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Texas Instruments MSP430G2121IPW14R
- Part No.:
- MSP430G2121IPW14R
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MSP430G2121IPW14R.pdf
- Description:
- IC MCU 16BIT 1KB FLASH 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
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Product details
Overview
MSP430G2121IPW14R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller with 1 kB flash, 128 B RAM, 10 I/O pins, a 16-bit Timer_A with two capture/compare registers, and a Universal Serial Interface (USI) supporting SPI and I²C. It operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes requiring sub-µA standby current and fast wake-up.
For engineers reviewing the MSP430G2121IPW14R datasheet, MSP430G2121IPW14R pinout, MSP430G2121IPW14R application, or MSP430G2121IPW14R equivalent, key selection criteria include its 14-pin TSSOP package, absence of integrated ADC10 (distinguishing it from G2x31 variants), USI-based serial communication capability, and verified LPM4 current of 0.1 µA at 2.2 V.
Technical Context
The MSP430G2121IPW14R implements a 16-bit CPU with constant generators and seven addressing modes, enabling single-cycle register operations. Its basic clock module integrates a digitally controlled oscillator (DCO), internal low-frequency oscillator (VLO), and external 32-kHz crystal support - all configurable via BCSCTL registers.
Power management is handled through five software-selectable low-power modes (LPM0–LPM4), with LPM4 achieving 0.1 µA off-mode current while retaining RAM. The USI module provides hardware-level SPI/I²C protocol handling without CPU intervention, and Spy-Bi-Wire enables in-system programming and debugging via two pins (TEST/SBWTCK and RST/NMI/SBWTDIO).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 registers and 51-instruction set; supports byte/word operations and seven addressing modes for efficient embedded code. |
| Memory | 1 kB flash (main memory) + 256 B information memory + 128 B RAM; flash programmable via Spy-Bi-Wire with segment erase capability. |
| Operating Voltage | 1.8 V to 3.6 V; supports stable operation down to 1.8 V, enabling direct use with single-cell Li-ion or two-cell alkaline batteries. |
| Ultra-Low Power | Active mode: 220 µA at 1 MHz/2.2 V; LPM4 (RAM retention): 0.1 µA - enables multi-year battery life in intermittent-sensing applications. |
| Timer & Peripherals | 16-bit Timer_A2 with two capture/compare registers; no ADC10 (confirmed per Table 1); USI supports full-duplex SPI and 7-bit I²C master/slave. |
| Clock System | Digital Controlled Oscillator (DCO) calibrated to 1 MHz, 8 MHz, 12 MHz, and 16 MHz; internal VLO (~12 kHz); external 32-kHz crystal support via XIN/XOUT pins. |
| Package | 14-pin TSSOP (PW), 5.0 mm × 4.4 mm × 1.2 mm body; RoHS-compliant; thermal pad not present (unlike QFN variants). |
Pinout & Package
Package: 14-pin Plastic Small-Outline Thin (TSSOP), PW suffix. Body dimensions 5.0 mm × 4.4 mm × 1.2 mm, pitch 0.65 mm. No exposed thermal pad. Compatible with standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DVCC) | Power supply | Main digital supply input; requires local 100 nF decoupling to DVSS (pin 14) for stable core operation. |
| 14 (DVSS) | Ground reference | Digital ground return; must be connected to system ground plane with low-inductance path to minimize noise coupling. |
| 10 (RST/NMI/SBWTDIO) | Reset & debug I/O | Active-low reset input; also serves as non-maskable interrupt and Spy-Bi-Wire data I/O during programming/debugging. |
| 11 (TEST/SBWTCK) | Debug clock input | Test mode select during fuse programming; functions as Spy-Bi-Wire clock input for in-circuit emulation and flash programming. |
| 12 (XOUT/P2.7) | Oscillator output / GPIO | Crystal oscillator output when using external 32-kHz watch crystal; otherwise configurable as general-purpose I/O (P2.7). |
| 13 (XIN/P2.6/TA0.1) | Oscillator input / timer / GPIO | Crystal oscillator input; also TA0.1 capture/compare channel and P2.6 I/O - shared function requires careful pinmux configuration. |
