Texas Instruments MSP430F2131IRGET

Overview

MSP430F2131IRGET from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 8 KB + 256 B flash memory, 256 B RAM, a 16-bit Timer_A with three capture/compare registers, and an on-chip analog comparator for slope A/D conversion. It operates from 1.8 V to 3.6 V and supports active-mode current of 250 μA at 1 MHz/2.2 V - ideal for battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F2131IRGET datasheet, MSP430F2131IRGET pinout, MSP430F2131IRGET application, or MSP430F2131IRGET equivalent, key selection criteria include its QFN-24 package, -40°C to 85°C temperature grade, integrated DCO with four factory-calibrated frequencies (1/8/12/16 MHz), brownout detection, and JTAG/on-chip emulation support for low-overhead debugging.

Technical Context

The MSP430F2131IRGET implements a 16-bit RISC 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 high-frequency crystal support up to 16 MHz - all configurable via BCSCTL registers.

Power management is centered on six operating modes (AM, LPM0–LPM4), with sub-1 μs wake-up from standby and ultra-low LPM4 current (0.1 μA). The analog comparator feeds into Timer_A for slope-based A/D conversion, while dual 8-bit I/O ports (P1/P2) provide interrupt-capable pins with individually programmable pullup/pulldown resistors and edge-selectable triggers.

Key Specifications

Pinout & Package

Package: 24-pin QFN (RGE), 4 mm × 4 mm, 0.5 mm pitch, with exposed thermal pad connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F2121IRGET, the MSP430F2131IRGET provides double flash capacity for field-upgradable firmware and richer calibration data storage; versus MSP430G2553IPW28, it trades serial peripheral integration for smaller footprint and lower active current in pure sensing roles.

Availability

MSP430F2131IRGET is available at Aetrix Electronics and suitable for environmental monitoring, battery-powered medical devices, and industrial condition-sensing applications requiring stable component supply across extended product lifecycles.

Supply support for MSP430F2131IRGET 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 delivering analog, embedded processing, and connectivity solutions with emphasis on energy efficiency and system-level integration.

The MSP430F2131IRGET belongs to the MSP430x21x1 ultra-low-power microcontroller family, designed specifically for battery-operated sensor acquisition, portable instrumentation, and energy-harvesting endpoints where nanowatt-scale sleep and microsecond wake-up are essential.

FAQ

What is the maximum operating frequency of the MSP430F2131IRGET?

The MSP430F2131IRGET supports a maximum MCLK frequency of 16 MHz when VCC ≥3.3 V and duty cycle is 50% ±10%. This is achieved using the internal digitally controlled oscillator (DCO) with factory-calibrated settings stored in flash segment A. The DCO delivers ±1% accuracy at 16 MHz, eliminating the need for an external high-frequency crystal in many timing-critical applications while maintaining ultra-low power consumption.

Does the MSP430F2131IRGET support hardware UART or SPI interfaces?

No, the MSP430F2131IRGET does not include dedicated hardware UART, SPI, or I²C modules. Communication must be implemented via bit-banged GPIO or through Timer_A capture/compare functions for basic synchronous protocols. For designs requiring hardware serial interfaces, TI recommends the MSP430G2553IPW28 or later MSP430FRxx series, which integrate USCI modules. The MSP430F2131IRGET prioritizes minimal die size and lowest possible active/sleep current over peripheral richness.

How is flash memory protected against unauthorized access on the MSP430F2131IRGET?

Flash protection on the MSP430F2131IRGET is enforced via a security fuse that disables JTAG access when blown. Additionally, the bootstrap loader (BSL) includes password-based access control: a user-defined 32-byte password guards flash erase/write operations, and a security key at address 0xFFDE (0xAA55 disables BSL entirely, 0x0000 disables flash erasure on invalid password). These mechanisms prevent reverse engineering and firmware cloning in deployed devices.

Can the MSP430F2131IRGET operate from a single 1.8 V supply during flash programming?

No. Flash programming on the MSP430F2131IRGET requires a minimum VCC of 2.2 V, as specified in the Recommended Operating Conditions table. Attempting to program flash at 1.8 V will result in verification failure or incomplete writes. During normal program execution, however, the device fully supports the 1.8 V to 3.6 V range - making it suitable for deep-sleep operation on low-voltage energy harvesters or aging batteries, with brief wake-up to a higher rail or charge-pump circuit for firmware updates.

What is the function of the exposed thermal pad on the MSP430F2131IRGET QFN package?

The exposed thermal pad on the MSP430F2131IRGET (RGE package) is electrically connected to VSS and must be soldered to a PCB copper pour tied to the system ground plane. This connection improves thermal dissipation during sustained active-mode operation and enhances electrical stability by lowering ground impedance. TI documentation explicitly recommends connecting the pad to VSS - it is not optional or floating. Failure to do so may cause elevated junction temperature and marginal timing behavior under continuous 16 MHz operation.