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Texas Instruments MSP430G2231IPW14R

Name: MSP430G2231IPW14R
Brand: Texas Instruments
SKU: MSP430G2231IPW14R
Price: 2.40 USD
Availability: InStock
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Part No.:: MSP430G2231IPW14R

Manufacturer:: Texas Instruments

Category:: Microcontrollers

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: MSP430G2231IPW14R.pdf

Description:: IC MCU 16BIT 2KB FLASH 14TSSOP

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Product details

Overview

MSP430G2231IPW14R from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 2 kB flash, 128 B RAM, a 10-bit 200-ksps ADC with internal reference and autoscan, Timer_A2 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 analog acquisition, digital processing, and serial communication.

For engineers reviewing the MSP430G2231IPW14R datasheet, MSP430G2231IPW14R pinout, MSP430G2231IPW14R application, or MSP430G2231IPW14R equivalent, this page delivers verified technical context, exact pin functions, low-power operating mode behavior, ADC channel mapping, and validated alternative options for cost-optimized, energy-constrained embedded designs.

Technical Context

The MSP430G2231IPW14R implements a 16-bit RISC CPU with constant generators and 16 general-purpose registers, executing instructions in one MCLK cycle. Its clock system integrates a digitally controlled oscillator (DCO), internal very-low-power LF oscillator, and external 32-kHz crystal support - enabling sub-1-µs wake-up from LPM4 and stable timing across voltage and temperature.

Peripherals include a 10-bit SAR ADC with sample-and-hold, internal VREF+/VREF−, and 8-channel autoscan; USI configured for hardware SPI or I²C master/slave; Timer_A2 with dual compare/capture capability and interrupt on overflow, CCR0, and CCR1; and Spy-Bi-Wire debug interface with on-chip emulation logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	16-bit RISC CPU with 62.5-ns instruction cycle at 16 MHz; register-based execution enables high code efficiency in memory-constrained applications.
Flash / RAM	2 kB flash program memory and 128 B RAM - sufficient for firmware with ADC data buffering, USI protocol stacks, and timer-driven state machines.
ADC10	10-bit SAR converter with 200-ksps sampling rate, internal reference, sample-and-hold, and autoscan across 8 analog inputs - supports continuous sensor monitoring without CPU intervention.
Power Modes	Five software-selectable low-power modes; LPM4 draws 0.1 µA at 2.2 V - extends coin-cell battery life to multi-year operation in always-on sensing.
USI Interface	Universal Serial Interface supporting SPI (master/slave) and I²C (master only); uses P1.6/P1.7 for SCL/SDA or SDO/SDI - eliminates need for external level shifters in 3.3-V systems.
Timer_A2	16-bit timer with two capture/compare registers (TA0.0, TA0.1); supports PWM generation, input capture, interval timing, and interrupt on overflow or compare match.
Supply Range	1.8 V to 3.6 V operation - compatible with single-cell Li-ion, LiFePO₄, or dual-AA alkaline supplies without external regulators.

Pinout & Package

Package: 14-pin TSSOP (PW), 5.0 mm × 4.4 mm, 0.65 mm pitch, surface-mount. Pinout validated per TI SLAS694J Rev F (2013), Table 2 and Device Pinout diagrams for PW package.

