Texas Instruments MSP430G2131IRSA16T

Overview

MSP430G2131IRSA16T from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 2 kB flash, 128 B RAM, a 10-bit 200-ksps ADC with internal reference and autoscan, Timer_A with two capture/compare registers, and USI supporting SPI/I²C. It operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes requiring precise analog acquisition and low-energy wireless telemetry.

For engineers reviewing the MSP430G2131IRSA16T datasheet, MSP430G2131IRSA16T pinout, MSP430G2131IRSA16T application, or MSP430G2131IRSA16T equivalent, this page delivers verified functional identity, QFN-16 package mapping, confirmed ADC10/USI/Timers peripheral set, low-power mode timing behavior, and two validated alternative parts for design continuity.

Technical Context

The MSP430G2131IRSA16T implements a 16-bit CPU with constant generators and seven addressing modes, executing register-to-register instructions in one MCLK cycle. Its clock system integrates a digitally controlled oscillator (DCO) calibrated to 1 MHz, LF oscillator, and 32-kHz crystal support - enabling sub-1 µs wake-up from LPM4.

Peripherals include a 10-bit SAR ADC with sample-and-hold, internal VREF+/VREF−, and eight selectable analog inputs; USI module configurable for synchronous SPI or I²C; and Timer_A2 with dual capture/compare channels supporting PWM, interval timing, and input capture. All I/O pins support individually programmable pull-up/down resistors and edge-selectable interrupts.

Key Specifications

Pinout & Package

Package: 16-pin QFN (RSA), 3 mm × 3 mm, 0.5 mm pitch, exposed thermal pad connected to DVSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2131IRSA16T, MSP430G2231IRSA16 offers expanded ADC channel count while maintaining pin and code compatibility, whereas MSP430G2131IPW14 provides identical functionality in a through-hole-compatible package - both enable seamless migration paths without firmware or schematic revision.

Availability

MSP430G2131IRSA16T is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart meter endpoints, and industrial condition monitors requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MSP430G2131IRSA16T 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 family was designed specifically for cost-sensitive, battery-operated measurement systems requiring high analog integration, minimal power consumption, and robust firmware security - exemplified by the MSP430G2131IRSA16T's ADC10, USI, and Spy-Bi-Wire features.

FAQ

What is the maximum operating frequency of the MSP430G2131IRSA16T?

The MSP430G2131IRSA16T 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 DCO oscillator; external crystal or digital clock sources may also drive MCLK, SMCLK, or ACLK depending on configuration. The MSP430G2131IRSA16T does not require external components to achieve full-speed operation.

Does the MSP430G2131IRSA16T include an analog-to-digital converter?

Yes, the MSP430G2131IRSA16T integrates a 10-bit successive-approximation ADC (ADC10) with 200 ksps sampling rate, internal reference generator (VREF+/VREF−), sample-and-hold circuitry, and autoscan capability across eight analog inputs (A0–A7). This ADC is confirmed in Table 1 and functional block diagrams of the SLAS694J datasheet for the G2x31 series.

What debug interface does the MSP430G2131IRSA16T support?

The MSP430G2131IRSA16T supports the Spy-Bi-Wire (SBW) interface using two dedicated pins: RST/NMI/SBWTDIO (Pin 9) and TEST/SBWTCK (Pin 10). This 2-wire interface enables full-speed debugging, flash programming, and fuse configuration without requiring a full 4-wire JTAG header, reducing PCB footprint and test fixture complexity.

What low-power modes are available on the MSP430G2131IRSA16T?

The MSP430G2131IRSA16T provides five software-selectable low-power modes: LPM0 through LPM4. LPM4 draws just 0.1 µA with RAM retention and is exited in under 1 µs via interrupt. LPM3 consumes 0.5–1.5 µA depending on clock source (LFXT1 or VLO), making it ideal for real-time clock applications. All modes are documented in Section 7 of SLAS694J.

Is the MSP430G2131IRSA16T pin-compatible with other devices in the G2x31 family?

Yes, the MSP430G2131IRSA16T shares identical pinout and electrical characteristics with other RSA-package G2x31 variants including MSP430G2231IRSA16. Pin functions for P1.0–P1.7, P2.6/P2.7, RST/NMI/SBWTDIO, TEST/SBWTCK, DVCC, and DVSS are fully aligned per Table 2 and device pinout diagrams in SLAS694J, enabling drop-in replacement within the same package family.