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Texas Instruments MSP430FR5731IDAR
- Part No.:
- MSP430FR5731IDAR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 38-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
MSP430FR5731IDAR.pdf
- Description:
- IC MCU 16BIT 4KB FRAM 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,151
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Product details
Overview
MSP430FR5731IDAR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 4KB FRAM nonvolatile memory, 1KB RAM, 24-MHz CPU, 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 fast FRAM writes and RTC-based data logging.
For engineers reviewing the MSP430FR5731IDAR datasheet, MSP430FR5731IDAR pinout, MSP430FR5731IDAR application, or MSP430FR5731IDAR equivalent, key selection criteria include FRAM endurance (10¹⁵ cycles), LPM3.5 RTC current (1.5 µA), 32-pin TSSOP package compatibility, and integrated hardware multiplier for sensor signal processing.
Technical Context
The MSP430FR5731IDAR implements a 16-bit RISC CPUXV2 core with seven low-power modes, including LPM4.5 (0.32 µA shutdown). Its FRAM architecture enables byte-level writes without erase, ECC protection, and MPU-enforced memory segmentation-critical for firmware integrity in unattended deployments.
Analog subsystem includes a 16-channel comparator with programmable hysteresis and internal reference, plus a 10-bit ADC sampling at 200 ksps with 100-µA active power. Digital peripherals comprise three 16-bit timers (TA0/TA1/TB0), 32-bit hardware multiplier, CRC engine, and dual eUSCI modules with independent clock domains for simultaneous UART and I²C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| FRAM Size | 4 KB - Nonvolatile program/data storage with 10¹⁵ write cycles; eliminates flash wear-out in frequent logging applications. |
| CPU Speed | 24 MHz - Full-speed operation across full voltage range (2–3.6 V); supports real-time sensor fusion without clock scaling. |
| ADC Resolution | 10-bit - 12 external + 2 internal channels; 200 ksps throughput at 100 µA enables high-rate analog monitoring. |
| LPM3.5 Current | 1.5 µA - RTC active with 32-kHz crystal; enables decade-scale battery life in time-stamped sensor wake-up systems. |
| eUSCI Peripherals | 2 modules - eUSCI_A0/A1 support UART/IrDA/SPI; eUSCI_B0 supports I²C/SPI; enables concurrent wired and wireless interface management. |
| Supply Range | 2 V to 3.6 V - Direct compatibility with single-cell Li-ion, Li-SOCl₂, and 2xAA alkaline batteries without external regulators. |
| Operating Temp | –40°C to 85°C - Qualified for industrial and outdoor environmental monitoring deployments. |
Pinout & Package
The MSP430FR5731IDAR is housed in a 32-pin TSSOP (DA) package measuring 12.5 mm × 6.2 mm with exposed thermal pad recommended for VSS connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST/NMI/SBWTDIO | Reset / NMI Input / Spy-Bi-Wire Data I/O | Single-wire debug interface; enables in-system programming and real-time debugging without dedicated JTAG pins. |
| TEST/SBWTCK | Spy-Bi-Wire Test Clock | Provides clock for SBW interface; allows full device control using only two pins (TEST + RST/NMI). |
| P1.0/TA0.1/DMAE0/RTCCLK/A0*/CD0/VeREF- | Multi-function GPIO | Supports timer capture, DMA trigger, RTC calibration output, ADC input A0, comparator input CD0, and negative reference voltage. |
| P1.1/TA0.2/TA1CLK/CDOUT/A1*/CD1/VeREF+ | Multi-function GPIO | Enables timer compare, TA1 clock source, comparator output, ADC input A1, comparator input CD1, and positive reference voltage. |
| eUSCI_A0 TX/RX (P2.0/P2.1) | UART Interface Pins | Dedicated full-duplex UART with automatic baud-rate detection; simplifies host communication in noisy industrial environments. |
| eUSCI_B0 SCL/SDA (P1.6/P1.7) | I²C Interface Pins | Standard-mode I²C master/slave interface; supports direct connection to temperature, humidity, and pressure sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Ferroelectric RAM (FRAM) | 4 KB nonvolatile memory with 125 ns word write time, ECC protection, and 10¹⁵ endurance-enables reliable data logging without wear leveling. |