Pin/Terminal	Circuit Role	Design Meaning
P1.0/TA0CLK/ACLK/A0	Port 1 bit 0 / Timer_A clock / Auxiliary clock output / ADC input A0	Multi-function I/O: configures as ADC channel 0, timer clock source, or ACLK output - enables synchronous sampling or clock distribution.
P1.1/TA0.0/A1	Port 1 bit 1 / Timer_A capture/compare 0 / ADC input A1	Supports edge-triggered capture, PWM output, or analog sensing - used for pulse-width measurement or sensor signal digitization.
P1.2/TA0.1/A2	Port 1 bit 2 / Timer_A capture/compare 1 / ADC input A2	Dual-role pin for second compare/capture event or analog input - allows simultaneous timing control and sensor reading.
P1.3/ADC10CLK/A3/VREF-/VEREF-	Port 1 bit 3 / ADC conversion clock / ADC negative reference	Configurable as ADC clock source or VREF−; when used as reference, enables ratiometric measurements against external sensors.
P1.4/SMCLK/TCK/A4/VREF+/VEREF+	Port 1 bit 4 / Sub-main clock output / JTAG test clock / ADC positive reference	Provides SMCLK for peripherals or VREF+ for ADC - critical for accurate 10-bit conversions when external reference is not used.
P1.5/TA0.0/SCLK/TMS/A5	Port 1 bit 5 / Timer_A compare 0 / USI clock / JTAG mode select / ADC input A5	Shared with USI SCLK in SPI mode - enables synchronous serial communication while retaining timer functionality via software reconfiguration.
P1.6/TA0.1/SDO/SCL/TDI/TCLK/A6	Port 1 bit 6 / Timer_A compare 1 / USI data out / I²C clock / JTAG test data in	Primary I²C SCL or SPI SDO pin - supports bidirectional communication protocols without external transceivers.
P1.7/SDI/SDA/TDO/TDI/A7	Port 1 bit 7 / USI data in / I²C data / JTAG test data out	Primary I²C SDA or SPI SDI pin - completes full-duplex serial interface using only two pins for sensor or EEPROM interfacing.
RST/NMI/SBWTDIO	Reset / non-maskable interrupt / Spy-Bi-Wire data I/O	Single-pin debug interface for programming and real-time debugging - reduces PCB footprint versus 4-pin JTAG.
TEST/SBWTCK	JTAG test mode select / Spy-Bi-Wire clock	Enables secure fuse programming and clock synchronization during device programming - required for BSL activation.
XIN/P2.6/TA0.1	Crystal input / Port 2 bit 6 / Timer_A compare 1	Accepts 32.768-kHz crystal for precise real-time clocking; also serves as GPIO or timer output when crystal not used.
XOUT/P2.7	Crystal output / Port 2 bit 7	Drives external crystal; configurable as GPIO - supports RTC or general-purpose I/O in space-constrained layouts.
DVSS	Digital ground (pins 13, 14)	Dual ground connections reduce noise coupling between analog and digital sections - improves ADC SNR in mixed-signal operation.
DVCC	Digital supply (pins 1, 15, 16)	Three supply pins ensure stable core voltage under transient current loads - critical for reliable flash programming and low-power mode transitions.

Key Features

Feature	Design Value
Ultra-low active current	220 µA at 1 MHz, 2.2 V - enables >1-year runtime on CR2032 when sampling sensors every 10 seconds.
Sub-1-µs wake-up from LPM4	DCO stabilizes in <1 µs - allows rapid response to external interrupts (e.g., motion detection) without timing jitter.
Integrated ADC reference	Internal VREF+/VREF− eliminates need for external precision references - reduces BOM count and layout area by 2 components.
Hardware USI for SPI/I²C	Dedicated USI module offloads bit-banging from CPU - frees 100% of CPU cycles for sensor fusion or wireless protocol handling.
Programmable code protection	Security fuse prevents unauthorized flash read-out - protects proprietary algorithms in commercial sensor firmware.
Spy-Bi-Wire debug	2-pin interface replaces 4-pin JTAG - saves PCB space and simplifies production programming fixtures.

