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Texas Instruments MSP430G2121IPW14
- Part No.:
- MSP430G2121IPW14
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MSP430G2121IPW14.pdf
- Description:
- IC MCU 16BIT 1KB FLASH 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:519
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Product details
Overview
MSP430G2121IPW14 from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller in a 14-pin TSSOP package, featuring 1 kB Flash, 128 B RAM, a 16-bit Timer_A with two capture/compare registers, brownout detection, and five power-saving modes. It operates from 1.8 V to 3.6 V and supports Spy-Bi-Wire programming for embedded sensor node control.
For engineers reviewing the MSP430G2121IPW14 datasheet, MSP430G2121IPW14 pinout, MSP430G2121IPW14 application, or MSP430G2121IPW14 equivalent, this device serves as a cost-optimized, battery-efficient MCU for low-pin-count analog-sensing and serial interface tasks where ADC10 or USI-based I²C/SPI are not required - distinguishing it from the G2x31 family variants.
Technical Context
The MSP430G2121IPW14 implements a 16-bit CPU with constant generators and seven addressing modes, executing register-to-register instructions in one MCLK cycle. Its basic clock module integrates a digitally controlled oscillator (DCO), internal very-low-power LF oscillator, and 32-kHz crystal support - enabling sub-1 µs wake-up from LPM4.
It includes Port P1 (8-bit) and Port P2 (2-bit) with individually configurable direction, pull-up/down resistors, and edge-selectable interrupts. The WDT+ module functions as either a system watchdog or interval timer, while Timer_A2 provides PWM, capture, and compare capabilities without ADC or USI peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 registers and 51-instruction set; enables efficient C compilation and deterministic real-time execution. |
| Memory | 1 kB Flash (main memory) + 256 B information memory + 128 B RAM; supports in-system programming via Spy-Bi-Wire. |
| Supply Voltage | 1.8 V to 3.6 V operating range; allows direct use with single-cell Li-ion, alkaline, or coin-cell batteries. |
| Power Consumption | Active mode: 220 µA at 1 MHz / 2.2 V; LPM4 (RAM retention): 0.1 µA - optimized for multi-year battery life in intermittent sensing. |
| Timer Resource | Timer_A2 with two capture/compare registers (TA0.0, TA0.1); supports PWM generation, input capture, and interval timing without external components. |
| Clock Sources | Internal DCO (calibrated up to 16 MHz), internal VLO (~12 kHz), and external 32-kHz crystal; no external high-frequency crystal required for basic timing. |
| Operating Temperature | –40°C to +85°C (I version); qualified for industrial-grade deployment in metering, wearables, and environmental monitors. |
Pinout & Package
Package: 14-pin Plastic Small-Outline Thin (TSSOP), PW suffix, body size 5.0 mm × 4.4 mm, 0.65 mm pitch. RoHS-compliant, lead-free, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, DVCC | Power supply | Primary digital supply input (1.8–3.6 V); must be decoupled locally with 100 nF ceramic capacitor. |
| 14, DVSS | Ground reference | Digital ground return; requires low-impedance connection to system ground plane. |
| P1.0/TA0CLK/ACLK | Multi-function I/O | Configurable as Timer_A clock input, auxiliary clock output, or general-purpose I/O with interrupt capability. |
| P1.1/TA0.0 | Timer capture/compare | Timer_A channel 0 input/output; supports edge-triggered capture or PWM output on P1.1. |
| P1.2/TA0.1 | Timer capture/compare | Timer_A channel 1 input/output; supports second PWM output or input capture independent of P1.1. |
| P1.3 | General-purpose I/O | Dedicated digital I/O with programmable pull-up/down and interrupt-on-change; no analog function. |
| P1.4/SMCLK/TCK | System clock / JTAG | Sub-main clock output or JTAG test clock input; shared pin requires careful mode selection during debug vs runtime. |
| P1.5/TA0.0/SCLK/TMS | Timer / JTAG | Timer_A channel 0 output or JTAG test mode select; dual-use pin mandates static configuration in production firmware. |
| P1.6/TA0.1/SDO/SCL/TDI/TCLK | Timer / JTAG | Timer_A channel 1 output or JTAG test data input; not used for USI or ADC in MSP430G2121IPW14 variant. |
| P1.7/SDI/SDA/TDO/TDI | JTAG | JTAG test data I/O; dedicated to Spy-Bi-Wire or full JTAG debugging; no USI or ADC function in this part. |