| Ultra-Low-Power RTC | Real-time clock active in LPM3.5 at 1.5 µA with 32-kHz crystal; provides precise timestamping for sensor events during extended sleep periods. |
| Hardware Multiplier | 32-bit MPY unit executes multiply-accumulate operations in one cycle; accelerates digital filtering and sensor calibration math. |
| Integrated Power Management | On-chip LDO, supply voltage supervisor, and zero-power brownout detection eliminate need for external reset ICs and reduce BOM count. |
| Flexible Clock System | DCO with six factory-trimmed frequencies, VLO, LFXT (32 kHz), and HFXT support robust clock sourcing across temperature and voltage ranges. |
Applications
| Smart Meter Sensor Node | Industrial Wireless Sensor |
|---|---|
Use Scenario: Battery-powered electricity meter collecting voltage/current samples every 10 seconds and storing timestamps in FRAM. IC Role / Device Role / Timing Role: Main controller executing ADC sampling, RTC-based timestamping, FRAM logging, and UART transmission to concentrator. Use Value: 4 KB FRAM retains 10+ days of 10-second logs at 1.5 µA RTC current; eliminates flash erase delays and extends battery life beyond 10 years. | Use Scenario: Remote vibration sensor on rotating machinery transmitting FFT coefficients via I²C to LoRa module. IC Role / Device Role / Timing Role: Signal processor running FIR filter on ADC data, computing spectral features, and managing I²C handoff to radio. Use Value: Hardware multiplier completes 64-point FFT in <2 ms; 24-MHz CPU ensures real-time analysis without interrupt latency jitter. |
| Home Automation Hub | Environmental Monitoring Beacon |
Use Scenario: Zigbee coordinator aggregating temperature/humidity readings from 15 end devices and logging local history. IC Role / Device Role / Timing Role: Central MCU handling Zigbee stack, multi-sensor polling, FRAM-based event buffering, and USB-to-UART bridge. Use Value: Dual eUSCI modules enable concurrent Zigbee UART and sensor I²C traffic; 4 KB FRAM buffers 24 hours of aggregated data during network outages. | Use Scenario: Solar-powered air quality monitor logging PM2.5, CO₂, and VOC levels every minute with GPS timestamp. IC Role / Device Role / Timing Role: Low-power manager waking ADC/timer/RTC on alarm, writing to FRAM, and triggering RF transmission only on threshold breach. Use Value: LPM4.5 shutdown draws 0.32 µA; combined with solar harvesting, enables maintenance-free operation for >5 years in field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430FR5732IDAR | Same 32-pin DA package, 4 KB FRAM, but only 6 external ADC channels and 10 comparator inputs (vs. 12/16). | Reduced analog channel count limits multi-sensor front-end integration; suitable for simpler voltage/current monitoring only. | Select when ADC channel count and comparator inputs are not required at full MSP430FR5731IDAR capability. |
| MSP430FR5735IDAR | Same 32-pin DA package, 8 KB FRAM, 12 external ADC channels, 16 comparator inputs-but higher cost and larger memory footprint. | Extra FRAM supports longer local data retention or firmware-over-the-air updates; justified where future feature expansion is planned. | Select when 4 KB FRAM is insufficient for required log depth or when design anticipates firmware growth. |
Compared with MSP430FR5732IDAR, the MSP430FR5731IDAR delivers full 12-channel ADC and 16-input comparator for richer analog sensing; versus MSP430FR5735IDAR, it offers optimal cost/performance balance for fixed-feature sensor nodes without memory headroom requirements.
Availability
MSP430FR5731IDAR is available at Aetrix Electronics and suitable for smart meter sensor nodes, industrial wireless sensors, home automation hubs, and environmental monitoring beacons requiring stable component supply and long-term industrial lifecycle support.
Supply support for MSP430FR5731IDAR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.
