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Texas Instruments MSP430FR5721IDAR
- Part No.:
- MSP430FR5721IDAR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 38-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
MSP430FR5721IDAR.pdf
- Description:
- IC MCU 16BIT 4KB FRAM 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
MSP430FR5721IDAR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 4KB of ferroelectric RAM (FRAM), 1KB of SRAM, and a 8-MHz CPU. It integrates 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. It targets battery-powered sensor nodes in industrial monitoring and smart metering.
For engineers reviewing the MSP430FR5721IDAR datasheet, MSP430FR5721IDAR pinout, MSP430FR5721IDAR application, or MSP430FR5721IDAR equivalent, key selection criteria include FRAM endurance (10¹⁵ write cycles), sub-µA real-time clock operation (1.5 µA LPM3.5), integrated memory protection unit (MPU), and support for SPI/I²C/UART bootloading without external voltage.
Technical Context
The MSP430FR5721IDAR implements the MSP430xV2 CPU core with unified FRAM addressing for code, data, and storage - eliminating separate flash/EEPROM partitions. Its power management includes seven low-power modes, always-on brownout detection, and an integrated LDO regulator.
Peripherals are tightly coupled via three-channel DMA and share clock domains (MCLK, SMCLK, ACLK) sourced from DCO, VLO, LFXT, or HFXT. The device supports simultaneous UART bootloading and active peripheral operation, with eUSCI_A0/A1 and eUSCI_B0 enabling concurrent serial protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU (MSP430xV2) with 8-MHz max clock - enables deterministic real-time control at ultra-low power |
| Nonvolatile Memory | 4KB FRAM - supports 10¹⁵ write cycles, 125 ns/word writes, ECC + MPU for robust firmware/data storage |
| ADC | 12-channel 10-bit SAR ADC @ 200 ksps - delivers 100-µA active current with internal reference and sample-and-hold |
| Low-Power Modes | LPM3.5 (RTC + crystal): 1.5 µA typical - sustains calendar timekeeping with wake-up on alarm or I/O event |
| eUSCI Peripherals | eUSCI_A0/A1 (UART/IrDA/SPI), eUSCI_B0 (I²C/SPI) - enables multi-protocol communication with automatic baud-rate detection |
| Supply Range | 2.0 V to 3.6 V - compatible with single-cell Li-ion, Li-SOCl₂, and two-cell alkaline battery systems |
| Operating Temp | –40°C to 85°C - qualified for industrial environments including utility metering and building automation |
Pinout & Package
Package: 38-pin TSSOP (DA), 12.5 mm × 6.2 mm body, exposed thermal pad recommended to be connected to DVSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TA0.1/DMAE0/RTCCLK/A0*/CD0/VeREF- | Multi-function I/O | RTC calibration output, ADC channel A0 input, comparator CD0 input, DMA trigger source - enables time-stamped sensor sampling |
| P1.1/TA0.2/TA1CLK/CDOUT/A1*/CD1/VeREF+ | Multi-function I/O | ADC reference input (VeREF+), comparator output, timer clock source - supports precision ratiometric measurements |
| P1.4/TB0.1/UCA0STE/A4*/CD4 | Multi-function I/O | Slave transmit enable for eUSCI_A0 SPI, ADC channel A4 input, comparator CD4 input - allows daisy-chained sensor interfaces |
| P2.5/TB0.0/UCA1TXD/UCA1SIMO | Multi-function I/O | UART transmit / SPI master-out, Timer_B0 capture/compare - supports full-duplex serial communication with timing-critical responses |
| RST/NMI/SBWTDIO | Reset & debug | Active-low reset, non-maskable interrupt, Spy-Bi-Wire data I/O - enables in-system programming and debugging without JTAG header |
Key Features
| Feature | Design Value |
|---|---|
| FRAM memory architecture | 4KB unified nonvolatile memory with 10¹⁵ write endurance and zero write latency - eliminates erase cycles and extends battery life in logging applications |
| Real-time clock with calendar | Hardware RTC in LPM3.5 draws only 1.5 µA with 32-kHz crystal - maintains accurate timekeeping during extended sleep without external RTC IC |
| Integrated memory protection | MPU enforces read/write/execute permissions across FRAM/SRAM regions - prevents accidental code corruption and enhances firmware security |
| Dual eUSCI modules | eUSCI_A0/A1 support UART auto-baud and IrDA; eUSCI_B0 supports I²C multi-slave addressing - simplifies connectivity to sensors, displays, and host controllers |
| Ultra-low-power analog | 10-bit ADC consumes 100 µA at 200 ksps with internal reference - enables high-resolution sensor acquisition while minimizing system power budget |
Applications
| Smart Utility Metering | Industrial Sensor Node |
|---|---|
Use Scenario: Battery-powered electricity/water/gas meters collecting hourly consumption data with tamper detection and secure firmware updates. IC Role / Device Role / Timing Role: Main controller executing metrology algorithms, managing FRAM-based data logging, and handling secure I²C communication with metrology ASICs. Use Value: 4KB FRAM enables decade-long data retention without wear leveling; 1.5 µA RTC mode extends 10-year battery life; MPU prevents unauthorized firmware modification. | Use Scenario: Wireless temperature/humidity/pressure node in factory floor or HVAC ducts, transmitting readings every 5 minutes via UART-to-LoRaWAN gateway. IC Role / Device Role / Timing Role: Sensor interface hub acquiring analog inputs, performing local threshold checks, and scheduling low-duty-cycle RF transmissions using RTC alarms. Use Value: Integrated 12-channel ADC reduces BOM cost; sub-µA standby (6.3 µA LPM3) maximizes battery runtime; eUSCI_A0 UART supports direct connection to transceiver modules. |
| Home Automation Hub | Asset Tracking Beacon |
