Texas Instruments MSP430F6720IPNR

Overview

MSP430F6720IPNR 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 with temperature sensor, LCD driver supporting up to 320 segments, and three eUSCI_A modules for UART/IrDA/SPI plus one eUSCI_B for I²C/SPI - all operating from 1.8 V to 3.6 V supply.

For engineers reviewing the MSP430F6720IPNR datasheet, MSP430F6720IPNR pinout, MSP430F6720IPNR application, or MSP430F6720IPNR equivalent, key selection criteria include its dual SD24_B ADC configuration, 16 KB Flash/1 KB RAM memory footprint, LQFP-80 package with 52 GPIOs, RTC with crystal offset calibration, and support for tamper-resistant metering architectures requiring low-power standby (1.7 µA in LPM3) and fast wake-up (3 µs).

Technical Context

The MSP430F6720IPNR implements a 16-bit RISC CPU with extended memory addressing and constant generators for code efficiency. Its unified clock system includes FLL stabilization, VLO and REFO internal sources, and 32-kHz XT1 crystal support - enabling precise timekeeping and low-jitter sampling for energy measurement.

Power management integrates a programmable LDO core regulator, supply voltage supervision (SVS), brownout reset (BOR), and auxiliary supplies (AUXVCC1–3) dedicated to backup subsystems including RTC, 32-kHz oscillator, and 4×16-bit backup RAM - ensuring metrology accuracy during main power interruptions.

Key Specifications

Pinout & Package

The MSP430F6720IPNR is housed in an 80-pin LQFP (PN) package with exposed thermal pad, optimized for metering PCB layouts requiring EMI resilience and thermal stability. Pin functions are fully mappable across Ports P1–P6, PJ, and P9, with dedicated analog inputs for SD24_B channels and auxiliary supply rails (AUXVCC1–3) isolated from main DVCC/AVCC domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6720IPNR, MSP430F6721IPN and MSP430F6723IPN retain identical metrology accuracy, low-power behavior, and pin compatibility while scaling Flash/RAM to accommodate evolving utility firmware requirements - making them drop-in upgrades for design refreshes without PCB revision.

Availability

MSP430F6720IPNR 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 assurance, and TI-authorized traceability.

Supply support for MSP430F6720IPNR 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 markets with emphasis on power efficiency and signal integrity.

The MSP430F6720IPNR belongs to TI's ultra-low-power metering MCU product line, engineered specifically for ANSI/IEC-compliant electricity meters where sub-µA standby current, integrated SD24_B ADCs, and secure RTC functionality are mandatory design requirements.

FAQ

What is the maximum system clock frequency supported by the MSP430F6720IPNR?

The MSP430F6720IPNR supports a maximum system clock frequency of 25 MHz, enabled by its digitally controlled oscillator (DCO) and FLL-based clock stabilization circuitry. This allows real-time execution of metrology algorithms and communication stacks while maintaining deterministic timing for sigma-delta ADC sampling synchronization. The device achieves this performance within its 1.8 V to 3.6 V operating range without external clock sources.

Does the MSP430F6720IPNR include hardware support for cryptographic operations?

The MSP430F6720IPNR does not integrate dedicated cryptographic accelerators such as AES or SHA engines. Its security features are focused on metrology integrity: password-protected RTC registers, tamper-detectable backup RAM, and secure bootloader (BSL) with UART-based firmware update authentication. For applications requiring FIPS-compliant encryption, external co-processors or software-based libraries must be implemented.

How many SD24_B ADC channels does the MSP430F6720IPNR provide, and what is their resolution?

The MSP430F6720IPNR provides two independent 24-bit sigma-delta ADC channels (SD24_B), each supporting differential input pairs (SD0P0/SD0N0 and SD1P0/SD1N0) with programmable gain amplifier (PGA) stages. These converters operate at up to 128 samples per second with built-in digital filtering and are calibrated for metrology-grade linearity - meeting ANSI C12.20 Class 0.5 accuracy requirements when used with appropriate external sensors.

What is the function of the AUXVCC1, AUXVCC2, and AUXVCC3 pins on the MSP430F6720IPNR?

The AUXVCC1, AUXVCC2, and AUXVCC3 pins on the MSP430F6720IPNR supply isolated power to the backup subsystem, including the 32-kHz low-frequency oscillator (XT1), real-time clock (RTC_C), and 4×16-bit backup RAM. This dedicated rail ensures continuous timekeeping and tamper-event logging during main power failure or brownout conditions - a critical requirement for revenue-grade metering compliance under IEC 62055-41.

Can the MSP430F6720IPNR drive a segment LCD display directly without external components?

Yes, the MSP430F6720IPNR integrates the LCD_C controller capable of driving up to 320 segments in 8-mux configuration with on-chip contrast control voltage generation. No external capacitors, resistors, or charge pumps are required for basic operation. The LCDCAP pin must be tied to DVSS if unused, and segment/common outputs are directly routable to display glass - simplifying design and reducing BOM cost for utility meter displays.