Texas Instruments MSP430F2131IPW

Overview

MSP430F2131IPW from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 8 KB flash memory, 256 B RAM, integrated 16-bit Timer_A with three capture/compare registers, on-chip analog comparator for slope A/D conversion, and programmable DCO clock up to 16 MHz. It operates from 1.8 V to 3.6 V and targets battery-powered sensor systems requiring sub-1-μs wake-up and long-term energy efficiency.

For engineers reviewing the MSP430F2131IPW datasheet, MSP430F2131IPW pinout, MSP430F2131IPW application, or MSP430F2131IPW equivalent, key selection criteria include active-mode current at 1 MHz (250 μA @ 2.2 V), LPM4 standby current (0.1 μA), TSSOP-20 package compatibility, and JTAG/BSL programming support - all critical for portable measurement and RF front-end designs.

Technical Context

The MSP430F2131IPW implements a 16-bit CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal input (XIN/XOUT), and selectable high-frequency crystal support - all calibrated to ±1% across four factory-set frequencies (1/8/12/16 MHz).

Power management is governed by six software-selectable operating modes (AM, LPM0–LPM4), with hardware-assisted ultra-fast wake-up (<1 μs) from LPM3/LPM4. The analog comparator supports both dedicated analog signal monitoring and slope-based A/D conversion without external components, directly interfacing with Timer_A for timing-critical threshold detection.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), body width 4.4 mm, pitch 0.65 mm, JEDEC MO-153 compliant. Thermal pad not present - no exposed pad connection required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F2121IPW and MSP430G2553IPW28, the MSP430F2131IPW delivers optimal balance of flash capacity (8 KB), ultra-low standby current (0.1 μA), and TSSOP-20 footprint - making it ideal for space-constrained, long-life sensor nodes where firmware growth headroom and minimal quiescent power are jointly critical.

Availability

MSP430F2131IPW is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, and smart meter interface modules requiring stable component supply and long-term manufacturability.

Supply support for MSP430F2131IPW 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 90 years of innovation in low-power design.

The MSP430F2131IPW belongs to the MSP430x2xx ultra-low-power microcontroller family, engineered specifically for portable measurement and battery-operated sensing applications demanding nanowatt-level standby power and rapid wake-up responsiveness.

FAQ

What is the maximum operating frequency of the MSP430F2131IPW?

The MSP430F2131IPW supports a maximum system clock (MCLK) frequency of 16 MHz when supplied at ≥3.3 V, enabled by its factory-calibrated digitally controlled oscillator (DCO). At lower supply voltages (e.g., 2.2 V), the maximum supported frequency is reduced to 6 MHz per TI's recommended operating conditions. This frequency scaling ensures stable operation across the full 1.8–3.6 V supply range while maintaining ultra-low power consumption.

Does the MSP430F2131IPW support in-system programming without a JTAG debugger?

Yes, the MSP430F2131IPW includes a built-in bootstrap loader (BSL) that enables in-system programming via UART using pins P1.1 (TX) and P2.2 (RX). No external JTAG debugger is required for field firmware updates, provided the BSL security key is properly configured. The BSL is protected by a user-defined password and can be disabled entirely using the 0xAA55 key stored at address 0xFFDE.

What are the key differences between the MSP430F2131IPW and MSP430F2131IDW packages?

The MSP430F2131IPW uses a 20-pin TSSOP (thin shrink small-outline package) with 0.65 mm pitch, while the MSP430F2131IDW uses a 20-pin SOWB (small-outline wide body) package with 1.27 mm pitch. Both share identical electrical specifications and pin functions, but the TSSOP offers higher component density and is preferred for compact PCB layouts. The SOWB variant simplifies hand-soldering and prototyping due to its wider lead spacing.

Can the MSP430F2131IPW operate from a single 1.8 V supply without external regulators?

Yes, the MSP430F2131IPW is fully specified to operate across 1.8 V to 3.6 V, including flash programming (minimum 2.2 V) and active execution. Its internal voltage regulator and brownout detector (BOR) ensure reliable operation down to 1.8 V, eliminating the need for external LDOs in single-cell battery applications such as coin-cell-powered sensors or wearable devices.

How does the analog comparator in the MSP430F2131IPW support slope A/D conversion?

The MSP430F2131IPW's comparator_A+ module performs slope A/D conversion by comparing a slowly ramping internal voltage (generated via Timer_A-controlled DAC-like charging of a capacitor) against the input analog signal. When the ramp crosses the signal threshold, the comparator output triggers a Timer_A capture event - converting time-to-cross into digital value. This technique eliminates external ADC components while maintaining 10–12 bit effective resolution depending on ramp stability and noise.