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Texas Instruments MSP430FR5721IDA
- Part No.:
- MSP430FR5721IDA
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 38-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
MSP430FR5721IDA.pdf
- Description:
- IC MCU 16BIT 4KB FRAM 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
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Product details
Overview
MSP430FR5721IDA from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller featuring 4KB FRAM nonvolatile memory, 1KB RAM, and integrated peripherals including a 12-channel 10-bit ADC, 16-channel analog comparator, five 16-bit timers, dual eUSCI modules (UART/IrDA/SPI/I²C), RTC with calendar, and hardware multiplier - designed for battery-powered sensor nodes in industrial monitoring systems.
For engineers reviewing the MSP430FR5721IDA datasheet, MSP430FR5721IDA pinout, MSP430FR5721IDA application, or MSP430FR5721IDA equivalent, key selection criteria include FRAM endurance (10¹⁵ write cycles), LPM3.5 RTC current (1.5 µA), 2–3.6 V supply range, TSSOP-38 package compatibility, and support for secure bootloader (BSL) via UART.
Technical Context
The MSP430FR5721IDA implements the MSP430 CPUXV2 core with 16-bit RISC architecture, operating up to 8 MHz, and integrates FRAM as unified program/data/storage memory with built-in ECC and MPU. Its power management includes an on-chip LDO, SVS with reset, and zero-power brownout detection.
Peripherals are tightly coupled to the three-channel DMA and clocked by a flexible system: DCO (factory-trimmed at six frequencies), VLO, LFXT (32 kHz crystal), and HFXT. The device supports real-time operation via RTC_B with alarm/calendar and low-latency wake-up from LPM3.5 using external interrupts or timer events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| FRAM Size | 4 KB - unified nonvolatile memory for code, data, and logging; enables instant writes without erase delay and eliminates flash wear-out concerns. |
| RAM Size | 1 KB - volatile working memory for stack, variables, and DMA buffers; retained in LPM3 but lost in LPM4.5. |
| ADC Resolution | 10-bit - supports 12 external + 2 internal channels at 200 ksps; enables high-fidelity sensor sampling with internal reference and sample-and-hold. |
| Low-Power Mode LPM3.5 Current | 1.5 µA (typical) - RTC active with 32-kHz crystal; allows years of operation on coin-cell batteries in time-stamped data loggers. |
| Supply Voltage Range | 2.0 V to 3.6 V - compatible with single Li-ion, two alkaline, or regulated 3.3 V rails; eliminates need for external voltage translators. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including HVAC controls and remote metering enclosures. |
| eUSCI Interfaces | 2 × eUSCI_A (UART/IrDA/SPI), 1 × eUSCI_B (I²C/SPI) - provides dual serial paths for sensor fusion (e.g., I²C temp/humidity + UART BLE module). |
Pinout & Package
TSSOP-38 package (12.5 mm × 6.2 mm) with exposed thermal pad recommended for connection to DVSS; pin-compatible across MSP430FR572x DA-package variants (e.g., MSP430FR5725IDA, MSP430FR5729IDA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TA0.1/DMAE0/RTCCLK/A0*/CD0/VeREF- | Multi-function I/O | Primary RTC calibration output; ADC channel A0 input; comparator CD0; DMA trigger source; supports port interrupt and wake-up from LPMx.5. |
| P1.1/TA0.2/TA1CLK/CDOUT/A1*/CD1/VeREF+ | Multi-function I/O | ADC reference input (VeREF+); comparator output; TA0/TA1 clock source; supports analog input A1 and port wake-up. |
| P1.4/TB0.1/UCA0STE/A4*/CD4 | Multi-function I/O | Slave transmit enable for eUSCI_A0 SPI; ADC channel A4 input; comparator CD4; TB0 capture/compare register 1. |
| PJ.4/XIN & PJ.5/XOUT | Clock Input/Output | Connects to 32-kHz crystal for RTC accuracy; requires external load capacitors; enables LPM3.5 operation with 1.5 µA typical current. |
| RST/NMI/SBWTDIO | Reset & Debug | Active-low reset with NMI capability; Spy-Bi-Wire debug I/O; supports in-system programming without external voltage. |
