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Texas Instruments MSP430F2121TPW
- Part No.:
- MSP430F2121TPW
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MSP430F2121TPW.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
MSP430F2121TPW 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 - deployed in battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430F2121TPW datasheet, MSP430F2121TPW pinout, MSP430F2121TPW application, or MSP430F2121TPW equivalent, key selection criteria include its -40°C to +105°C extended temperature rating, TSSOP-20 package, 1.8–3.6 V supply range, sub-1 µs wake-up from standby, and integrated BSL for UART-based firmware updates without external programming voltage.
Technical Context
The MSP430F2121TPW implements a 16-bit RISC CPU with constant generators and seven addressing modes, executing instructions in one CPU clock cycle. Its basic clock module integrates a digitally controlled oscillator (DCO) calibrated to ±1% at 1/8/12/16 MHz, plus support for 32-kHz crystal and high-frequency crystal up to 16 MHz.
It features two 8-bit I/O ports (P1, P2) with individually programmable pullup/pulldown resistors and edge-selectable interrupts, a brownout detector, and an on-chip comparator supporting analog signal compare or slope ADC - all operating within five software-selectable low-power modes including LPM4 (0.1 µA RAM retention).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 registers and 62.5-ns instruction cycle time - enables efficient code execution and deterministic real-time response. |
| Memory | 4KB + 256B flash program memory and 256B RAM - sufficient for standalone sensor firmware with calibration data storage. |
| Supply Voltage | 1.8 V to 3.6 V - compatible with single-cell Li-ion, LiFePO₄, or dual-AA alkaline battery systems without regulation. |
| Active Current | 250 µA at 1 MHz / 2.2 V - enables multi-year operation in duty-cycled sensor applications. |
| Standby Current | 0.7 µA - supports long-duration sleep between measurements while retaining RAM and register state. |
| Wake-up Time | <1 µs from standby mode - critical for responsive event-driven sensing and low-latency interrupt handling. |
| Operating Temp | -40°C to +105°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 20-pin TSSOP (PW), 0.65 mm pitch, body size 6.5 × 4.4 mm, exposed pad recommended to be connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TACLK | Timer_A clock input | Accepts external timing source for precise event synchronization or gated sampling. |
| P1.1/TA0/TMS | Capture/compare output / JTAG test mode select | Dual-function pin enabling both PWM generation and boundary-scan programming control. |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Provides system-peripheral clock signal or synchronizes JTAG debug interface. |
| P2.0/ACLK/CA2 | ACLK output / comparator positive input | Drives low-frequency peripherals or serves as analog reference point for comparator thresholding. |
| XIN/P2.6/CA6 | Crystal oscillator input / comparator input | Supports precision 32-kHz watch crystal or external analog signal injection into comparator. |
| RST/NMI | Reset or non-maskable interrupt | Hardware reset initiation or high-priority fault-handling trigger independent of interrupt enable state. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip bootstrap loader (BSL) | Enables UART-based flash programming without external tools - reduces production test complexity and field firmware updates. |
| Digital-controlled oscillator (DCO) | Four factory-calibrated frequencies (1/8/12/16 MHz) with ±1% accuracy - eliminates need for external crystal in cost-sensitive designs. |
| Analog comparator (Comparator_A+) | Eight-channel input multiplexer with CAOUT output - supports battery voltage monitoring, zero-crossing detection, and slope ADC without external components. |
| Low-power modes (LPM0–LPM4) | LPM4 draws only 0.1 µA with RAM retention - extends battery life in intermittently active sensor nodes. |
| JTAG emulation module | Fully integrated EEM supports real-time debugging, breakpoints, and flash programming via MSP-FET430U28 or MSP-FET430UIF. |
Applications
| Wireless Sensor Node | Battery-Powered Data Logger |
|---|---|
Use Scenario: Autonomous environmental sensor collecting temperature/humidity at 10-second intervals and transmitting via sub-GHz RF link. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition, slope ADC conversion via Comparator_A+, low-power scheduling, and RF interface timing. Use Value: Sub-1 µs wake-up and 0.1 µA LPM4 current enable >5-year operation on CR2032 coin cell. |
Use Scenario: Industrial vibration monitor logging accelerometer data every minute to internal flash for later USB retrieval. IC Role / Device Role / Timing Role: System-on-chip host performing analog front-end conditioning, timestamped storage, and power-gated flash writes. Use Value: Integrated 4KB flash and 256B RAM eliminate external memory, reducing BOM count and PCB area. |
| Portable Medical Monitor | Smart Meter Endpoint |
Use Scenario: Handheld pulse oximeter measuring SpO₂ using photodiode signals and red/IR LED drive control. IC Role / Device Role / Timing Role: Analog signal processor using Comparator_A+ for synchronous demodulation and Timer_A for precise LED timing. Use Value: On-chip comparator and 16-bit timer replace discrete op-amp and logic ICs - lowering system noise and component count. |
Use Scenario: Electricity meter endpoint detecting zero-crossings, computing RMS values, and communicating via PLC or RF mesh. IC Role / Device Role / Timing Role: Real-time energy computation engine with accurate 32-kHz ACLK timing and brownout-safe flash logging. Use Value: Brownout detector and -40°C to +105°C rating ensure reliable operation during grid transients and outdoor thermal cycling. |
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 |
|---|---|---|---|
| MSP430F2131TPW | 8KB flash, 256B RAM, same peripherals and pinout | Required when firmware exceeds 4KB or needs larger parameter/configuration storage | Select MSP430F2131TPW if future firmware growth or field-upgrade capability is needed; otherwise MSP430F2121TPW offers optimal cost/performance balance. |
| MSP430G2553IPW20 | 16KB flash, 512B RAM, enhanced USCI (UART/SPI/I²C), but no built-in comparator | Suitable for communication-centric designs needing serial interfaces over analog sensing | Choose MSP430G2553IPW20 when UART/SPI/I²C connectivity is primary requirement and external comparator can be added; MSP430F2121TPW retains analog integration advantage. |
Compared with MSP430F2131TPW and MSP430G2553IPW20, the MSP430F2121TPW delivers the most cost-effective integration of flash size, analog comparator, and extended temperature range for compact sensor endpoints - avoiding over-provisioned memory or missing analog functionality.