The MSP430FR57xx family was designed specifically for ultra-low-power sensing and system management in building automation, smart grid, and industrial applications-leveraging FRAM to eliminate flash limitations in battery-operated edge devices.
FAQ
What is the maximum operating frequency of the MSP430FR5731IDAR?
The MSP430FR5731IDAR operates at up to 24 MHz across its full 2 V to 3.6 V supply range and –40°C to 85°C temperature specification. This frequency is supported by the factory-trimmed DCO oscillator and remains stable without external crystal dependency for core timing, though HFXT may be used for higher precision clock sources in specific applications. The MSP430FR5731IDAR maintains full peripheral functionality-including ADC sampling and eUSCI communication-at this maximum speed.
Does the MSP430FR5731IDAR support hardware debugging?
Yes, the MSP430FR5731IDAR supports hardware debugging via the two-pin Spy-Bi-Wire (SBW) interface using TEST/SBWTCK and RST/NMI/SBWTDIO pins. This interface enables full read/write memory access, breakpoint setting, and real-time register inspection without requiring a full 4-pin JTAG connector. The MSP430FR5731IDAR integrates on-chip debug logic compliant with TI's MSP-FET toolchain and Code Composer Studio IDE.
How much FRAM and RAM does the MSP430FR5731IDAR include?
The MSP430FR5731IDAR integrates 4 KB of ferroelectric RAM (FRAM) for nonvolatile program and data storage, and 1 KB of volatile RAM for runtime variables and stack operations. The FRAM supports byte-level writes without erase cycles, has 10¹⁵ write endurance, and includes built-in error correction coding (ECC). The RAM is powered separately and retains contents only during active or low-power modes-not in shutdown (LPM4.5).
What ADC capabilities does the MSP430FR5731IDAR provide?
The MSP430FR5731IDAR features a 10-bit successive-approximation ADC (ADC10_B) with 12 external analog input channels and 2 internal references (temperature sensor and VMID). It achieves 200 ksps sampling rate at 100 µA active current, supports programmable sample-and-hold, internal voltage reference (1.5 V/2.0 V/2.5 V), and configurable conversion triggers from timers or software. The MSP430FR5731IDAR ADC is fully integrated with DMA for zero-CPU-overhead data acquisition.
Which communication interfaces are available on the MSP430FR5731IDAR?
The MSP430FR5731IDAR includes two enhanced universal serial communication interfaces: eUSCI_A0 and eUSCI_A1 each support UART, IrDA, and SPI; eUSCI_B0 supports I²C and SPI. These modules operate independently with separate clock sources, enabling concurrent UART logging and I²C sensor polling. The MSP430FR5731IDAR also supports hardware UART bootloader (BSL) accessible via UART pins without external programming hardware.
MSP430FR5731IDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 38-TSSOP (0.240", 6.10mm Width)
- Series:
- MSP430™ FRAM
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPUXV2
- Core Size:
- 16-Bit
- Speed:
- 24MHz
- Connectivity:
- I2C, IrDA, LINbus, SCI, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FRAM
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 14x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430FR5731IDAR FAQ
1.How can I place an order for MSP430FR5731IDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430FR5731IDAR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MSP430FR5731IDAR reliable?
The price and inventory of MSP430FR5731IDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430FR5731IDAR is usually 5 days.
3.What payment methods are accepted for MSP430FR5731IDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430FR5731IDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430FR5731IDAR?
MSP430FR5731IDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430FR5731IDAR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MSP430FR5731IDAR?
For technical support, including MSP430FR5731IDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430FR5731IDAR requirements.
6.How does Aetrix verify that MSP430FR5731IDAR is sourced from the original manufacturer or authorized distributors?
All MSP430FR5731IDAR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MSP430FR5731IDAR meets industry standards.
7.What is the process for return or replacement of MSP430FR5731IDAR?
All MSP430FR5731IDAR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430FR5731IDAR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MSP430FR5731IDAR part is unused and in its original packaging.
Return procedure for MSP430FR5731IDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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