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Texas Instruments MSP430F2121IDWR
- Part No.:
- MSP430F2121IDWR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F2121IDWR.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:324
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Product details
Overview
MSP430F2121IDWR 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, an on-chip analog comparator for slope A/D conversion, and operation across 1.8–3.6 V. It targets battery-powered sensor systems requiring sub-1μs wake-up and long-term energy efficiency.
For engineers reviewing the MSP430F2121IDWR datasheet, MSP430F2121IDWR pinout, MSP430F2121IDWR application, or MSP430F2121IDWR equivalent, key selection criteria include its 20-pin TSSOP (PW) package, calibrated DCO frequencies up to 16 MHz, brownout detection, and integrated BSL for UART-based in-system programming without external voltage.
Technical Context
The MSP430F2121IDWR implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock module supports multiple sources: internal DCO (calibrated at 1/8/12/16 MHz), 32-kHz crystal, high-frequency crystal up to 16 MHz, or external digital clock.
Five low-power modes-including LPM4 (0.1 μA with RAM retention)-are software-selectable and interrupt-wakeup capable. The analog comparator feeds into Timer_A for slope ADC functionality, while the 16-bit Timer_A3 provides PWM, interval timing, and capture/compare on up to three channels with dedicated interrupt vectors.
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 deterministic real-time control and compact firmware footprint. |
| Memory | 4KB + 256B flash / 256B RAM - sufficient for standalone sensor firmware with calibration data storage and runtime variables. |
| Supply Voltage | 1.8 V to 3.6 V - compatible with single-cell Li-ion, coin-cell, or regulated 3.3V rails without level-shifting. |
| Active Current | 250 μA at 1 MHz, 2.2 V - allows continuous sensing and processing in energy-constrained nodes for months on small batteries. |
| Wake-up Time | <1 μs from standby - critical for duty-cycled sensor acquisition where latency must be minimized between events. |
| Operating Temp | -40°C to 85°C - qualified for industrial and automotive cabin applications without derating. |
| DCO Accuracy | ±1% with four factory-calibrated frequencies - eliminates need for external crystal in cost-sensitive timing applications. |
Pinout & Package
Package: 20-pin TSSOP (PW), body width 4.4 mm, JEDEC MO-153 compliant. Thermal pad not present; standard surface-mount reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TACLK | Timer_A clock input | Accepts external timing source for synchronous capture or gated counting - used in pulse-width or period measurement. |
| P1.1/TA0 | Timer_A channel 0 I/O | Configurable as CCI0A input (capture) or Out0 output (PWM) - primary signal interface for motor control or LED dimming. |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Provides SMCLK for peripheral synchronization or serves as TCK during debug - dual-use reduces pin count overhead. |
| P2.0/ACLK/CA2 | ACLK output / comparator input | Drives 32-kHz watch crystal oscillator or routes to comparator CA2 - enables low-power RTC or threshold-triggered wake-up. |
| RST/NMI | Reset / non-maskable interrupt | Hardware reset initiation and high-priority fault handling - essential for system recovery after brownout or watchdog timeout. |
| XIN/P2.6/CA6 | Clock input / comparator input | Connects to crystal or external clock; also functions as CA6 analog input - shared pin optimizes layout in space-constrained designs. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip emulation module (EEM) | Enables full-speed debugging and flash programming via JTAG without external emulator hardware - accelerates firmware validation. |
| Bootstrap loader (BSL) | UART-based in-system programming using P1.1/P2.2 - eliminates need for dedicated programmer in field updates or production line flashing. |
| Digital controlled oscillator (DCO) | Four factory-trimmed frequencies (1/8/12/16 MHz) with ±1% accuracy - replaces external crystal for cost-sensitive timing without sacrificing stability. |
| Analog comparator with slope ADC | Converts analog signals to digital values using Timer_A integration - achieves 10–12 bit resolution without dedicated ADC hardware. |
| Brownout detector | Monitors VCC and asserts RST/NMI below programmable threshold - prevents erratic operation during power ramp-up or battery sag. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity node transmitting data via sub-GHz RF transceiver. IC Role / Device Role: Central controller managing sensor readout, data preprocessing, low-power sleep scheduling, and RF interface timing. Use Value: 0.1 μA LPM4 current extends 10-year battery life; sub-1μs wake-up ensures precise event-triggered sampling without missing transients. |
Use Scenario: Wearable ECG front-end with analog signal conditioning and beat-detection logic. IC Role / Device Role: Analog comparator performs slope A/D on amplified ECG waveform; Timer_A integrates comparison duration for digital conversion. Use Value: Eliminates external ADC, reducing BOM count and PCB area while maintaining diagnostic-grade signal fidelity at ultra-low power. |
| Smart Utility Meter | Industrial Control Module |
|
