Texas Instruments MSP430F6733AIPNR

Overview

MSP430F6733AIPNR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering applications. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, and four enhanced universal serial communication interfaces (eUSCI_A0–A2, eUSCI_B0) in an 80-pin LQFP package with 64 KB Flash and 4 KB RAM.

For engineers reviewing the MSP430F6733AIPNR datasheet, MSP430F6733AIPNR pinout, MSP430F6733AIPNR application, or MSP430F6733AIPNR equivalent, key selection criteria include its triple SD24_B ADC architecture for simultaneous voltage/current/neutral measurement, RTC with crystal offset calibration, auxiliary supply subsystem for backup operation, and low-power modes down to 0.78 µA in LPM4.5 - critical for battery-backed utility meters.

Technical Context

The MSP430F6733AIPNR implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL stabilization, VLO and REFO internal sources, and XT1 32-kHz crystal support. Its power management includes a programmable LDO core regulator, supply voltage supervision, and dual auxiliary power rails (AUXVCC1–3) for isolated analog subsystem operation.

Peripherals are tightly integrated for metrology: SD24_B modules accept differential PGA inputs with programmable gain, ADC10_A provides six external channels plus temperature sensor, and the LCD_C module supports 8-mux contrast control. DMA enables autonomous data movement between ADCs and memory without CPU intervention, reducing active-mode time.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, exposed thermal pad (not electrically connected), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6734AIPNR, the MSP430F6733AIPNR trades Flash capacity for identical ADC/peripheral configuration and lower unit cost; versus MSP430F6723AIPNR, it adds a third SD24_B channel enabling full 3-wire single-phase measurement with neutral monitoring - critical for anti-tamper compliance.

Availability

MSP430F6733AIPNR is available at Aetrix Electronics and suitable for single-phase electronic watt-hour meters, utility grid sensor nodes, and smart energy monitoring gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for certification-critical deployments.

Supply support for MSP430F6733AIPNR 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 signal chains.

The MSP430F673xA family is engineered specifically for utility metering applications, integrating metrology-grade ADCs, RTC with crystal calibration, LCD drivers, and ultra-low-power operation to meet ANSI, IEC, and OIML standards for revenue-grade energy measurement.

FAQ

What is the maximum system clock frequency supported by the MSP430F6733AIPNR?

The MSP430F6733AIPNR supports a maximum system clock (MCLK) frequency of 25 MHz, enabled by its integrated FLL circuit that stabilizes the DCO output using either internal reference sources (REFO/VLO) or external crystals. This speed allows real-time execution of complex metrology algorithms including RMS, fundamental, and harmonic calculations without external co-processors - essential for meeting ANSI C12.20 Class 0.5 timing requirements within the MSP430F6733AIPNR's native instruction set.

Does the MSP430F6733AIPNR include hardware support for energy computation?

Yes, the MSP430F6733AIPNR includes a 32-bit hardware multiplier (MPY32) optimized for fixed-point arithmetic used in active/reactive/apparent power calculations. Combined with three independent SD24_B ADCs capable of simultaneous sampling and DMA-driven data transfer, the MSP430F6733AIPNR enables cycle-accurate energy integration without CPU intervention - reducing computational latency and improving measurement repeatability in the MSP430F6733AIPNR-based meter design.

How does the MSP430F6733AIPNR handle real-time clock accuracy over temperature and time?

The MSP430F6733AIPNR implements password-protected RTC with crystal offset calibration and temperature compensation, using internal temperature sensor readings to adjust the 32-kHz crystal frequency in real time. This achieves ±1 ppm accuracy over –40°C to 85°C, meeting IEC 62053-62 long-term stability requirements. The calibration parameters are stored in nonvolatile TLV memory and applied automatically on startup - a key differentiator of the MSP430F6733AIPNR versus generic RTC implementations.

Can the MSP430F6733AIPNR drive a large LCD display without external components?

Yes, the MSP430F6733AIPNR integrates the LCD_C peripheral supporting up to 320 segments in 8-mux configuration with programmable contrast control and internal charge pump. When paired with the LCDCAP pin and a 2.2-µF external capacitor, it generates boosted voltages up to 4.5 V - sufficient to drive high-contrast, wide-temperature-range LCDs used in outdoor utility meters without external bias generators or driver ICs, simplifying the MSP430F6733AIPNR-based bill-of-materials.

What communication interfaces are available on the MSP430F6733AIPNR for meter data retrieval?

The MSP430F6733AIPNR provides four eUSCI modules: three eUSCI_A peripherals supporting UART (with automatic baud-rate detection), IrDA, and SPI; and one eUSCI_B supporting I²C and SPI. This enables concurrent optical port (IrDA), RS-485 (UART), and secure element interfacing (I²C) - all directly supported by the MSP430F6733AIPNR without external level shifters or protocol translators, accelerating certification for DLMS/COSEM and ANSI C12.18 deployments.