| P1.0–P1.7 | General-purpose I/O | Eight individually configurable bidirectional pins (P1.0–P1.7); each supports pull-up/down resistors, edge-selectable interrupts, and peripheral function mapping (e.g., SMCLK, SCLK, SDO, SDA). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power LPM4 mode | 0.1 µA at 2.2 V with RAM retention - enables energy harvesting and coin-cell-powered designs with years of shelf life. |
| Spy-Bi-Wire interface | Two-pin (TEST + RST) in-system programming and debugging - eliminates need for full 4-pin JTAG header, saving PCB space and BOM cost. |
| USI serial engine | Hardware-accelerated SPI/I²C with independent shift register and clock control - reduces CPU load and power during sensor data acquisition and transmission. |
| Fast wake-up from LPM3/LPM4 | < 1 µs wake-up time from standby - critical for duty-cycled wireless sensor nodes requiring rapid response to external events. |
| Calibrated DCO | Factory-trimmed DCO frequencies at 1/8/12/16 MHz - eliminates need for external crystal in cost-sensitive timing applications where ±3% accuracy suffices. |
Applications
| Smart Utility Meter Sensor Node | Wireless Temperature Monitor |
|---|---|
Use Scenario: Battery-powered endpoint collecting gas/flow meter pulses and transmitting via sub-GHz RF transceiver. IC Role / Device Role / Timing Role: Main controller managing pulse counting via P1.0 interrupt, SPI communication with RF IC, and LPM4 sleep between readings. Use Value: 0.1 µA LPM4 current extends 2xAA battery life beyond 10 years; USI offloads SPI timing, reducing active time and total energy per transmission. |
Use Scenario: Compact indoor temperature/humidity sensor logging data every 5 minutes and uploading via Bluetooth LE. IC Role / Device Role / Timing Role: Host MCU interfacing with I²C temperature sensor (e.g., TMP102), managing real-time clock via ACLK, and controlling BLE module via USI. Use Value: 1.8 V minimum supply allows direct connection to single LiPo cell; calibrated DCO eliminates crystal BOM cost while maintaining sufficient timing accuracy for BLE advertising intervals. |
| Industrial Asset Tag | Low-Cost Remote Control Transmitter |
Use Scenario: Passive NFC/RFID tag with supplemental sensing (vibration, tilt) powered by energy harvesting. IC Role / Device Role / Timing Role: Event-driven controller waking on accelerometer interrupt (P1.1), sampling analog inputs via external ADC, and storing data in RAM before RF transmission. Use Value: Sub-µA standby enables operation under microwatt harvesting; 10 I/O pins support direct connection to multiple sensors without level-shifting or bus expansion. |
Use Scenario: IR remote control for consumer electronics with button matrix scanning and NEC/RC-5 encoding. IC Role / Device Role / Timing Role: Dedicated encoder MCU generating precise carrier frequency (38 kHz) using Timer_A PWM output on P1.2 and managing key scan via P1.3–P1.7. Use Value: 16-bit Timer_A with dual compare registers enables accurate IR carrier generation and modulation timing; 14-pin TSSOP fits compact remote PCB layouts. |
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 |
|---|---|---|---|
| MSP430G2221IPW14R | Same package and pinout; includes 10-bit ADC10 with 8-channel autoscan - adds analog sensing capability not present in MSP430G2121IPW14R. | Required where on-chip analog signal acquisition (e.g., thermistor, potentiometer) is needed without external ADC. | Select when analog input integration justifies added cost and complexity; verify ADC10 reference and sampling rate requirements match design. |
| MSP430FR2111IPW14R | Ferroelectric RAM (FRAM) instead of flash; 1 kB FRAM + 128 B RAM; same USI, Timer_A, and LPM4 current (0.3 µA vs 0.1 µA); higher max frequency (16 MHz at 1.8 V). | Better endurance and write speed for frequent data logging; slightly higher active current; no factory DCO calibration at 1 MHz. | Prefer for high-write-cycle applications (e.g., black-box logging); accept minor standby current increase for FRAM reliability and zero-write-delay performance. |
Compared with MSP430G2121IPW14R, the MSP430G2221IPW14R adds integrated ADC10 but increases cost and power in active mode, while the MSP430FR2111IPW14R trades flash for FRAM to enable unlimited write cycles and faster firmware updates - both require validation of peripheral register compatibility and toolchain support.