Use Scenario: Tamper-resistant electricity meter logging consumption and detecting grid anomalies. IC Role / Device Role: Secure flash execution with BSL password protection; brownout detection prevents corrupted EEPROM writes during brownouts. Use Value: Factory-calibrated DCO ensures accurate timekeeping for billing intervals without quartz crystal cost or aging drift. |
Use Scenario: DIN-rail mounted PLC I/O module monitoring discrete inputs and driving relays. IC Role / Device Role: Real-time GPIO scanning with edge-triggered interrupts on all 16 I/O pins; Timer_A generates precise PWM for analog output scaling. Use Value: 16-bit timer resolution and interrupt priority handling guarantee deterministic response to fast-changing industrial signals. |
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 |
|---|---|---|---|
| MSP430F2131IDWR | 8KB flash, 256B RAM, same peripherals and pinout - direct memory upgrade path. | Supports larger firmware images (e.g., BLE stack + sensor fusion) without layout change. | Select when future firmware expansion or OTA update capability is required. |
| MSP430G2553IPW20 | 16KB flash, 512B RAM, enhanced USCI (UART/SPI/I2C), but no factory DCO calibration - requires external crystal for precision timing. | Better communication flexibility; less suitable for crystal-free timing-critical applications. | Choose when serial protocol support outweighs DCO accuracy needs and board space permits crystal placement. |
Compared with MSP430F2131IDWR, the MSP430F2121IDWR trades flash capacity for lower unit cost and identical low-power behavior; versus MSP430G2553IPW20, it offers superior DCO stability without crystal dependency but lacks hardware UART/I2C, making it optimal for minimal-footprint sensor controllers where timing autonomy is critical.
Availability
MSP430F2121IDWR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and smart utility meters requiring stable component supply across extended product lifecycles.
Supply support for MSP430F2121IDWR 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 focused on analog, embedded processing, and connectivity technologies, with decades of expertise in ultra-low-power design.
The MSP430F2121IDWR belongs to the MSP430x21x1 series-designed specifically for battery-operated measurement and sensing applications where nanowatt-level standby current and rapid wake-up are mandatory.
FAQ
What is the maximum operating frequency of the MSP430F2121IDWR?
The MSP430F2121IDWR supports a maximum MCLK frequency of 16 MHz when VCC ≥3.3 V and duty cycle is 50% ±10%. This is achieved using the factory-calibrated internal DCO, eliminating the need for an external high-frequency crystal while maintaining ±1% accuracy across temperature and voltage.
Does the MSP430F2121IDWR include hardware UART or I²C interfaces?
No, the MSP430F2121IDWR does not integrate hardware UART or I²C peripherals. Communication must be implemented via software bit-banging or by using Timer_A and GPIO resources. For hardware serial support, consider the MSP430G2553IPW20, which includes USCI modules supporting UART, SPI, and I²C.
How is flash programming performed on the MSP430F2121IDWR?
Flash programming on the MSP430F2121IDWR can be done via JTAG using tools like MSP-FET430UIF, or through the onboard bootstrap loader (BSL) using UART on P1.1 (TX) and P2.2 (RX). The BSL requires no external programming voltage and supports password-protected access for secure field updates.
What package type does the MSP430F2121IDWR use?
The MSP430F2121IDWR uses a 20-pin TSSOP (Thin Shrink Small Outline Package), designated as PW in TI's packaging nomenclature. It measures 6.5 mm × 4.4 mm with 0.65 mm lead pitch and is RoHS-compliant and halogen-free.
Can the MSP430F2121IDWR operate from a single 1.8 V supply?
Yes, the MSP430F2121IDWR is fully specified to operate from 1.8 V to 3.6 V. At 1.8 V, it supports up to 6 MHz MCLK (DCO) and maintains full functionality including flash programming (minimum 2.2 V required only during write/erase cycles), making it ideal for single-cell lithium or alkaline battery systems.
MSP430F2121IDWR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F2121IDWR FAQ
1.How can I place an order for MSP430F2121IDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F2121IDWR 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 MSP430F2121IDWR reliable?
The price and inventory of MSP430F2121IDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F2121IDWR is usually 5 days.
3.What payment methods are accepted for MSP430F2121IDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F2121IDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F2121IDWR?
MSP430F2121IDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F2121IDWR 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 MSP430F2121IDWR?
For technical support, including MSP430F2121IDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F2121IDWR requirements.
6.How does Aetrix verify that MSP430F2121IDWR is sourced from the original manufacturer or authorized distributors?
All MSP430F2121IDWR 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 MSP430F2121IDWR meets industry standards.
7.What is the process for return or replacement of MSP430F2121IDWR?
All MSP430F2121IDWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F2121IDWR, 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 MSP430F2121IDWR part is unused and in its original packaging.
Return procedure for MSP430F2121IDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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