Texas Instruments MSP430F2131TDWR

Overview

MSP430F2131TDWR 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, enabling battery-powered sensor node applications requiring long-term autonomous operation.

For engineers reviewing the MSP430F2131TDWR datasheet, MSP430F2131TDWR pinout, MSP430F2131TDWR application, or MSP430F2131TDWR equivalent, key selection criteria include its -40°C to 105°C extended temperature rating, TSSOP-20 package, integrated DCO with four factory-calibrated frequencies (1/8/12/16 MHz), and JTAG-compatible on-chip emulation module for low-overhead debugging.

Technical Context

The MSP430F2131TDWR implements a 16-bit RISC CPU with constant generators and seven addressing modes, achieving 62.5-ns instruction cycle time. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and high-frequency crystal input up to 16 MHz - all configurable via BCSCTL registers.

Power management is handled through six operating modes (AM, LPM0–LPM4), with sub-1-μs wake-up from standby and ultra-low off-mode current (0.1 μA with RAM retention). The analog comparator supports eight-channel input multiplexing (CA0–CA7) and direct interface to Timer_A for slope-based A/D conversion without external components.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), body width 4.4 mm, lead pitch 0.65 mm, RoHS-compliant, thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F2131TDWR, the MSP430F2132IPW adds integrated ADC functionality at the expense of extended temperature rating, while the MSP430G2553IPW provides greater memory and ADC resolution but lacks factory-trimmed DCO stability - making MSP430F2131TDWR optimal for extended-temp, crystal-free, ultra-low-power sensing where slope ADC suffices.

Availability

MSP430F2131TDWR is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor nodes, portable medical devices, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MSP430F2131TDWR 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 MSP430F2131TDWR belongs to the MSP430x2xx ultra-low-power MCU family, engineered specifically for battery-operated measurement systems where energy efficiency, analog integration, and robust operation across harsh environments are primary design requirements.

FAQ

What is the maximum operating frequency of the MSP430F2131TDWR?

The MSP430F2131TDWR supports a maximum system clock (MCLK) frequency of 16 MHz when VCC ≥ 3.3 V and duty cycle is 50% ±10%. This is achieved using the factory-calibrated internal DCO, eliminating the need for an external high-frequency crystal. At lower supply voltages, the maximum frequency is reduced: 12 MHz at 2.7 V and 6 MHz at 1.8 V. All timing specifications assume proper configuration of BCSCTL1 and DCOCTL registers using the calibration constants stored in Info Segment A.

Does the MSP430F2131TDWR include a hardware ADC?

No, the MSP430F2131TDWR does not include a dedicated successive-approximation or sigma-delta ADC. Instead, it features an analog comparator (Comparator_A+) with eight input channels (CA0–CA7) and slope A/D conversion capability - where the comparator output drives Timer_A to measure input voltage by timing capacitor charge/discharge cycles. This architecture achieves effective 10–12 bit resolution with minimal external components, as confirmed in the SLAS439F datasheet section "Comparator_A+" and "Timer_A3".

What package type and pin count does the MSP430F2131TDWR use?

The MSP430F2131TDWR uses a 20-pin Plastic Thin Shrink Small-Outline Package (TSSOP), designated as PW in TI's packaging nomenclature. It measures 6.5 mm × 4.4 mm with 0.65 mm lead pitch and is RoHS-compliant. This package is distinct from the DW (SOWB), DGV (TVSOP), and RGE (QFN) variants listed in Table 1 of SLAS439F - all sharing identical electrical functionality but differing in mechanical form factor and thermal characteristics.

How is flash memory programmed on the MSP430F2131TDWR?

Flash memory on the MSP430F2131TDWR can be programmed via three methods: (1) JTAG interface using tools like MSP-FET430UIF, (2) UART-based Bootstrap Loader (BSL) using P1.1 (TX) and P2.2 (RX) pins, or (3) in-system programming by the CPU itself. The BSL is protected by a user-defined password and can be disabled permanently using the 0xAA55 security key written to address 0xFFDE. Flash segments are 512 bytes each, and segment A contains factory calibration data that must be preserved unless explicitly unlocked.

What is the purpose of the TEST pin on the MSP430F2131TDWR?

The TEST pin (Pin 1) on the MSP430F2131TDWR enables JTAG test mode when pulled high during power-up. It connects directly to the internal JTAG fuse and is used during device programming and boundary-scan testing. TI documentation confirms this pin controls access to the JTAG interface and is tied to the security fuse - improper handling (e.g., floating or incorrect voltage) may prevent debugging or programming. It must be driven externally per SLAS439F Section "Device Pinout" and "JTAG Interface".