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Texas Instruments MSP430F2121TDWR
- Part No.:
- MSP430F2121TDWR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F2121TDWR.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
MSP430F2121TDWR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 4KB flash, 256B RAM, a 16-bit Timer_A with three capture/compare registers, and an on-chip analog comparator for slope A/D conversion. It operates from 1.8 V to 3.6 V and supports active-mode current of 250 μA at 1 MHz/2.2 V - optimized for battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430F2121TDWR datasheet, MSP430F2121TDWR pinout, MSP430F2121TDWR application, or MSP430F2121TDWR equivalent, key selection criteria include its -40°C to 105°C extended temperature rating, 20-pin TSSOP (PW) package, integrated DCO with four factory-calibrated frequencies (1/8/12/16 MHz), and JTAG + BSL programming support without external voltage.
Technical Context
The MSP430F2121TDWR implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal input (XIN/XOUT), and high-frequency crystal support up to 16 MHz - all configurable via BCSCTL registers.
It features two 8-bit I/O ports (P1/P2) with individually programmable pullup/pulldown resistors, edge-selectable interrupts, and peripheral mapping including Timer_A inputs (TACLK, INCLK, CCI0A–CCI2B), comparator inputs (CA0–CA7), and JTAG/BSL pins (TCK/TMS/TDI/TDO) multiplexed on P1.4–P1.7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 general-purpose registers and 62.5-ns instruction cycle time |
| Memory | 4KB + 256B flash (main + info memory), 256B RAM - supports in-system programming via JTAG or UART BSL |
| Operating Voltage | 1.8 V to 3.6 V - enables direct operation from single Li-ion or dual alkaline cells |
| Ultra-Low Power | 0.1 μA in LPM4 (RAM retention), <1 μs wake-up from standby - extends battery life in intermittent-sensing applications |
| Clock System | Digital-controlled oscillator (DCO) with four factory-trimmed frequencies (±1%), plus 32-kHz crystal and HF crystal support |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
| Package | 20-pin TSSOP (PW), 0.65 mm pitch - compatible with standard surface-mount assembly and reflow profiles |
Pinout & Package
Package: 20-pin Plastic Small-Outline Thin (TSSOP), suffix PW - RoHS-compliant, JEDEC MO-153 compliant, body size 6.5 mm × 4.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TACLK | Timer_A clock input / GPIO | Accepts external timing source for Timer_A; default function enables asynchronous event capture |
| P1.1/TA0/TDI/TCLK | Timer_A compare output / JTAG test data input | Shared pin for PWM generation and boundary-scan programming - requires mode selection via P1SEL |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Provides SMCLK for peripherals or synchronizes JTAG communication; critical for debug interface stability |
| P2.0/ACLK/CA2 | ACLK output / comparator input | Drives low-frequency peripherals (e.g., RTC) or feeds CA2 for analog threshold detection |
| XIN/P2.6/CA6 | Crystal oscillator input / comparator input | Connects to 32-kHz watch crystal; also serves as analog reference point for comparator_A+ |
| RST/NMI | Reset / non-maskable interrupt | Active-low reset with built-in brownout detector - ensures reliable power-on initialization |
| TEST | JTAG test mode select | Enables JTAG debugging when pulled high during power-up; connects to device protection fuse |
Key Features
| Feature | Design Value |
|---|---|
| On-chip analog comparator | Supports slope A/D conversion without external ADC - reduces BOM count in sensor front-ends |
| Bootstrap loader (BSL) | UART-based flash programming with password protection - enables field firmware updates without JTAG hardware |
| Five low-power modes | LPM0–LPM4 with selective clock gating - allows dynamic power scaling based on real-time processing load |
| Integrated emulation module | Hardware debug support via MSP-FET430UIF - eliminates need for external ICE and accelerates firmware validation |
| Digital I/O flexibility | 16 GPIO pins with individually configurable direction, pullup/pulldown, and interrupt edge select - simplifies PCB routing and signal conditioning |
Applications
| Wireless Sensor Node | Industrial Temperature Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature/humidity and transmitting data via sub-GHz RF transceiver. IC Role / Device Role / Timing Role: Main controller executing sensor readout, slope A/D conversion via comparator_A+, and low-duty-cycle RF transmission scheduling. Use Value: 0.1 μA LPM4 current extends 2xAA battery life beyond 5 years; 1 μs wake-up enables precise timing of RF bursts. |
Use Scenario: DIN-rail mounted enclosure monitoring motor winding temperature in factory automation. IC Role / Device Role / Timing Role: Standalone measurement unit interfacing PT100/RTD via comparator slope ADC and driving isolated RS-485 output. Use Value: -40°C to 105°C rating ensures reliability in uncontrolled cabinet environments; brownout detector prevents corrupted EEPROM writes during line dips. |
| Portable Medical Glucometer | Smart Utility Meter Interface |
Use Scenario: Handheld blood glucose meter requiring low-power display refresh, button debouncing, and strip electrochemical signal processing. IC Role / Device Role / Timing Role: Signal acquisition controller using comparator_A+ for analog front-end amplification and slope integration, then storing calibrated results in flash. Use Value: Integrated 4KB flash stores calibration tables and firmware; 1.8 V minimum supply enables use with coin-cell batteries. |
Use Scenario: AMI (Advanced Metering Infrastructure) endpoint performing pulse counting, tamper detection, and secure data logging. IC Role / Device Role / Timing Role: Secure host processor managing metrology IC interface, AES encryption co-processor trigger, and real-time clock synchronization. Use Value: JTAG + BSL dual-programming path supports both factory provisioning and field security key updates; 256B RAM buffers encrypted packet payloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F2131TDWR | 8KB flash, 256B RAM - double program memory capacity | Suitable for applications requiring larger firmware (e.g., BLE stack, multi-sensor fusion) | Select when future firmware expansion or bootloader complexity demands >4KB code space |
| MSP430G2553IPW20 | 16MHz max MCLK, 16KB flash, 512B RAM, enhanced USCI UART/SPI/I²C - no comparator_A+ | Better suited for communication-centric designs needing serial protocols over analog sensing | Choose when UART/I²C peripheral count outweighs need for on-chip slope ADC functionality |
Compared with MSP430F2121TDWR, MSP430F2131TDWR offers higher flash density for complex algorithms but identical power profile and peripheral set, while MSP430G2553IPW20 trades analog comparator capability for richer digital connectivity - making it less suitable for standalone sensor front-ends but more flexible in host-processor roles.
