Texas Instruments MSP430FR5739IRHAR

Overview

MSP430FR5739IRHAR from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller featuring 16KB ferroelectric RAM (FRAM), 1KB SRAM, 24-MHz system clock, 12-channel 10-bit ADC, and dual eUSCI modules supporting UART/IrDA/SPI/I²C. It operates from 2 V to 3.6 V across –40°C to 85°C and targets battery-powered sensor nodes requiring nonvolatile memory endurance and real-time clock functionality.

For engineers reviewing the MSP430FR5739IRHAR datasheet, MSP430FR5739IRHAR pinout, MSP430FR5739IRHAR application, or MSP430FR5739IRHAR equivalent, key selection criteria include FRAM write endurance (10¹⁵ cycles), LPM3.5 RTC current (1.5 µA), 40-pin VQFN package thermal pad grounding, and compatibility with MSP-TS430RHA40A target board.

Technical Context

The MSP430FR5739IRHAR integrates a CPUXV2 core with hardware multiplier and three-channel DMA for deterministic signal processing. Its FRAM architecture enables simultaneous read/write without erase cycles, while the dual eUSCI_A (UART/IrDA/SPI) and eUSCI_B (I²C/SPI) support concurrent serial communication with independent clock domains.

Power management includes integrated LDO, SVS with reset, zero-power brownout detection, and seven low-power modes-LPM3.5 (RTC + crystal) draws only 1.5 µA, and LPM4.5 (shutdown) consumes 0.32 µA. The 16-channel analog comparator features programmable hysteresis and internal voltage reference for sensor thresholding.

Key Specifications

Pinout & Package

Package: 40-pin VQFN (RHA), 6 mm × 6 mm body with exposed thermal pad (to be connected to DVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR5738IRHAR, the MSP430FR5739IRHAR provides 6 additional ADC channels and full P3.x port for expanded analog sensing and GPIO flexibility; versus MSP430FR5969IPM, it offers smaller size and lower power at the expense of security acceleration and memory capacity.

Availability

MSP430FR5739IRHAR is available at Aetrix Electronics and suitable for smart metering, industrial wireless sensing, and environmental data logging requiring stable component supply and long-term manufacturability.

Supply support for MSP430FR5739IRHAR 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 personal electronics markets.

The MSP430FR573x product line was designed for ultra-low-power sensing and system management in building automation, smart grid, and industrial applications-leveraging FRAM for high-endurance, low-energy nonvolatile storage.

FAQ

What is the maximum system clock frequency supported by the MSP430FR5739IRHAR?

The MSP430FR5739IRHAR supports a maximum system clock frequency of 24 MHz, achieved via the factory-trimmed DCO oscillator or external HFXT crystal. This allows real-time processing of sensor data at high throughput while maintaining compatibility with TI's MSP430 low-power architecture. The 24-MHz capability is confirmed in the device overview section of the SLAS639L datasheet and applies specifically to the MSP430FR5739IRHAR variant in RHA package.

Does the MSP430FR5739IRHAR include hardware support for cryptographic operations?

No, the MSP430FR5739IRHAR does not include dedicated cryptographic hardware such as AES or SHA accelerators. Its security features are limited to the Memory Protection Unit (MPU) for code/data isolation and basic watchdog timer functionality. For applications requiring hardware encryption, engineers should consider the MSP430FR59xx family (e.g., MSP430FR5969IPM), which integrates AES-128 acceleration. The MSP430FR5739IRHAR relies on software-based security primitives.

How many I²C interfaces does the MSP430FR5739IRHAR provide, and what are their capabilities?

The MSP430FR5739IRHAR provides one dedicated I²C interface via eUSCI_B0, supporting standard-mode (100 kbps) and fast-mode (400 kbps) operation with multiple-slave addressing. It does not support I²C multi-master arbitration or SMBus-specific features. This interface is validated for use with common sensors (e.g., temperature, humidity) and is documented in Section 5.28 of the SLAS639L datasheet. No second I²C channel is available on the MSP430FR5739IRHAR.

What is the purpose of the VCORE pin on the MSP430FR5739IRHAR, and how should it be decoupled?

VCORE is the output pin of the integrated low-dropout regulator (LDO) that supplies regulated voltage to the CPU and digital logic. It must be decoupled with a 1-µF ceramic capacitor placed as close as possible to the VCORE and DVSS pins, per Section 8.2 of the SLAS639L datasheet. Improper decoupling may cause core voltage instability during high-speed operation or wake-up transients, leading to unpredictable behavior. This requirement applies specifically to the MSP430FR5739IRHAR in VQFN package.

Can the MSP430FR5739IRHAR operate from a 1.8-V supply?

No, the MSP430FR5739IRHAR has a minimum recommended operating voltage of 2.0 V, as specified in Section 5.3 of the SLAS639L datasheet. Operation below 2.0 V may result in undefined behavior, including FRAM write failures, ADC inaccuracies, or failure to exit low-power modes. While absolute maximum ratings list 1.8 V as a stress limit, functional operation is guaranteed only within 2.0 V to 3.6 V-this range is strictly enforced for the MSP430FR5739IRHAR.