Texas Instruments MSP430F6733AIPZ

Overview

MSP430F6733AIPZ from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for precision energy metering applications. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, and a real-time clock with crystal offset calibration - all in a 100-pin LQFP package operating from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F6733AIPZ datasheet, MSP430F6733AIPZ pinout, MSP430F6733AIPZ application, or MSP430F6733AIPZ equivalent, key selection criteria include its 64 KB Flash/4 KB RAM configuration, triple SD24_B ADC support for polyphase current/voltage sensing, low-power RTC operation down to 1.24 µA (LPM3.5), and compatibility with single-phase electronic watt-hour meter reference designs.

Technical Context

The MSP430F6733AIPZ 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 architecture includes an integrated LDO with programmable core voltage, dual auxiliary supply rails (AUXVCC1–3), and dedicated backup subsystem for RTC and 4×16-bit backup memory.

Peripherals are optimized for metrology: three independent SD24_B modules accept differential PGA inputs for simultaneous voltage/current channel measurement; eUSCI_A0–A2 provide UART/IrDA/SPI with automatic baud-rate detection; eUSCI_B0 supports I²C with multi-addressing; and four 16-bit timers (one with 3 CC registers, three with 2 each) enable precise pulse-width and time-interval capture in metering firmware.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, standard JEDEC footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6734AIPZ and MSP430F6735AIPZ, the MSP430F6733AIPZ offers optimal balance of metrology performance and cost for Class 0.5S single-phase meters where 64 KB Flash suffices for certified firmware, reducing BOM cost while retaining full ADC, RTC, and LCD capabilities.

Availability

MSP430F6733AIPZ is available at Aetrix Electronics and suitable for single-phase electronic watt-hour meters, energy monitoring gateways, and utility grid sensor nodes requiring stable component supply, long-term lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F6733AIPZ 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 leader delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The MSP430F673xA family is engineered specifically for high-accuracy energy measurement systems, integrating metrology-grade ADCs, low-power RTC, and LCD drivers to eliminate external components in revenue-grade meter designs.

FAQ

What is the maximum system clock frequency supported by the MSP430F6733AIPZ?

The MSP430F6733AIPZ supports a maximum system clock (MCLK) frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This speed allows real-time execution of complex metrology algorithms-including RMS, fundamental/ harmonic power, and THD calculations-while maintaining ultra-low power consumption in active mode (265 µA/MHz at 8 MHz, 3.0 V). The device achieves 3-µs wake-up from standby mode, ensuring responsive event handling without sacrificing efficiency.

Does the MSP430F6733AIPZ include hardware support for energy calculation standards like IEC 62053?

Yes, the MSP430F6733AIPZ provides hardware and firmware-enabling features aligned with IEC 62053-21 and -22 for Class 0.5S meters. Its three independent 24-bit sigma-delta ADCs support simultaneous sampling of voltage and current channels with programmable gain amplifiers, enabling high-accuracy active/reactive energy accumulation. The integrated hardware multiplier (MPY32) accelerates RMS and power computations, while the password-protected RTC with crystal offset calibration ensures time-stamped billing compliance. TI's Energy Measurement Design Center supplies validated firmware libraries for IEC-compliant implementations using the MSP430F6733AIPZ.

How many LCD segments can the MSP430F6733AIPZ drive, and what mux configurations are supported?

The MSP430F6733AIPZ integrates an LCD_C module capable of driving up to 320 segments in 8-mux mode. It provides eight COM outputs (COM0–COM7) and supports segment mapping across Ports P1–P8 and PJ. The controller includes software-configurable contrast control, charge pump, and blinking functionality - eliminating the need for external LCD bias circuitry. This capability enables full-feature displays for utility meters (e.g., kWh, tariff, voltage, tamper status) without adding discrete components or increasing PCB area.

What are the key low-power modes available on the MSP430F6733AIPZ, and their typical current draw?

The MSP430F6733AIPZ offers five defined low-power modes: LPM3 (1.7 µA at 2.2 V) retains full RAM and runs RTC with crystal; LPM4 (1.6 µA at 3.0 V) shuts down all clocks except supply supervisor; LPM3.5 (1.24 µA at 3.0 V) maintains RTC operation with crystal while powering down core logic; LPM4.5 (0.78 µA at 3.0 V) is deepest shutdown with RAM retention; and active mode consumes 265 µA/MHz at 8 MHz, 3.0 V. These modes are controlled via the PMM module and support fast 3-µs wake-up, making the MSP430F6733AIPZ ideal for battery-backed metering applications requiring decade-long operation.

Can the MSP430F6733AIPZ support multiple communication interfaces simultaneously, such as UART and I²C?

Yes, the MSP430F6733AIPZ integrates four enhanced universal serial communication interfaces: three eUSCI_A modules (supporting UART, IrDA, and SPI) and one eUSCI_B module (supporting I²C and SPI). All operate concurrently - for example, eUSCI_A0 can handle optical port communication (IEC 62056-21), eUSCI_A1 can manage RS-485 M-Bus, and eUSCI_B0 can interface with external EEPROM or security ICs via I²C. Pin multiplexing is fully configurable via port mapping controller, allowing flexible routing without hardware redesign.