Use Scenario: Zigbee/Z-Wave coordinator aggregating data from door/window sensors, motion detectors, and thermostats in residential settings. IC Role / Device Role / Timing Role: Central MCU managing multiple I²C/SPI peripherals, running lightweight protocol stacks, and maintaining real-time event timestamps. Use Value: Dual eUSCI_B0 (I²C) and eUSCI_A1 (SPI) allow concurrent sensor and radio interfacing; FRAM stores configuration and event logs with instant write capability. | Use Scenario: GPS-enabled logistics tag reporting location and shock events every 6 hours using cellular or NB-IoT uplink. IC Role / Device Role / Timing Role: Power-aware controller activating GPS module only on RTC alarm, logging accelerometer-triggered events to FRAM before transmission. Use Value: 0.32 µA shutdown mode (LPM4.5) preserves battery during transit; 10¹⁵ FRAM write cycles ensure reliable crash-event logging over 10+ years. |
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 |
|---|---|---|---|
| MSP430FR5725IDAR | 8KB FRAM, same package and pinout - adds 4KB nonvolatile storage capacity | Preferred where extended data logging or larger firmware images are required | Select when FRAM size is limiting; identical peripheral set and power profile ensure drop-in compatibility |
| MSP430FR5720IRGER | 4KB FRAM, 24-pin VQFN (RGE) package - smaller footprint but fewer I/O (17 vs. 30) | Suitable for space-constrained designs with reduced peripheral count requirements | Choose for compact PCB layouts; verify I/O mapping and ADC channel availability match system needs |
Compared with MSP430FR5725IDAR, the MSP430FR5721IDAR trades FRAM capacity for cost-sensitive deployments; versus MSP430FR5720IRGER, it provides 30 GPIOs and full 12-channel ADC support in a TSSOP package optimized for manual assembly and test.
Availability
MSP430FR5721IDAR is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, home automation hubs, and asset tracking beacons requiring stable component supply and long-term lifecycle support.
Supply support for MSP430FR5721IDAR 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 for industrial, automotive, and consumer markets.
The MSP430FR57xx family was designed specifically for ultra-low-power sensing and system management in battery-operated infrastructure applications - emphasizing FRAM reliability, sub-µA real-time operation, and integrated analog front-ends.
FAQ
What is the maximum operating frequency of the MSP430FR5721IDAR?
The MSP430FR5721IDAR operates at a maximum CPU clock frequency of 8 MHz, supported by its factory-trimmed DCO oscillator with six selectable frequencies. This speed enables real-time signal processing and responsive peripheral handling while maintaining ultra-low active-mode current (81.4 µA/MHz typical). The MSP430FR5721IDAR's clock system also includes VLO, LFXT, and HFXT sources for flexible timing across low-power and high-accuracy use cases.
Does the MSP430FR5721IDAR support hardware UART bootloading?
Yes, the MSP430FR5721IDAR includes a hardware UART bootloader (BSL) that operates without external voltage - enabling field firmware updates via eUSCI_A0 or eUSCI_A1. The BSL supports standard UART frames and is accessible through dedicated pins (e.g., P2.5/P2.6 for eUSCI_A1), with security configurable via BSL password or fuse options. This capability is fully documented in the MSP430FR57xx Family User's Guide and requires no additional programming hardware.
How much FRAM and SRAM does the MSP430FR5721IDAR integrate?
The MSP430FR5721IDAR integrates 4KB of ferroelectric RAM (FRAM) and 1KB of SRAM. The FRAM serves as unified nonvolatile memory for program code, runtime variables, and data logging - offering 10¹⁵ write cycles, 125 ns per word write speed, and built-in ECC. The 1KB SRAM provides fast volatile working memory for stack and heap operations, with MPU-enforced access control to prevent corruption.
What ADC resolution and channel count does the MSP430FR5721IDAR provide?
The MSP430FR5721IDAR features a 10-bit successive approximation register (SAR) ADC with 12 external input channels and 2 internal channels (temperature sensor and VREF). It achieves 200 ksps sampling rate at 100 µA active current, includes programmable sample-and-hold, internal voltage reference, and configurable conversion triggers - making it suitable for precision analog sensing in battery-constrained systems.
Which low-power modes are available on the MSP430FR5721IDAR, and what are their typical currents?
The MSP430FR5721IDAR offers seven low-power modes: LPM3 (standby with VLO) draws 6.3 µA typical; LPM3.5 (RTC with 32-kHz crystal) draws 1.5 µA typical; and LPM4.5 (shutdown) draws 0.32 µA typical. These modes enable aggressive power gating while preserving RAM/FRAM content and supporting wake-up via interrupts, RTC alarms, or I/O events - critical for multi-year battery operation in remote sensing applications.
MSP430FR5721IDAR 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:
- 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:
MSP430FR5721IDAR FAQ
1.How can I place an order for MSP430FR5721IDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430FR5721IDAR 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 MSP430FR5721IDAR reliable?
The price and inventory of MSP430FR5721IDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430FR5721IDAR is usually 5 days.
3.What payment methods are accepted for MSP430FR5721IDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430FR5721IDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430FR5721IDAR?
MSP430FR5721IDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430FR5721IDAR 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 MSP430FR5721IDAR?
For technical support, including MSP430FR5721IDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430FR5721IDAR requirements.
6.How does Aetrix verify that MSP430FR5721IDAR is sourced from the original manufacturer or authorized distributors?
All MSP430FR5721IDAR 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 MSP430FR5721IDAR meets industry standards.
7.What is the process for return or replacement of MSP430FR5721IDAR?
All MSP430FR5721IDAR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430FR5721IDAR, 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 MSP430FR5721IDAR part is unused and in its original packaging.
Return procedure for MSP430FR5721IDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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