN and MSP430F6724IPN. Pin functions, power domains, and peripheral mappings match exactly - allowing firmware reuse and hardware scalability across memory and ADC channel configurations without PCB redesign.