| TEST/SBWTCK | Debug Clock | Enables JTAG/Spy-Bi-Wire test mode; required for programming and boundary-scan; must be pulled high during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ferroelectric RAM (FRAM) | 4 KB unified memory with 125 ns word write speed, 10¹⁵ write endurance, and radiation resistance - eliminates flash erase latency and wear leveling overhead. |
| Ultra-Low-Power RTC | 1.5 µA in LPM3.5 with 32-kHz crystal - enables decade-scale timestamping in environmental sensors without external RTC IC. |
| Hardware CRC & MPU | 16-bit cyclic redundancy checker and memory protection unit - ensures firmware integrity and prevents accidental overwrites in safety-critical logging. |
| Integrated Power Management | On-chip LDO, supply voltage supervisor (SVS), and zero-power brownout detection - simplifies power design and guarantees reliable reset under voltage sag. |
| Dual eUSCI Serial Peripherals | eUSCI_A0/A1 (UART/IrDA/SPI) + eUSCI_B0 (I²C/SPI) - supports concurrent communication with multiple sensors (e.g., I²C accelerometer + UART LoRa module). |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
|
Use Scenario: Battery-powered electricity/water meter collecting pulse counts and temperature every 15 minutes, storing timestamps and values locally. IC Role / Device Role / Timing Role: Main controller executing metering algorithm, managing FRAM-based circular log, and waking every 15 min via RTC alarm to sample and transmit. Use Value: 4 KB FRAM retains >1 month of 15-min logs; LPM3.5 draws only 1.5 µA, enabling 10+ year battery life on CR2032. |
Use Scenario: Remote soil moisture and ambient temperature node transmitting data hourly via sub-GHz RF transceiver. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring ADC readings, applying digital filtering, formatting packets, and synchronizing transmission via RTC-driven timer. Use Value: Dual eUSCI interfaces allow simultaneous I²C sensor readout and UART RF control; 2–3.6 V range matches primary battery discharge curve. |
| Industrial Condition Monitoring | Home Automation Hub |
|
Use Scenario: Vibration and temperature monitor mounted on motor housing, detecting anomalies and triggering alerts via wired RS-485. IC Role / Device Role / Timing Role: Real-time signal processor running FFT on ADC samples, comparing against thresholds, and driving RS-485 transceiver via eUSCI_A0 UART. Use Value: Hardware multiplier accelerates FFT computation; 10-bit ADC resolves <1°C temp changes; –40°C to +85°C rating suits harsh enclosures. |
Use Scenario: Central hub aggregating Zigbee/Z-Wave sensor data, running local automation rules, and syncing state to cloud via Wi-Fi module. IC Role / Device Role / Timing Role: Low-power coordinator managing peripheral I/O, buffering sensor events in FRAM, and scheduling Wi-Fi bursts using RTC alarm wake-up. Use Value: FRAM endurance supports frequent state updates; LPM3 current (6.3 µA) extends standby between sensor polling intervals. |
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 |
|---|---|---|---|
| MSP430FR5725IDA | 8 KB FRAM, same 1 KB RAM, identical peripherals and pinout in DA package. | Higher logging capacity for extended event history or firmware OTA storage. | Select when >4 KB nonvolatile storage is required without changing PCB layout. |
| MSP430FR5729IDA | 16 KB FRAM, 32 I/O pins (vs. 30), adds third Timer_B instance and extra capture/compare registers. | Supports more complex timing tasks (e.g., multi-phase motor control) and larger sensor arrays. | Choose for designs needing expanded I/O or enhanced timer resources while retaining DA-package footprint. |
Compared with MSP430FR5725IDA and MSP430FR5729IDA, the MSP430FR5721IDA delivers optimal cost/performance balance for compact sensor nodes where 4 KB FRAM suffices and full I/O expansion is unnecessary - preserving BOM simplicity and board space.