| RST/NMI/SBWTDIO | Reset / debug I/O | Active-low reset input, non-maskable interrupt, and bidirectional Spy-Bi-Wire data line; critical for programming and recovery. |
| TEST/SBWTCK | Debug clock | Test mode select and Spy-Bi-Wire clock input; must be pulled low during normal operation to disable test mode. |
| XIN/P2.6/TA0.1 | Clock input / I/O | Crystal oscillator input or general-purpose I/O; when used as TA0.1, enables third timer output path. |
| XOUT/P2.7 | Clock output | Crystal oscillator output; must remain unconnected if internal DCO or VLO is used exclusively. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 0.1 µA in LPM4 with RAM retention enables decade-scale battery life in energy-harvesting or coin-cell applications. |
| Spy-Bi-Wire programming | Two-wire debug interface eliminates need for external programming voltage or full JTAG header, reducing PCB footprint and BOM cost. |
| Calibrated DCO | Firmware-accessible factory-trimmed DCO calibration data (CALBC1_1MHZ/CALDCO_1MHZ) ensures ±3% frequency accuracy without external crystal. |
| Five software-selectable LPMs | LPM0–LPM4 provide granular power control: LPM3 (0.7 µA @ 2.2 V) retains ACLK and RAM; LPM4 (0.1 µA) shuts down all clocks except SRAM. |
| Integrated brownout detector | Monitors VCC and asserts reset below threshold - prevents erratic code execution during battery sag or cold-start conditions. |
Applications
| Smart Sensor Node | Industrial Control Interface |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via UART or GPIO-triggered RF module. IC Role / Device Role / Timing Role: Main controller managing sensor readout, low-power sleep/wake cycles, and timing-critical UART bit-banging or SPI slave interface. Use Value: 0.1 µA LPM4 current extends CR2032 battery life beyond 5 years; calibrated DCO eliminates crystal cost and layout area. |
Use Scenario: DIN-rail mounted I/O expander for PLC remote terminal units, monitoring discrete inputs and driving LED indicators. IC Role / Device Role / Timing Role: Local intelligence layer handling debounce, state machine logic, and isolated GPIO signaling with precise timing for status updates. Use Value: 10 I/O pins (P1.0–P1.7 + P2.6–P2.7) support direct connection to optocouplers or LEDs; brownout protection ensures reliable reset during AC line dips. |
| Portable Medical Monitor | Energy Harvesting Endpoint |
|
Use Scenario: Wearable pulse oximeter using photodiode signals conditioned by external op-amps and digitized via external ADC. IC Role / Device Role / Timing Role: System orchestrator managing LED drive timing, signal acquisition triggers, and Bluetooth LE packet assembly via UART. Use Value: Sub-1 µs wake-up from LPM4 enables precise synchronization with external ADC conversion windows; 1.8 V minimum supply supports direct harvesting from piezoelectric sources. |
Use Scenario: Solar-charged soil moisture sensor node waking hourly to measure capacitance and transmit via LoRaWAN gateway. IC Role / Device Role / Timing Role: Power-aware scheduler initiating measurement sequence, managing charge-level monitoring, and controlling RF transceiver enable timing. Use Value: LPM3 (0.7 µA) maintains RTC via ACLK from 32-kHz crystal while preserving RAM state; no USI or ADC reduces leakage paths for ultra-low quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430G2221IPW14 | 2 kB Flash, same 128 B RAM, identical pinout and peripherals - adds one additional Timer_A capture/compare register (TA0.2). | Supports three-channel PWM or more complex timing sequences; suitable when extended timer flexibility is needed without ADC or USI. | Select MSP430G2221IPW14 if firmware growth or future timing requirements exceed single-TA2 capacity; same PCB layout applies. |
| MSP430G2111IPW14 | 512 B Flash, 128 B RAM, same core and LPMs - lacks Timer_A entirely; only supports basic WDT+ and GPIO. | Targeted at minimal state machines or GPIO sequencers; insufficient for PWM, capture, or time-based sampling. | Choose MSP430G2111IPW14 only for fixed-function logic with no timing dependencies beyond WDT intervals; not software-compatible. |
Compared with MSP430G2121IPW14, the MSP430G2221IPW14 offers scalable Flash and enhanced Timer_A capability within identical power and packaging constraints, while the MSP430G2111IPW14 trades timer functionality for lower cost and smaller code footprint - making the G2121 the optimal balance of timing capability, memory, and ultra-low-power efficiency.
