Texas Instruments MSP430F6733AIPN

Overview

MSP430F6733AIPN 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 real-time clock with crystal offset calibration - all in an 80-pin LQFP package operating from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F6733AIPN datasheet, MSP430F6733AIPN pinout, MSP430F6733AIPN application, or MSP430F6733AIPN equivalent, key selection criteria include its 64 KB Flash/4 KB RAM configuration, 3-channel 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 watt-hour meter reference designs like EVM430-F6736.

Technical Context

The MSP430F6733AIPN implements a 16-bit RISC CPU with 25-MHz system clock capability and flexible power management including integrated LDO, supply voltage supervision, and dual auxiliary power supplies. Its unified clock system features FLL stabilization, VLO and REFO internal sources, and 32-kHz crystal support for RTC.

Peripherals include four 16-bit timers (one with three capture/compare registers, three with two each), three eUSCI_A modules supporting UART/IrDA/SPI, one eUSCI_B module for I²C/SPI, hardware multiplier, 3-channel DMA, and dedicated backup subsystem with separate voltage supply for RTC and 4×16-bit backup memory.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6734AIPN, the MSP430F6733AIPN trades Flash capacity for identical metrology performance and lower unit cost; compared with MSP430F6723AIPN, it adds a third SD24_B ADC channel enabling full 3-wire single-phase + neutral measurement without external multiplexing.

Availability

MSP430F6733AIPN is available at Aetrix Electronics and suitable for single-phase watt-hour meters, utility data loggers, and portable power quality analyzers requiring stable component supply across multi-year production cycles.

Supply support for MSP430F6733AIPN 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 applications.

The MSP430F673xA product line is engineered specifically for high-accuracy, ultra-low-power energy measurement systems - integrating metrology-grade ADCs, RTC, LCD, and communication peripherals into a single chip for revenue-grade metering.

FAQ

What is the maximum system clock frequency supported by the MSP430F6733AIPN?

The MSP430F6733AIPN supports a maximum system clock frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This allows real-time execution of metrology algorithms, LCD refresh, and communication tasks without external clock sources. The device achieves 3 µs wake-up from standby mode, ensuring responsive operation in interrupt-driven metering applications. All timing specifications for the MSP430F6733AIPN are validated across its full 1.8 V to 3.6 V supply range and industrial temperature grade.

How many analog input channels does the MSP430F6733AIPN support for metrology measurements?

The MSP430F6733AIPN supports six external analog input channels for the 10-bit ADC and three fully differential input pairs (six pins) for its 24-bit sigma-delta ADCs. Specifically, pins SD0P0/SD0N0, SD1P0/SD1N0, and SD2P0/SD2N0 serve as dedicated inputs for the three SD24_B converters, while P1.0–P1.5 and other designated pins provide additional analog inputs for voltage references, temperature sensing, and auxiliary measurements. This configuration enables simultaneous voltage, current, and neutral current acquisition in single-phase metering topologies.

Does the MSP430F6733AIPN include hardware support for LCD display driving?

Yes, the MSP430F6733AIPN integrates a programmable LCD_C peripheral capable of driving up to 320 segments in 8-mux mode. It includes built-in contrast control, charge pump circuitry (requiring external LCDCAP capacitor), and direct mapping to COM0–COM7 and SEGx pins. The LCD driver operates independently of the CPU, reducing firmware overhead, and maintains display integrity during low-power modes. This eliminates the need for external display controllers in cost-sensitive metering designs where alphanumeric or segmented displays are used.

What low-power modes are available on the MSP430F6733AIPN and their typical current consumption?

The MSP430F6733AIPN offers five low-power modes: LPM3 (1.7 µA at 2.2 V) retains RTC, watchdog, and full RAM; LPM4 (1.6 µA at 3.0 V) retains RAM and supply supervisor; LPM3.5 (1.24 µA at 3.0 V) shuts down core but keeps RTC running with crystal; and LPM4.5 (0.78 µA at 3.0 V) provides deepest shutdown with RAM retention. These values are measured under typical conditions with all clocks disabled except those required for the specified functionality. The MSP430F6733AIPN's flexible power management system enables multi-year battery life in backup-powered metering applications.

Is the MSP430F6733AIPN pin-compatible with other devices in the MSP430F673x family?

Yes, the MSP430F6733AIPN is pin-compatible with all other 80-pin LQFP variants in the MSP430F673x family, including MSP430F6730AIPN through MSP430F6736AIPN. They share identical pin numbering, electrical characteristics, and peripheral mappings in the PN package. Differences are limited to Flash/RAM size and SD24_B channel count - all implemented without altering pin function definitions or package footprint. This allows hardware reuse across metering SKUs with varying feature sets while maintaining PCB layout compatibility.