Texas Instruments MSP430F6721IPNR

Overview

MSP430F6721IPNR 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 (up to 320 segments), real-time clock with crystal offset calibration, and three eUSCI_A modules supporting UART/IrDA/SPI. It operates from 1.8 V to 3.6 V and supports tamper-resistant metering applications.

For engineers reviewing the MSP430F6721IPNR datasheet, MSP430F6721IPNR pinout, MSP430F6721IPNR application, or MSP430F6721IPNR equivalent, this page delivers verified specifications, package mapping, functional pin roles, metering-specific use cases, and validated alternative parts - all aligned to TI's SLAS731D production data sheet (Rev. September 2018).

Technical Context

The MSP430F6721IPNR implements a 16-bit RISC CPU with 25-MHz system clock capability, flexible power management including programmable LDO and multiple low-power modes (LPM3.5 at 1.24 µA, LPM4.5 at 0.78 µA), and a unified clock system with FLL, REFO, VLO, and 32-kHz XT1 support. Its auxiliary supply subsystem powers RTC, backup memory, and low-frequency oscillator independently.

It features three 16-bit Timer_A modules (one with 3 capture/compare registers, two with 2 each), hardware multiplier, 3-channel DMA, and dedicated SD24_B peripheral with differential PGA inputs for precision metrology-grade current/voltage sensing in energy measurement systems.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm, surface-mount. Pin functions conform to TI SLAS731D Rev. September 2018, Table 4-2 (MSP430F672xIPN).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6721IPNR, MSP430F6723IPNR offers scalable firmware headroom while maintaining pin compatibility, whereas MSP430F6721IPZ provides metrology channel expansion and I/O headroom at the cost of larger footprint and higher component count.

Availability

MSP430F6721IPNR is available at Aetrix Electronics and suitable for 2-wire metering, tamper-resistant utility endpoints, and smart grid edge nodes requiring stable component supply, long-term lifecycle assurance, and TI-qualified metrology performance.

Supply support for MSP430F6721IPNR 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 MSP430F672x product line is engineered specifically for revenue-grade electricity metering, integrating metrology-grade ADCs, RTC, LCD, and ultra-low-power operation to meet IEC 62053 and ANSI C12 standards.

FAQ

What is the maximum system clock frequency supported by the MSP430F6721IPNR?

The MSP430F6721IPNR supports a maximum system clock frequency of 25 MHz, enabled by its digitally controlled oscillator (DCO) and FLL-based clock stabilization. This allows high-speed execution of metrology algorithms such as RMS, harmonic analysis, and energy accumulation while maintaining sub-1-µs timer resolution for pulse counting in utility billing applications. The 25-MHz capability is confirmed in Section 1.1 of TI's SLAS731D datasheet.

Does the MSP430F6721IPNR include integrated LCD driving capability?

Yes, the MSP430F6721IPNR integrates the LCD_C peripheral supporting up to 320 segments in 8-mux configuration, with programmable contrast control and internal charge pump. This eliminates the need for external LCD driver ICs in single-phase meter front panels. The LCDCAP pin (Pin 26) must be connected to DVSS if unused, as specified in TI's SLAS731D Section 4.1.

How many sigma-delta ADC channels does the MSP430F6721IPNR provide?

The MSP430F6721IPNR provides two independent 24-bit sigma-delta ADC modules (SD24_B), each with differential PGA inputs and dedicated modulator clock/data interfaces. Unlike the MSP430F673x series, it does not implement SD2P0/SD2N0 pins (marked NC in Table 4-2), confirming exactly two active SD24_B channels - sufficient for voltage and current measurement in Class 0.5 single-phase meters per IEC 62053-21.

What low-power modes are available on the MSP430F6721IPNR, and what are their typical currents?

The MSP430F6721IPNR supports five low-power modes: LPM3 (1.7 µA @ 2.2 V), LPM3.5 (1.24 µA @ 3.0 V), LPM4 (1.6 µA @ 3.0 V), and LPM4.5 (0.78 µA @ 3.0 V). LPM3.5 maintains RTC operation with crystal; LPM4.5 shuts down all clocks except SVS. These values are measured under typical conditions per TI SLAS731D Section 1.1 and enable >10-year battery life in standby metering applications.

Is the MSP430F6721IPNR pin-compatible with other devices in the MSP430F672x family?

Yes, the MSP430F6721IPNR is fully pin-compatible with all 80-pin LQFP variants in the MSP430F672x family (e.g., MSP430F6723IPNR, MSP430F6725IPNR) as defined in TI SLAS731D Table 4-2. Pin functions, power domains, and peripheral mappings are identical across the PN package group; only Flash/RAM size and SD24_B channel count differ - enabling drop-in upgrades without PCB revision.