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Texas Instruments MSP430G2221IRSA16R
- Part No.:
- MSP430G2221IRSA16R
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MSP430G2221IRSA16R.pdf
- Description:
- IC MCU 16BIT 2KB FLASH 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MSP430G2221IRSA16R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 2 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 delivers active-mode current of 220 µA at 1 MHz/2.2 V - optimized for battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430G2221IRSA16R datasheet, MSP430G2221IRSA16R pinout, MSP430G2221IRSA16R application, or MSP430G2221IRSA16R equivalent, this page provides verified technical context, QFN-16 package mapping, confirmed I/O and peripheral capabilities, and validated alternative options for low-power embedded design.
Technical Context
The MSP430G2221IRSA16R implements a 16-bit RISC CPU with 62.5-ns instruction cycle time and integrated constant generators for code efficiency. Its clock system combines a digitally controlled oscillator (DCO), internal low-frequency oscillator (VLO), and external 32-kHz crystal support - enabling sub-1-µs wake-up from LPM4 standby mode.
It integrates a Universal Serial Interface (USI) supporting both SPI and I²C protocols, eight programmable I/O pins on Port P1 plus two on Port P2, and Spy-Bi-Wire on-chip emulation logic. Unlike the G2x31 series, it omits the ADC10 module - confirmed by Table 1 and functional block diagrams.
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 - enables deterministic real-time control in compact firmware. |
| Memory | 2 kB flash program memory + 128 B RAM - sufficient for sensor preprocessing, protocol stacks, and low-complexity control loops without external memory. |
| Supply Voltage | 1.8 V to 3.6 V operating range - supports direct connection to single-cell Li-ion, LiFePO₄, or dual-AA alkaline batteries. |
| Ultra-Low Power | 0.1 µA in LPM4 (RAM retention) and 0.5 µA in LPM3 - extends multi-year operation in energy-harvesting or coin-cell applications. |
| Timer & Peripherals | 16-bit Timer_A2 with two capture/compare registers, USI (SPI/I²C), brownout detector, and five software-selectable low-power modes - enables precise timing, serial communication, and robust power management. |
| Package | 16-pin QFN (RSA), 3 mm × 3 mm, 0.5 mm pitch - surface-mount compatible with high-density PCB layouts and automated assembly. |
| Operating Temperature | –40°C to +85°C (I version) - qualified for industrial and outdoor environmental monitoring deployments. |
Pinout & Package
Package: 16-pin QFN (RSA), 3 mm × 3 mm body, exposed thermal pad connected to DVSS per TI package drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVCC (Pins 15, 16) | Power supply | Dual 1.8–3.6 V supply inputs - decoupling required per TI layout guidelines to ensure stable core and I/O voltage domains. |
| DVSS (Pins 13, 14) | Ground reference | Primary digital ground return path - must be connected to low-impedance plane; QFN thermal pad also tied to DVSS. |
| P1.0–P1.7 (Pins 1–8) | General-purpose I/O | Eight bidirectional pins with individually configurable pull-up/down resistors, interrupt edge select, and port-level masking - supports button sensing, LED drive, and GPIO-based protocols. |
| P2.6, P2.7 (Pins 12, 13) | General-purpose I/O | Two additional I/O pins - P2.6 shares TA0.1 function; P2.7 is XOUT and can serve as crystal output or general-purpose output. |
| RST/NMI/SBWTDIO (Pin 9) | Reset & debug I/O | Active-low reset input, non-maskable interrupt, and Spy-Bi-Wire data I/O - enables in-system programming and debugging without JTAG header. |
| TEST/SBWTCK (Pin 10) | Debug clock | Test mode selection and Spy-Bi-Wire clock input - used exclusively during programming; must be pulled low during normal operation. |
| XIN (Pin 12) | Clock input | Crystal oscillator input for 32.768 kHz watch crystal - enables precise real-time clock operation and low-power LPM3/LPM4 timing. |