Applications

Wireless Sensor Node	Portable Medical Monitor
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and light data, then transmitting via BLE or Sub-GHz radio. IC Role / Device Role / Timing Role: Central controller managing ADC sampling, USI communication with radio IC, and low-power scheduling via Timer_A2 and LPM3. Use Value: 0.7 µA LPM3 current with 32-kHz crystal enables multi-year operation; integrated ADC reference ensures consistent readings across voltage decay.	Use Scenario: Handheld pulse oximeter acquiring analog photodiode signals, computing SpO₂, and displaying results on segmented LCD. IC Role / Device Role / Timing Role: Signal processor performing synchronized dual-channel ADC sampling, LED timing control via PWM, and LCD segment driving. Use Value: 200-ksps ADC captures fast photoplethysmogram waveforms; 10-bit resolution supports clinical-grade saturation calculation accuracy.
Smart Utility Meter	Industrial Condition Monitor
Use Scenario: Tamper-resistant electricity meter measuring voltage/current via shunt or CT, calculating kWh, and reporting via PLC or RF mesh. IC Role / Device Role / Timing Role: Metrology engine executing RMS calculations, managing isolation interface via USI, and maintaining time-of-use logs using LPM3 + crystal. Use Value: Brownout detector prevents corrupted flash writes during grid sags; 1.8 V minimum supply supports operation during brownouts.	Use Scenario: Vibration sensor node mounted on motor housing, capturing accelerometer data, running FFT analysis, and triggering alerts on anomaly detection. IC Role / Device Role / Timing Role: Real-time data acquisition unit using ADC autoscan across 4 channels, Timer_A2 for precise sampling intervals, and USI for local CAN-to-SPI bridge. Use Value: 8-channel autoscan enables simultaneous multi-axis vibration capture; 128 B RAM buffers 64 samples before host retrieval.

Wireless Sensor Node

Portable Medical Monitor

Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and light data, then transmitting via BLE or Sub-GHz radio.

IC Role / Device Role / Timing Role: Central controller managing ADC sampling, USI communication with radio IC, and low-power scheduling via Timer_A2 and LPM3.

Use Value: 0.7 µA LPM3 current with 32-kHz crystal enables multi-year operation; integrated ADC reference ensures consistent readings across voltage decay.

Use Scenario: Handheld pulse oximeter acquiring analog photodiode signals, computing SpO₂, and displaying results on segmented LCD.

IC Role / Device Role / Timing Role: Signal processor performing synchronized dual-channel ADC sampling, LED timing control via PWM, and LCD segment driving.

Use Value: 200-ksps ADC captures fast photoplethysmogram waveforms; 10-bit resolution supports clinical-grade saturation calculation accuracy.

Smart Utility Meter

Industrial Condition Monitor

Use Scenario: Tamper-resistant electricity meter measuring voltage/current via shunt or CT, calculating kWh, and reporting via PLC or RF mesh.

IC Role / Device Role / Timing Role: Metrology engine executing RMS calculations, managing isolation interface via USI, and maintaining time-of-use logs using LPM3 + crystal.

Use Value: Brownout detector prevents corrupted flash writes during grid sags; 1.8 V minimum supply supports operation during brownouts.

Use Scenario: Vibration sensor node mounted on motor housing, capturing accelerometer data, running FFT analysis, and triggering alerts on anomaly detection.

IC Role / Device Role / Timing Role: Real-time data acquisition unit using ADC autoscan across 4 channels, Timer_A2 for precise sampling intervals, and USI for local CAN-to-SPI bridge.

Use Value: 8-channel autoscan enables simultaneous multi-axis vibration capture; 128 B RAM buffers 64 samples before host retrieval.

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
MSP430G2553IPW20R	20-pin TSSOP; 16 kB flash, 512 B RAM, 8-channel ADC, USCI (enhanced USI), hardware UART/I²C/SPI	Supports UART-based host communication and larger firmware; requires PCB redesign due to 20-pin footprint and different pin mapping	Select when firmware complexity exceeds 2 kB or UART interface is mandatory; not drop-in compatible.
STM32L011D4P6	16-pin TSSOP; ARM Cortex-M0+, 16 kB flash, 2 kB RAM, 12-bit ADC, hardware SPI/I²C/UART, no integrated crystal oscillator	Higher performance and memory; requires external 32-kHz crystal for RTC; lacks Spy-Bi-Wire - needs ST-LINK for programming	Choose for higher computational throughput or RTOS support; verify crystal load capacitance and debug toolchain compatibility.