Availability
MSP430F2121TDWR is available at Aetrix Electronics and suitable for industrial temperature monitors, wireless sensor nodes, portable medical devices, and smart utility meter interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MSP430F2121TDWR 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 specializing in analog, embedded processing, and connectivity technologies - with over 50 years of innovation in low-power design and industrial-grade reliability.
The MSP430F2121TDWR belongs to the MSP430x2xx ultra-low-power MCU family, engineered specifically for battery-operated measurement systems where nanowatt-level sleep current and sub-microsecond wake-up are mandatory design requirements.
FAQ
What is the maximum operating frequency of the MSP430F2121TDWR?
The MSP430F2121TDWR supports a maximum system clock (MCLK) frequency of 16 MHz when supplied at ≥3.3 V. At 2.7 V, the maximum is 12 MHz, and at 1.8 V, it is limited to 6 MHz - all values are specified in the Recommended Operating Conditions table and validated across the -40°C to 105°C range. The DCO is factory-calibrated at 1/8/12/16 MHz for ±1% accuracy without external components.
Does the MSP430F2121TDWR support in-system programming without external hardware?
Yes, the MSP430F2121TDWR includes a UART-based bootstrap loader (BSL) that enables flash programming via P1.1 (TXD) and P2.2 (RXD) using only a serial interface - no JTAG emulator required. The BSL is protected by a user-configurable password and can be disabled permanently using the BSLKEY at address 0xFFDE, ensuring secure field updates for the MSP430F2121TDWR.
What analog functions does the MSP430F2121TDWR provide?
The MSP430F2121TDWR integrates a single comparator_A+ module with eight selectable inputs (CA0–CA7), programmable hysteresis, and output routing to Timer_A. It supports slope analog-to-digital conversion by charging a capacitor through a known current and measuring time-to-threshold - eliminating need for external ADC in low-resolution sensor applications. No DAC or dedicated ADC is included in the MSP430F2121TDWR.
Which development tools are recommended for the MSP430F2121TDWR?
Texas Instruments recommends the MSP-FET430UIF USB-based JTAG programmer/debugger and the MSP-TS430PW28 target socket board for the 20-pin TSSOP package. For production programming, the MSP-GANG430 gang programmer supports parallel flashing of up to eight MSP430F2121TDWR units. All tools fully support the embedded emulation module (EEM) built into the MSP430F2121TDWR.
Is the MSP430F2121TDWR pin-compatible with other members of the MSP430F21x1 family?
Yes, the MSP430F2121TDWR shares identical pinout and electrical characteristics with MSP430F2101TDWR, MSP430F2111TDWR, and MSP430F2131TDWR in the same 20-pin TSSOP (PW) package - enabling drop-in replacement within the same footprint. Firmware compatibility is maintained across the family, though memory size differences require linker script adjustments when migrating between variants like the MSP430F2121TDWR and MSP430F2131TDWR.
MSP430F2121TDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- MSP430F2xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- -
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 16
- Program Memory Size:
- 4KB (4K x 8 + 256B)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- Slope A/D
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F2121TDWR FAQ
1.How can I place an order for MSP430F2121TDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F2121TDWR 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 MSP430F2121TDWR reliable?
The price and inventory of MSP430F2121TDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F2121TDWR is usually 5 days.
3.What payment methods are accepted for MSP430F2121TDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F2121TDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F2121TDWR?
MSP430F2121TDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F2121TDWR 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 MSP430F2121TDWR?
For technical support, including MSP430F2121TDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F2121TDWR requirements.
6.How does Aetrix verify that MSP430F2121TDWR is sourced from the original manufacturer or authorized distributors?
All MSP430F2121TDWR 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 MSP430F2121TDWR meets industry standards.
7.What is the process for return or replacement of MSP430F2121TDWR?
All MSP430F2121TDWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F2121TDWR, 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 MSP430F2121TDWR part is unused and in its original packaging.
Return procedure for MSP430F2121TDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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