Texas Instruments MSP430F6726IPN

Overview

MSP430F6726IPN 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, real-time clock with crystal offset calibration, and three eUSCI_A modules for UART/IrDA/SPI communication. It operates from 1.8 V to 3.6 V and delivers 265 µA/MHz active current at 8 MHz.

For engineers reviewing the MSP430F6726IPN datasheet, MSP430F6726IPN pinout, MSP430F6726IPN application, or MSP430F6726IPN equivalent, key selection criteria include its dual SD24_B ADC configuration (vs. three in F673x), 52 I/O count in 80-pin LQFP, RTC with temperature compensation, auxiliary supply support for backup subsystem, and compliance with ANSI C12.20 and IEC 62053 standards for metering accuracy.

Technical Context

The MSP430F6726IPN implements a 16-bit RISC CPU with extended memory addressing and constant generators for optimized code efficiency. Its unified clock system includes FLL stabilization, VLO and REFO internal sources, and 32-kHz XT1 crystal support - all enabling sub-3 µs wake-up from LPM3 standby mode.

Peripherals are tightly integrated for metrology: dual SD24_B ADCs provide high-resolution current/voltage sampling with differential PGA inputs and programmable gain; the 10-bit ADC handles auxiliary sensing (e.g., temperature); and the LCD_C module drives segmented displays without external bias circuitry via integrated contrast control.

Key Specifications

Pinout & Package

The MSP430F6726IPN is housed in an 80-pin LQFP (PN) package with 0.5-mm pitch, 12 mm × 12 mm body size, and exposed thermal pad. Pin functions follow TI's standard MSP430F672x IPN mapping, with dedicated analog inputs for SD24_B channels, AUXVCC supply pins for backup subsystem, and multiplexed I/O supporting meter-specific peripherals like optical couplers and relay drivers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power metrology microcontroller applications.

Compared with MSP430F6736IPN, the MSP430F6726IPN reduces ADC channel count but maintains identical timing, power, and communication capabilities - making it ideal for cost-optimized 2-wire meters. Against MSP430F6723IPN, it doubles flash/RAM for advanced firmware features like OTA updates and multi-tariff support without changing PCB layout.

Availability

MSP430F6726IPN is available at Aetrix Electronics and suitable for 2-wire single-phase metering, tamper-resistant utility meters, and smart grid endpoint nodes requiring stable component supply, long-term lifecycle support, and TI-qualified metrology-grade silicon.

Supply support for MSP430F6726IPN 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 and energy applications.

The MSP430F6726IPN belongs to TI's ultra-low-power metrology MCU product line, engineered specifically for ANSI/IEC-compliant electricity meters - emphasizing accuracy, security, long battery life, and integrated peripherals to minimize external components.

FAQ

What is the maximum system clock frequency supported by the MSP430F6726IPN?

The MSP430F6726IPN supports a maximum system clock frequency of 25 MHz, enabled by its digitally controlled oscillator (DCO) and FLL-based unified clock system. This allows high-speed execution of metrology algorithms such as FFT-based harmonic analysis and real-time tariff switching while maintaining ultra-low active-mode current of 265 µA/MHz at 8 MHz operation. The device achieves this performance within its 1.8 V to 3.6 V supply range.

Does the MSP430F6726IPN include a hardware RTC with temperature compensation?

Yes, the MSP430F6726IPN includes a password-protected real-time clock (RTC_C) module with crystal offset calibration and temperature compensation. It uses a 32.768-kHz external crystal (XT1) and achieves ±1 ppm accuracy over –25°C to +85°C. The RTC remains operational in LPM3.5 (1.24 µA) and LPM4.5 (0.78 µA) modes, and its registers are secured against unauthorized write access via password protection - critical for revenue-grade metering compliance.

How many 24-bit sigma-delta ADC channels does the MSP430F6726IPN integrate?

The MSP430F6726IPN integrates two independent 24-bit sigma-delta ADC modules (SD24_B), each with differential PGA inputs, programmable gain (1×–32×), and built-in digital filters. These are distinct from the third SD24_B channel found in the MSP430F673x series. Each SD24_B channel supports up to 4 input pairs and delivers >100-dB SNR - sufficient for simultaneous voltage and current measurement in Class 0.2 single-phase meters per ANSI C12.20.

What is the I/O count and package type of the MSP430F6726IPN?

The MSP430F6726IPN uses an 80-pin LQFP (PN) package with 12 mm × 12 mm body size and 0.5-mm pitch, providing 52 general-purpose I/O pins. These include multiplexed functions for timers, eUSCI modules, SD24_B inputs, and LCD segment/control lines. The pinout is identical to other MSP430F672xIPN variants, enabling design reuse across memory/configurations without PCB changes.

Can the MSP430F6726IPN drive an LCD display without external components?

Yes, the MSP430F6726IPN includes the LCD_C peripheral capable of driving up to 320 segments in 8-mux configuration with integrated contrast control. It requires only external capacitors (e.g., LCDCAP pin to DVSS) and no external bias generator or resistor network. The module supports static, 2-, 3-, and 4-mux modes, software-adjustable voltage bias, and automatic blinking - enabling full alphanumeric display support for utility meter user interfaces without added BOM cost.