| XOUT (Pin 11) | Clock output | Crystal oscillator output - drives external load capacitance; not usable as general-purpose I/O unless crystal disabled via BCSCTL3. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 µs wake-up from LPM4 | Enables rapid response to external events (e.g., motion trigger) while maintaining <0.1 µA sleep current - critical for duty-cycled sensor sampling. |
| Integrated USI (SPI/I²C) | Hardware-accelerated synchronous serial interface eliminates bit-banging overhead - reduces CPU load and improves timing accuracy in multi-device sensor networks. |
| Brownout detector | Prevents erratic operation during battery voltage sag by asserting reset below programmable threshold - ensures reliable boot and state recovery. |
| Five low-power modes | LPM0–LPM4 offer granular trade-offs between wake-up latency and current draw - allows matching power profile to application event rate and latency requirements. |
| Spy-Bi-Wire emulation | Two-wire debug interface uses only RST/NMI and TEST pins - simplifies PCB layout and eliminates need for dedicated JTAG connector or routing space. |
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 / Timing Role: Main controller managing sensor readout, data formatting, low-power scheduling, and RF interface timing. Use Value: 0.1 µA LPM4 current extends 10-year battery life on CR2032; USI handles SPI to RF IC; sub-1 µs wake-up synchronizes with RF preamble detection. |
Use Scenario: Handheld pulse oximeter with OLED display and button interface. IC Role / Device Role / Timing Role: System manager coordinating LED driver timing, analog front-end sampling, display refresh, and user input polling. Use Value: 220 µA active current at 1 MHz enables responsive UI updates; brownout detection prevents corrupted measurements during battery depletion. |
| Industrial Control Panel | Smart Meter Tamper Detection |
|
Use Scenario: DIN-rail mounted HMI with pushbuttons, LEDs, and RS-485 interface. IC Role / Device Role / Timing Role: Local intelligence unit handling button debouncing, LED PWM, and UART-to-RS485 translation. Use Value: Eight P1 I/O pins directly drive buttons and LEDs; USI configured as SPI controls isolated RS-485 transceiver; LPM3 maintains 0.5 µA sleep current during idle periods. |
Use Scenario: Electricity meter detecting case opening or magnetic tampering via reed switch and Hall sensor. IC Role / Device Role / Timing Role: Low-power event monitor sampling discrete inputs and triggering secure log entries or alert signals. Use Value: Sub-1 µs wake-up ensures no tamper event is missed; brownout protection guarantees valid logging even during voltage dips caused by magnetic interference. |
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 |
|---|---|---|---|
| MSP430G2231IRSA16 | Includes 10-bit ADC10 with 8-channel autoscan; identical package, memory, and peripherals otherwise. | Required when analog sensor interfacing (e.g., thermistor, potentiometer) is needed without external ADC. | Select MSP430G2231IRSA16 if ADC functionality is essential; otherwise MSP430G2221IRSA16 offers lower cost and same power/performance for digital-only use cases. |
| MSP430FR2111IPW14 | Ferroelectric RAM (FRAM) instead of flash; 1 kB FRAM + 512 B RAM; TSSOP-14 package; no USI (only eUSCI_A0 UART/SPI/I²C). | Preferred for frequent write-intensive logging or where flash endurance is limiting; different pin count and peripheral set. | Choose MSP430FR2111IPW14 for high-cycle data logging; MSP430G2221IRSA16 remains optimal for cost-sensitive, low-power, SPI/I²C-based control with QFN footprint. |
Compared with MSP430G2231IRSA16, the MSP430G2221IRSA16 removes ADC10 to reduce cost and power in digital-only roles; versus MSP430FR2111IPW14, it retains flash, USI, and QFN-16 compatibility but lacks FRAM's write endurance - making it ideal for fixed-function, low-update-rate embedded controllers.
Availability
MSP430G2221IRSA16R is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, industrial control panels, and smart meter tamper detection requiring stable component supply across long-lifecycle production programs.
Supply support for MSP430G2221IRSA16R 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.