Availability
MSP430FR5721IDA is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial condition monitoring, and home automation hubs requiring stable component supply and long-term manufacturability.
Supply support for MSP430FR5721IDA 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 specializing in analog and embedded processing technologies, with leadership in low-power microcontrollers and precision analog solutions.
The MSP430FR572x product line was engineered for ultra-low-power sensing and system management in building automation, smart grid infrastructure, and industrial IoT edge devices - leveraging FRAM to eliminate flash limitations in data-logging applications.
FAQ
What is the maximum operating frequency of the MSP430FR5721IDA?
The MSP430FR5721IDA operates at up to 8 MHz using its factory-trimmed DCO oscillator. This frequency is fully supported across the entire specified voltage range (2.0 V to 3.6 V) and temperature range (–40°C to +85°C), enabling deterministic real-time execution for time-critical sensor sampling and control loops without external crystal dependency.
Does the MSP430FR5721IDA support hardware encryption or secure boot?
The MSP430FR5721IDA does not include dedicated hardware encryption engines or secure boot ROM. It supports secure firmware updates via the hardware UART bootloader (BSL), which can be password-protected and locked after programming. For cryptographic operations, software libraries (e.g., AES-128) run on the CPUXV2 core with FRAM used for key storage - though key protection relies on MPU configuration rather than tamper-resistant hardware.
Can the MSP430FR5721IDA drive an external 32-kHz crystal for RTC accuracy?
Yes, the MSP430FR5721IDA supports external 32-kHz crystals via PJ.4/XIN and PJ.5/XOUT pins. When configured for LFXT mode, it achieves RTC accuracy within ±20 ppm over temperature and voltage, enabling LPM3.5 operation with 1.5 µA typical current - critical for long-duration timestamping in battery-powered applications.
How many ADC channels are available on the MSP430FR5721IDA?
The MSP430FR5721IDA features a 10-bit ADC (ADC10_B) with 12 external input channels (A0–A11) and 2 internal channels (temperature sensor and VREF). All 12 external channels are accessible on the TSSOP-38 (DA) package, matching the pin count and routing capability shown in the device's DA-package pin diagram and signal descriptions.
Is the MSP430FR5721IDA pin-compatible with other MSP430FR572x DA-package devices?
Yes, the MSP430FR5721IDA is pin-compatible with all DA-package MSP430FR572x variants (e.g., MSP430FR5725IDA, MSP430FR5729IDA) as confirmed by TI's Device Comparison table and Pin Diagram – DA Package section. Identical pin numbering, function mapping, and package dimensions (12.5 mm × 6.2 mm) allow drop-in replacement where FRAM size or timer count differences do not impact functionality.
MSP430FR5721IDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 38-TSSOP (0.240", 6.10mm Width)
- Series:
- MSP430™ FRAM
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPUXV2
- Core Size:
- 16-Bit
- Speed:
- 8MHz
- 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:
MSP430FR5721IDA FAQ
1.How can I place an order for MSP430FR5721IDA through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430FR5721IDA 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 MSP430FR5721IDA reliable?
The price and inventory of MSP430FR5721IDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430FR5721IDA is usually 5 days.
3.What payment methods are accepted for MSP430FR5721IDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430FR5721IDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430FR5721IDA?
MSP430FR5721IDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430FR5721IDA 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 MSP430FR5721IDA?
For technical support, including MSP430FR5721IDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430FR5721IDA requirements.
6.How does Aetrix verify that MSP430FR5721IDA is sourced from the original manufacturer or authorized distributors?
All MSP430FR5721IDA 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 MSP430FR5721IDA meets industry standards.
7.What is the process for return or replacement of MSP430FR5721IDA?
All MSP430FR5721IDA units undergo pre-shipment inspection (PSI). If there is an issue with MSP430FR5721IDA, 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 MSP430FR5721IDA part is unused and in its original packaging.
Return procedure for MSP430FR5721IDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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