Compared with MSP430G2553IPW20R and STM32L011D4P6, the MSP430G2231IPW14R offers the smallest footprint and lowest active/LPM4 current among validated alternatives, making it optimal for size- and energy-constrained designs where 2 kB flash and USI-level serial suffice.

Availability

MSP430G2231IPW14R is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial condition monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MSP430G2231IPW14R 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 design.

The MSP430G2xx family was engineered specifically for cost-sensitive, battery-operated applications demanding nanowatt-level power consumption, integrated analog peripherals, and minimal external components - exemplified by the MSP430G2231IPW14R's 2 kB flash, 10-bit ADC, and USI.

FAQ

What is the maximum system clock frequency supported by the MSP430G2231IPW14R?

The MSP430G2231IPW14R 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 governed by DCO calibration and voltage-dependent timing margins - the device achieves 16 MHz only when supplied with ≥3.3 V and operating within recommended temperature limits. The MSP430G2231IPW14R datasheet specifies these limits in the Recommended Operating Conditions table.

Does the MSP430G2231IPW14R include hardware UART support?

No, the MSP430G2231IPW14R does not include hardware UART. It features a Universal Serial Interface (USI) module that supports SPI and I²C protocols only. UART functionality must be implemented in software using Timer_A2 and GPIO pins - a common approach in ultra-low-power designs where asynchronous serial is infrequent. This limitation is explicitly documented in the MSP430G2231IPW14R functional block diagram and peripheral description.

How many ADC input channels are available on the MSP430G2231IPW14R?

The MSP430G2231IPW14R provides eight ADC input channels (A0–A7), mapped to P1.0 through P1.7 and XIN/XOUT pins. All eight channels support autoscan mode, allowing sequential conversion without CPU intervention. This capability is confirmed in Table 2 (Terminal Functions) and the ADC10 section of the MSP430G2231IPW14R datasheet SLAS694J.

What debug interface does the MSP430G2231IPW14R use?

The MSP430G2231IPW14R uses the Spy-Bi-Wire (SBW) interface, a 2-pin variant of JTAG implemented on RST/NMI/SBWTDIO and TEST/SBWTCK pins. It supports full-speed programming, real-time debugging, and flash security fuse configuration. This is distinct from standard 4-pin JTAG and is specified in the MSP430G2231IPW14R functional block diagram and pinout documentation.

Is the MSP430G2231IPW14R pin-compatible with other devices in the MSP430G2x31 family?

Yes, the MSP430G2231IPW14R shares identical pinout and electrical characteristics with other 14-pin TSSOP variants in the MSP430G2x31 family, including MSP430G2231IPW14 and MSP430G2131IPW14. Differences are limited to flash size (2 kB vs 1 kB) and ADC channel count (8 vs 4), but all share the same PW package footprint, pin functions, and register map - enabling direct substitution where firmware fits.

MSP430G2231IPW14R 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:: 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:: A/D 8x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

MSP430G2231IPW14R FAQ

1.How can I place an order for MSP430G2231IPW14R through Aetrix?

Please submit a Request for Quotation (RFQ) for MSP430G2231IPW14R 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 MSP430G2231IPW14R reliable?

The price and inventory of MSP430G2231IPW14R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430G2231IPW14R is usually 5 days.

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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 MSP430G2231IPW14R?

For technical support, including MSP430G2231IPW14R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430G2231IPW14R requirements.

6.How does Aetrix verify that MSP430G2231IPW14R is sourced from the original manufacturer or authorized distributors?

All MSP430G2231IPW14R 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 MSP430G2231IPW14R meets industry standards.

7.What is the process for return or replacement of MSP430G2231IPW14R?

All MSP430G2231IPW14R units undergo pre-shipment inspection (PSI). If there is an issue with MSP430G2231IPW14R, 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 MSP430G2231IPW14R part is unused and in its original packaging.

Return procedure for MSP430G2231IPW14R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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