Availability
MSP430G2121IPW14R is available at Aetrix Electronics and suitable for smart utility metering, industrial asset tracking, wireless sensor networks, and battery-powered remote controls requiring stable component supply and long-term production continuity.
Supply support for MSP430G2121IPW14R 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 expertise in ultra-low-power microcontrollers for industrial and sensing applications.
The MSP430G2xx series was designed specifically for cost-sensitive, battery-operated measurement systems requiring extended runtime, robust peripheral integration, and minimal external components - positioning MSP430G2121IPW14R as a foundational device for entry-level IoT endpoints.
FAQ
Does MSP430G2121IPW14R include an integrated analog-to-digital converter (ADC)?
No, MSP430G2121IPW14R does not include an ADC. Per Table 1 in the SLAS694J datasheet, the G2x21 family (including MSP430G2121IPW14R) lacks ADC10 functionality, unlike the G2x31 family. Designers requiring analog input must use external ADCs or select MSP430G2221IPW14R, which includes a 10-bit ADC10 with 8-channel autoscan capability.
What is the maximum operating frequency of MSP430G2121IPW14R at 1.8 V?
The maximum MCLK frequency for MSP430G2121IPW14R at 1.8 V is 6 MHz, as specified in the Recommended Operating Conditions table (Section 6.3). This limit ensures reliable operation across temperature and process variations; exceeding it may cause timing violations or undefined behavior in the CPU or peripherals.
Can MSP430G2121IPW14R support I²C communication in slave mode?
Yes, MSP430G2121IPW14R supports I²C slave mode via its Universal Serial Interface (USI) module. The USI implements hardware-level I²C protocol handling including address matching, ACK/NACK generation, and clock stretching - confirmed in Section 1.1 Features and USI register descriptions in the datasheet.
Is MSP430G2121IPW14R pin-compatible with other devices in the MSP430G2xx family?
MSP430G2121IPW14R shares the same 14-pin TSSOP (PW) package footprint and pin assignments with MSP430G2221IPW14R and MSP430G2131IPW14R, as shown in the Device Pinout diagrams. However, functional differences (e.g., presence/absence of ADC10, USI configuration) require firmware and schematic review before substitution.
What debug interface does MSP430G2121IPW14R use, and how many pins are required?
MSP430G2121IPW14R uses the Spy-Bi-Wire (SBW) debug interface, requiring only two pins: TEST/SBWTCK (pin 11) and RST/NMI/SBWTDIO (pin 10). This two-wire interface supports full in-system programming, breakpoint debugging, and memory access - eliminating the need for a 4-pin JTAG header and reducing PCB routing complexity.
MSP430G2121IPW14R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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:
- 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:
MSP430G2121IPW14R FAQ
1.How can I place an order for MSP430G2121IPW14R through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430G2121IPW14R 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 MSP430G2121IPW14R reliable?
The price and inventory of MSP430G2121IPW14R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430G2121IPW14R is usually 5 days.
3.What payment methods are accepted for MSP430G2121IPW14R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430G2121IPW14R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430G2121IPW14R?
MSP430G2121IPW14R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430G2121IPW14R 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 MSP430G2121IPW14R?
For technical support, including MSP430G2121IPW14R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430G2121IPW14R requirements.
6.How does Aetrix verify that MSP430G2121IPW14R is sourced from the original manufacturer or authorized distributors?
All MSP430G2121IPW14R 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 MSP430G2121IPW14R meets industry standards.
7.What is the process for return or replacement of MSP430G2121IPW14R?
All MSP430G2121IPW14R units undergo pre-shipment inspection (PSI). If there is an issue with MSP430G2121IPW14R, 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 MSP430G2121IPW14R part is unused and in its original packaging.
Return procedure for MSP430G2121IPW14R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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