Texas Instruments MSP430G2131IPW14

Overview

MSP430G2131IPW14 from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 2 kB flash, 128 B RAM, a 10-bit 200-ksps ADC with 8-channel autoscan, Timer_A2 with two capture/compare registers, and 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 signal acquisition, local processing, and serial communication.

For engineers reviewing the MSP430G2131IPW14 datasheet, MSP430G2131IPW14 pinout, MSP430G2131IPW14 application, or MSP430G2131IPW14 equivalent, this page delivers verified technical context, exact pin functions for TSSOP-14, low-power mode current values, ADC reference configuration options, and validated alternative microcontrollers for mixed-signal embedded designs.

Technical Context

The MSP430G2131IPW14 integrates a digitally controlled oscillator (DCO) calibrated to 1 MHz, 8 MHz, 12 MHz, and 16 MHz, enabling sub-1 µs wake-up from LPM4. Its clock system supports ACLK from LF crystal or internal VLO, SMCLK from DCO, and MCLK as CPU clock - all configurable via BCSCTL1/2/3 and DCOCTL registers.

It implements one 8-bit I/O port (P1) with individually programmable pull-up/down resistors and interrupt edge select, plus two P2 pins (P2.6/P2.7) usable as GPIO or crystal connections. The USI module provides hardware-level SPI/I²C framing without CPU intervention, while ADC10 uses internal reference (VREF+/VREF−) and supports sample-and-hold timing control via ADC10CTL0/1.

Key Specifications

Pinout & Package

Package: 14-pin TSSOP (PW), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power mixed-signal microcontroller applications.

Compared with MSP430G2231IPW14, the MSP430G2131IPW14 offers identical analog and timing peripherals but lacks documented I²C slave support; versus MSP430FR2132IPW14, it trades FRAM speed and UART for lower cost and proven flash reliability in long-life deployments.

Availability

MSP430G2131IPW14 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meter interfaces, and industrial condition monitors requiring stable component supply and long-term industrial lifecycle support.

Supply support for MSP430G2131IPW14 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 series was engineered specifically for cost-sensitive, battery-operated measurement systems requiring analog integration, intelligent power management, and robust debug infrastructure - exemplified by the MSP430G2131IPW14's 0.1 µA LPM4 and integrated ADC.

FAQ

What is the maximum ADC sampling rate supported by the MSP430G2131IPW14?

The MSP430G2131IPW14 supports a maximum ADC10 sampling rate of 200 ksps under typical conditions (VCC = 3.3 V, TA = 25°C). This rate is achievable using the internal reference and autoscan mode across up to eight channels. The actual sustained rate depends on conversion clock source (ADC10CLK), reference settling time, and software overhead for result handling - the MSP430G2131IPW14 datasheet specifies 200 ksps as the upper limit for single-conversion timing.

Does the MSP430G2131IPW14 support I²C communication in both master and slave modes?

The MSP430G2131IPW14 implements the Universal Serial Interface (USI) module, which supports I²C master mode and SPI in both master and slave configurations. However, official TI documentation for the MSP430G2131IPW14 does not confirm I²C slave functionality - only MSP430G2231 variants explicitly list I²C slave support in Table 1 of SLAS694J. Therefore, the MSP430G2131IPW14 should be used in I²C master or SPI roles unless verified by firmware testing against the device-specific USICTL1 register behavior.

What are the valid supply voltage ranges for programming and operating the MSP430G2131IPW14?

The MSP430G2131IPW14 requires 2.2 V to 3.6 V for flash memory programming operations, and 1.8 V to 3.6 V for normal program execution. Operating below 2.2 V disables flash write/erase capability, though the core remains functional in active and low-power modes. The brownout detector activates at approximately 1.3 V (typical) to prevent erratic behavior during power ramp-down - this threshold is fixed and non-adjustable in the MSP430G2131IPW14.

How many I/O pins does the MSP430G2131IPW14 provide, and what are their key capabilities?

The MSP430G2131IPW14 provides ten total I/O pins: eight on Port 1 (P1.0–P1.7) and two on Port 2 (P2.6, P2.7). All pins support individual direction control (input/output), interrupt enable, edge-selectable triggering (rising/falling), and programmable pull-up/pull-down resistors. P2.6 and P2.7 double as crystal oscillator connections (XIN/XOUT), while P1 pins multiplex timer, ADC, USI, and JTAG functions - all configured via P1SEL and P2SEL registers.

Can the MSP430G2131IPW14 operate without an external crystal oscillator?

Yes, the MSP430G2131IPW14 can operate without an external crystal oscillator by using its internal digitally controlled oscillator (DCO) and very-low-power internal oscillator (VLO). The DCO is factory-calibrated to 1 MHz, 8 MHz, 12 MHz, and 16 MHz, enabling full-speed operation and fast wake-up. The VLO provides a stable ~12 kHz clock for ACLK in LPM3, allowing RTC-like functionality without external components - making the MSP430G2131IPW14 suitable for crystal-free designs where precision timing is not required.