Texas Instruments MSP430FR6977IPZ

Overview

MSP430FR6977IPZ from Texas Instruments is a 16-bit ultra-low-power FRAM microcontroller with 64KB nonvolatile memory, 2KB RAM, integrated LCD driver (up to 320 segments), 12-bit ADC (16 external channels), and dual eUSCI modules supporting UART/IrDA/SPI/I²C. It operates from 1.8 V to 3.6 V and targets battery-powered metering applications requiring long-term data retention and real-time clock functionality.

For engineers reviewing the MSP430FR6977IPZ datasheet, MSP430FR6977IPZ pinout, MSP430FR6977IPZ application, or MSP430FR6977IPZ equivalent, key selection criteria include FRAM endurance (10¹⁵ write cycles), LPM3.5 RTC current (0.35 µA), 100-pin LQFP package compatibility, and AES256 security coprocessor support for secure firmware updates.

Technical Context

The MSP430FR6977IPZ implements the CPUXV2 16-bit RISC core with 16 general-purpose registers and executes instructions at up to 16 MHz. Its power architecture supports seven low-power modes, including LPM3.5 (RTC active) and LPM4.5 (shutdown), enabling sub-microamp operation in sleep states while retaining full FRAM and register context.

Peripherals include two independent eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (I²C/SPI), a 32-bit hardware multiplier, three-channel DMA, RTC with calendar/alarm, five 16-bit timers (TA0–TA3, TB0), and an integrated 320-segment LCD controller with contrast control - all accessible via multiplexed I/O on 83 GPIO pins.

Key Specifications

Pinout & Package

The MSP430FR6977IPZ is housed in a 100-pin LQFP (PZ) package measuring 14 mm × 14 mm with exposed thermal pad (not electrically connected). Pin functions are fully multiplexed across digital I/O, analog inputs, timer capture/compare, USCI interfaces, LCD segment/common outputs, and clock domains (ACLK, MCLK, SMCLK).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power FRAM microcontroller applications.

Compared with MSP430FR6979IPZ, the MSP430FR6977IPZ offers identical peripherals and packaging but with half the FRAM capacity-ideal for cost-sensitive metering where firmware size and data depth fit within 64KB. Versus MSP430FR6927IRGC, it delivers full LCD support and HFXT capability at the expense of larger board area.

Availability

MSP430FR6977IPZ is available at Aetrix Electronics and suitable for water metering, heat cost allocation, and portable medical logging requiring stable component supply across multi-year production cycles.

Supply support for MSP430FR6977IPZ 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, embedded processing, and connectivity solutions with emphasis on energy efficiency and reliability.

The MSP430FR69xx product line is engineered for ultra-low-power metering and sensing applications, integrating FRAM, LCD drivers, RTC, and security features to eliminate external memory and reduce system-level power consumption.

FAQ

What is the maximum operating frequency of the MSP430FR6977IPZ?

The MSP430FR6977IPZ supports a maximum system clock frequency of 16 MHz using the factory-trimmed DCO or external HFXT oscillator. This allows real-time execution of metrology algorithms and high-speed FRAM writes while maintaining ultra-low active-mode current of approximately 100 µA/MHz.

Does the MSP430FR6977IPZ support hardware AES encryption?

Yes, the MSP430FR6977IPZ integrates a dedicated AES256 security coprocessor with true random number generation capability. This enables secure firmware updates, encrypted data storage in FRAM, and cryptographic key management without burdening the CPU - a critical feature for certified utility metering and medical devices.

How many LCD segments can the MSP430FR6977IPZ drive?

The MSP430FR6977IPZ integrates the LCD_C peripheral capable of driving up to 320 segments in static, 2-, 3-, 4-, 6-, or 8-mux configurations. This eliminates the need for external LCD controllers in applications such as smart meters and portable diagnostic tools requiring high-resolution alphanumeric displays.

What low-power modes are available on the MSP430FR6977IPZ?

The MSP430FR6977IPZ offers seven optimized low-power modes: LPM0–LPM4, plus LPM3.5 (RTC active at 0.35 µA) and LPM4.5 (full shutdown at 0.02 µA). All modes retain full FRAM and register contents, enabling instant wake-up and deterministic latency for time-critical interrupt handling in battery-operated systems.

Is the MSP430FR6977IPZ pin-compatible with other devices in the FR69xx family?

Yes, the MSP430FR6977IPZ in the 100-pin LQFP (PZ) package shares identical pinout and peripheral mapping with MSP430FR6979IPZ and MSP430FR69791IPZ. This allows direct substitution for memory-scaling purposes without PCB redesign, provided the application does not require the additional 64KB FRAM of the FR6979 variants.