Availability
MSP430G2121IPW14 is available at Aetrix Electronics and suitable for smart sensor nodes, industrial control interfaces, and portable medical monitors requiring stable component supply across long-lifecycle deployments.
Supply support for MSP430G2121IPW14 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 with emphasis on energy efficiency and system integration.
The MSP430G2xx series targets ultra-low-power embedded applications including battery-operated sensors, meters, and portable instrumentation - designed to maximize operational lifetime while minimizing bill-of-materials cost and board space.
FAQ
What is the maximum operating frequency of the MSP430G2121IPW14?
The MSP430G2121IPW14 supports a maximum MCLK frequency of 16 MHz at VCC ≥ 3.3 V, 12 MHz at VCC ≥ 2.7 V, and 6 MHz at VCC = 1.8 V. This is achieved using the factory-calibrated internal DCO, eliminating the need for an external high-frequency crystal while maintaining timing precision within ±3% across voltage and temperature.
Does the MSP430G2121IPW14 include an ADC or USI peripheral?
No, the MSP430G2121IPW14 does not include ADC10 or USI hardware. It belongs to the G2x21 subfamily, which omits these modules to reduce cost and power - unlike the G2x31 family (e.g., MSP430G2231IPW14) that integrates both. All I/O pins are digital-only, with no analog input capability.
How many I/O pins does the MSP430G2121IPW14 provide?
The MSP430G2121IPW14 provides 10 usable I/O pins: eight bits on Port P1 (P1.0–P1.7) and two bits on Port P2 (P2.6–P2.7). All support individual direction control, programmable pull-up/down resistors, and interrupt-on-change functionality - sufficient for compact sensor interfaces or discrete I/O expansion.
What debug interface does the MSP430G2121IPW14 support?
The MSP430G2121IPW14 supports Spy-Bi-Wire (SBW), a two-wire debug interface using RST/NMI/SBWTDIO and TEST/SBWTCK pins. It enables full flash programming, breakpoint debugging, and memory inspection without requiring a 4-wire JTAG header - reducing PCB routing complexity and connector cost.
Is the MSP430G2121IPW14 compatible with the MSP430G2221IPW14 in terms of pinout and software?
Yes, the MSP430G2121IPW14 and MSP430G2221IPW14 share identical 14-pin TSSOP (PW) packaging, pin assignments, memory map layout, and instruction set. Firmware compiled for MSP430G2121IPW14 runs unchanged on MSP430G2221IPW14, though the latter unlocks additional Timer_A functionality and 1 kB extra Flash.
MSP430G2121IPW14 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Series:
- MSP430G2xx
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, SPI
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 10
- Program Memory Size:
- 1KB (1K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430G2121IPW14 FAQ
1.How can I place an order for MSP430G2121IPW14 through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430G2121IPW14 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 MSP430G2121IPW14 reliable?
The price and inventory of MSP430G2121IPW14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430G2121IPW14 is usually 5 days.
3.What payment methods are accepted for MSP430G2121IPW14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430G2121IPW14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430G2121IPW14?
MSP430G2121IPW14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430G2121IPW14 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 MSP430G2121IPW14?
For technical support, including MSP430G2121IPW14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430G2121IPW14 requirements.
6.How does Aetrix verify that MSP430G2121IPW14 is sourced from the original manufacturer or authorized distributors?
All MSP430G2121IPW14 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 MSP430G2121IPW14 meets industry standards.
7.What is the process for return or replacement of MSP430G2121IPW14?
All MSP430G2121IPW14 units undergo pre-shipment inspection (PSI). If there is an issue with MSP430G2121IPW14, 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 MSP430G2121IPW14 part is unused and in its original packaging.
Return procedure for MSP430G2121IPW14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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