The MSP430G2xx family targets ultra-low-power mixed-signal applications - delivering extended battery life in portable instrumentation, sensor systems, and energy-constrained IoT endpoints through optimized architecture and aggressive power gating.
FAQ
What is the maximum operating frequency of the MSP430G2221IRSA16R?
The MSP430G2221IRSA16R supports up to 16 MHz MCLK at VCC ≥ 3.3 V, 12 MHz at VCC ≥ 2.7 V, and 6 MHz at VCC = 1.8 V. These limits are defined by DCO stability and timing margins - exceeding them risks instruction corruption or peripheral malfunction. The device achieves full performance within these ranges while maintaining ultra-low power consumption in all operating modes.
Does the MSP430G2221IRSA16R include an analog-to-digital converter (ADC)?
No, the MSP430G2221IRSA16R does not include an ADC. This is explicitly confirmed in Table 1 of the SLAS694J datasheet, where the ADC10 column shows "–" for all MSP430G2x21 variants. In contrast, the MSP430G2x31 series (e.g., MSP430G2231IRSA16) includes a 10-bit ADC10 module. For analog sensing, external ADCs or alternative MSP430G2x31 devices must be used.
What debug interface does the MSP430G2221IRSA16R support?
The MSP430G2221IRSA16R supports Spy-Bi-Wire (SBW) via RST/NMI/SBWTDIO (Pin 9) and TEST/SBWTCK (Pin 10). This two-wire interface enables full in-system programming, breakpoint setting, and register inspection using TI's MSP-FET or compatible tools. JTAG is not supported on this device - SBW is the sole standardized debug method, requiring no additional pins beyond the reset/debug pair.
Can the MSP430G2221IRSA16R operate from a single 1.8 V supply?
Yes, the MSP430G2221IRSA16R is fully specified to operate from 1.8 V to 3.6 V. At 1.8 V, it supports up to 6 MHz MCLK (dc operation), delivers 220 µA active current at 1 MHz, and maintains 0.1 µA LPM4 current. All I/O pins are 3.6-V tolerant, allowing safe interfacing with higher-voltage peripherals even when powered at 1.8 V.
What is the purpose of the QFN thermal pad on the MSP430G2221IRSA16R?
The exposed thermal pad on the MSP430G2221IRSA16R QFN package must be soldered to a DVSS copper plane to ensure proper thermal dissipation and electrical grounding. TI documentation specifies this connection as mandatory for reliable operation - it reduces junction temperature under sustained active-mode operation and stabilizes ground reference for analog and digital circuits. Omitting pad connection risks thermal shutdown or increased noise susceptibility.
MSP430G2221IRSA16R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-VQFN Exposed Pad
- Series:
- MSP430G2xx
- Packaging:
- Tape & Reel (TR)
- 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:
- 2KB (2K 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:
MSP430G2221IRSA16R FAQ
1.How can I place an order for MSP430G2221IRSA16R through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430G2221IRSA16R 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 MSP430G2221IRSA16R reliable?
The price and inventory of MSP430G2221IRSA16R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430G2221IRSA16R is usually 5 days.
3.What payment methods are accepted for MSP430G2221IRSA16R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430G2221IRSA16R transactions.
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4.How is shipping managed for MSP430G2221IRSA16R?
MSP430G2221IRSA16R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430G2221IRSA16R 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 MSP430G2221IRSA16R?
For technical support, including MSP430G2221IRSA16R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430G2221IRSA16R requirements.
6.How does Aetrix verify that MSP430G2221IRSA16R is sourced from the original manufacturer or authorized distributors?
All MSP430G2221IRSA16R 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 MSP430G2221IRSA16R meets industry standards.
7.What is the process for return or replacement of MSP430G2221IRSA16R?
All MSP430G2221IRSA16R units undergo pre-shipment inspection (PSI). If there is an issue with MSP430G2221IRSA16R, 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 MSP430G2221IRSA16R part is unused and in its original packaging.
Return procedure for MSP430G2221IRSA16R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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