Availability
MSP430F2121TPW is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, and portable medical monitors requiring stable component supply across industrial and automotive temperature ranges.
Supply support for MSP430F2121TPW 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 decades of ultra-low-power MCU innovation.
The MSP430F21x1 product line targets portable measurement and sensor applications where extended battery life, analog integration, and robust operation across wide temperature ranges are essential design requirements.
FAQ
What is the maximum operating frequency of the MSP430F2121TPW?
The MSP430F2121TPW supports a maximum MCLK frequency of 16 MHz when VCC ≥3.3 V and duty cycle is 50% ±10%. At lower supply voltages, the maximum frequency is reduced: 12 MHz at 2.7 V and 6 MHz at 1.8 V. These limits are defined by the DCO's calibrated operating range and must be observed to ensure reliable CPU and peripheral operation in the MSP430F2121TPW.
Does the MSP430F2121TPW include hardware debug support?
Yes, the MSP430F2121TPW integrates an Embedded Emulation Module (EEM) that provides full JTAG-based debugging and programming capability. It is compatible with TI's MSP-FET430U28 (for PW package), MSP-FET430UIF, and MSP-FET430PIF debug interfaces - enabling breakpoints, real-time variable inspection, and flash programming directly through the MSP430F2121TPW's dedicated JTAG pins.
Can the MSP430F2121TPW perform analog-to-digital conversion without an external ADC?
Yes, the MSP430F2121TPW uses its integrated Comparator_A+ module with Timer_A to implement slope-mode analog-to-digital conversion. By charging a capacitor linearly and comparing it against the input voltage, the MSP430F2121TPW achieves effective ADC resolution dependent on timing accuracy and comparator response - eliminating the need for a separate ADC IC in cost- and space-constrained designs.
What is the purpose of the TEST pin on the MSP430F2121TPW?
The TEST pin on the MSP430F2121TPW selects test mode for JTAG functionality on Port 1 pins and connects to the device protection fuse. During programming, it enables JTAG access; after fuse blow, it disables further JTAG access to prevent unauthorized firmware extraction. The TEST pin must be pulled low during normal operation unless actively used for programming or debugging the MSP430F2121TPW.
Is the MSP430F2121TPW pin-compatible with other devices in the MSP430F21x1 family?
Yes, the MSP430F2121TPW shares identical pinout and package (TSSOP-20) with MSP430F2101TPW, MSP430F2111TPW, and MSP430F2131TPW. This allows direct substitution within the same footprint when upgrading flash size or migrating across variants - provided software accommodates differences in memory map and calibration data location in the MSP430F2121TPW.
MSP430F2121TPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Series:
- MSP430F2xx
- Packaging:
- Tube
- 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:
MSP430F2121TPW FAQ
1.How can I place an order for MSP430F2121TPW through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F2121TPW 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 MSP430F2121TPW reliable?
The price and inventory of MSP430F2121TPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F2121TPW is usually 5 days.
3.What payment methods are accepted for MSP430F2121TPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F2121TPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F2121TPW?
MSP430F2121TPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F2121TPW 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 MSP430F2121TPW?
For technical support, including MSP430F2121TPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F2121TPW requirements.
6.How does Aetrix verify that MSP430F2121TPW is sourced from the original manufacturer or authorized distributors?
All MSP430F2121TPW 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 MSP430F2121TPW meets industry standards.
7.What is the process for return or replacement of MSP430F2121TPW?
All MSP430F2121TPW units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F2121TPW, 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 MSP430F2121TPW part is unused and in its original packaging.
Return procedure for MSP430F2121TPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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