Texas Instruments MSP430F5131IRSBR

Overview

MSP430F5131IRSBR from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller 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 in a 40-pin QFN package. It operates from 1.8 V to 3.6 V and supports wake-up from LPM3 in <5 µs - ideal for battery-powered sensor nodes and remote controls.

For engineers reviewing the MSP430F5131IRSBR datasheet, MSP430F5131IRSBR pinout, MSP430F5131IRSBR application, or MSP430F5131IRSBR equivalent, key selection criteria include its 8 KB Flash/1 KB RAM configuration, absence of integrated ADC (unlike F51x2 variants), 40-pin RSB package pin compatibility across the F51x1 family, and support for low-power timing-critical functions via Timer_D high-resolution mode.

Technical Context

The MSP430F5131IRSBR implements the CPUXV2 core with constant generators and 40-ns instruction cycle time, paired with a unified clock system including DCO, REFO, VLO, and XT1 support (32 kHz to 25 MHz). Its power management integrates an on-chip LDO with programmable core voltage and brownout detection.

It features a reconfigurable port mapping controller enabling flexible peripheral assignment to I/O pins, three-channel DMA for autonomous data movement, and hardware multiplier supporting 32-bit operations - all optimized for deterministic real-time response in energy-constrained embedded systems.

Key Specifications

Pinout & Package

Package: 40-pin WQFN (RSB), 5 mm × 5 mm, 0.4-mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F5151IRSBR and MSP430F5132IRSBR, the MSP430F5131IRSBR offers optimal cost/power balance for purely digital control tasks - trading ADC capability and memory headroom for lower unit cost and minimal power overhead in I/O- and timer-centric designs.

Availability

MSP430F5131IRSBR is available at Aetrix Electronics and suitable for wireless sensor nodes, smart thermostat interfaces, industrial remote controls, digital power supply monitors, and LED lighting controllers requiring stable component supply and long-term manufacturability.

Supply support for MSP430F5131IRSBR 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 reliability.

The MSP430F51x1 product line targets ultra-low-power portable measurement and control applications - designed to maximize battery life through intelligent power gating, fast wake-up, and integrated peripherals that minimize external component count.

FAQ

Does the MSP430F5131IRSBR include an integrated analog-to-digital converter (ADC)?

No, the MSP430F5131IRSBR does not include an ADC. It belongs to the F51x1 subfamily, which omits the ADC10_A module present in F51x2 variants (e.g., MSP430F5132). Analog sensing requires external ADC or selection of an F51x2 part. The MSP430F5131IRSBR retains all other peripherals - including Timer_D, USCI, comparator, and DMA - making it ideal for digital-control-focused designs where ADC is unnecessary.

What is the package type and pin count of the MSP430F5131IRSBR?

The MSP430F5131IRSBR uses a 40-pin WQFN package (orderable code RSB), measuring 5 mm × 5 mm with 0.4-mm pitch and an exposed thermal pad. This matches the pinout of other F51x1/F51x2 devices in the RSB variant, enabling hardware reuse across memory/peripheral variants. Pin assignments are documented in Section 4.1 of the SLAS619R datasheet.

Can the MSP430F5131IRSBR operate from a single 3.3-V supply?

Yes, the MSP430F5131IRSBR operates across 1.8 V to 3.6 V, fully supporting standard 3.3-V systems. Its internal LDO regulates VCORE to 1.8 V–2.2 V regardless of input, ensuring consistent core performance. DVIO may be tied to 3.3 V to enable 5-V-tolerant I/O operation with 3.3-V logic levels - critical for interfacing with mixed-voltage peripherals.

How does the port mapping controller function on the MSP430F5131IRSBR?

The port mapping controller on the MSP430F5131IRSBR allows runtime assignment of secondary peripheral functions (e.g., USCI_A0 TXD, TD0.0, CB0) to any GPIO pin within designated port groups. Configuration is done via PMAPCTL and port-specific PMAP registers. This eliminates fixed-function pin constraints - enabling flexible PCB layout and firmware-driven peripheral reassignment without hardware modification.

What debug interface does the MSP430F5131IRSBR support?

The MSP430F5131IRSBR supports Spy-Bi-Wire (SBW) debugging using the RST/NMI/SBWTDIO and TEST/SBWTCK pins - a 2-wire subset of JTAG requiring only two PCB traces. It enables full flash programming, breakpoint setting, and register inspection via TI's MSP-FET or compatible tools. No external voltage is needed; SBW operates natively from the device's DVCC supply.