Texas Instruments MSP430F5131IDA

Overview

MSP430F5131IDA from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller in a 38-pin TSSOP package, featuring 8 KB Flash, 1 KB RAM, dual 16-bit Timer_D modules (TD0/TD1), USCI_A0 (UART/IrDA/SPI) and USCI_B0 (I²C/SPI), 16-channel comparator, and 5-V-tolerant I/Os with up to 20-mA drive strength. It targets battery-powered sensor systems and digital power supplies requiring sub-1-µA standby current.

For engineers reviewing the MSP430F5131IDA datasheet, MSP430F5131IDA pinout, MSP430F5131IDA application, or MSP430F5131IDA equivalent, key selection factors include its LPM3 standby current (1.1 µA @ 3 V), 32-bit hardware multiplier, reconfigurable port mapping, 40-ns instruction cycle time, and support for 32-kHz crystal (XT1) and high-frequency crystals up to 25 MHz.

Technical Context

The MSP430F5131IDA implements a unified clock system with FLL stabilization, VLO (10 kHz), REFO (32.768 kHz), and XT1 oscillator support - enabling precise timing across low-power modes. Its CPUXV2 core integrates constant generators and 16-bit registers for optimized code density and wake-up latency under 5 µs from LPM3.

Power management includes an integrated LDO with programmable core voltage, supply supervision (SVM/SVS), and brownout reset. Peripheral control is centralized via the Port Mapping Controller, allowing dynamic remapping of USCI, Timer, and ADC functions to multiple pins without hardware changes.

Key Specifications

Pinout & Package

Package: 38-pin TSSOP (DA), body size 12.5 mm × 6.2 mm, lead pitch 0.65 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F5151IDA and MSP430F5171IDA, the MSP430F5131IDA provides identical ultra-low-power operation, timer and communication capabilities, and 5-V-tolerant I/O in the same 38-pin TSSOP package - but omits the ADC to reduce cost and power for applications relying solely on comparator-based thresholds and digital interfaces.

Availability

MSP430F5131IDA is available at Aetrix Electronics and suitable for LED lighting control, digital power supply monitoring, and thermostat sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MSP430F5131IDA 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 MSP430F51x1 product line delivers optimized mixed-signal microcontrollers for portable measurement, battery-operated sensing, and energy-constrained industrial control - emphasizing sub-µA standby, fast wake-up, and peripheral flexibility without ADC overhead.

FAQ

What is the maximum operating frequency of the MSP430F5131IDA?

The MSP430F5131IDA supports a maximum MCLK frequency of 25 MHz using an external high-frequency crystal (XT1). Its DCO can be calibrated to achieve stable operation across the full 1.8–3.6 V supply range, with FLL stabilization ensuring frequency accuracy within ±1% over temperature and voltage variations. The MSP430F5131IDA's 40-ns instruction cycle enables deterministic execution at this rate.

Does the MSP430F5131IDA include an analog-to-digital converter (ADC)?

No, the MSP430F5131IDA does not include an ADC. It belongs to the MSP430F51x1 family, which omits the ADC10_A module present in the F51x2 variants (e.g., MSP430F5132). Instead, it features a 16-channel comparator_B with ultra-low-power mode - intended for threshold detection, window monitoring, and zero-crossing applications where digitized voltage levels are unnecessary.

What debug interface does the MSP430F5131IDA support?

The MSP430F5131IDA supports the two-wire Spy-Bi-Wire (SBW) interface via RST/NMI/SBWTDIO and TEST/SBWTCK pins. This enables full in-system programming, real-time debugging, and flash memory erase/write operations using standard TI tools like MSP-FET or LaunchPad development kits - without requiring a 4-wire JTAG header or external voltage programming.

Can the MSP430F5131IDA operate from a 3.3-V supply while driving 5-V logic?

Yes. The MSP430F5131IDA features 5-V-tolerant I/Os on designated pins (up to 12), powered by the separate DVIO rail. When DVIO is connected to 5 V and DVCC to 3.3 V, those pins safely interface with 5-V CMOS or TTL logic without external level shifters - enabling direct connection to legacy peripherals, optocouplers, or LED drivers while maintaining low core power consumption.

How many I/O pins does the MSP430F5131IDA have, and are they all reconfigurable?

The MSP430F5131IDA provides up to 29 general-purpose I/O pins across ports P1, P2, P3, and PJ in its 38-pin TSSOP package. All 29 pins support reconfigurable secondary functions (e.g., USCI, Timer_D, comparator inputs) via the Port Mapping Controller - allowing runtime assignment of peripherals to different pins, which simplifies PCB layout and supports feature differentiation across product variants using the same hardware.