Texas Instruments MSP430FR2673TRHBR

Overview

MSP430FR2673TRHBR from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller with integrated CapTIvate™ capacitive touch sensing, 16KB FRAM + 512B information FRAM, 4KB RAM, and 27 GPIOs in a 32-pin VQFN (RHB) package. It supports up to 16 self-capacitive and 64 mutual-capacitive electrodes, operates from 1.8 V to 3.6 V, and delivers <0.9 µA/button wake-on-touch current for battery-powered smart locks and appliance control panels.

For engineers reviewing the MSP430FR2673TRHBR datasheet, MSP430FR2673TRHBR pinout, MSP430FR2673TRHBR application, or MSP430FR2673TRHBR equivalent, key selection criteria include its 32-pin VQFN footprint, hardware-accelerated touch state machine, FRAM endurance (10¹⁵ cycles), IEC-61000-4-2/4-4/4-6 compliance, and support for metal/water-rejecting touch interfaces in harsh environments.

Technical Context

The MSP430FR2673TRHBR implements a dedicated CapTIvate module with autonomous electrode scanning-enabling four simultaneous scans and high-resolution sliders (up to 1024 points)-while the CPU remains in LPM4.5 (37 nA). Its 16-bit RISC core runs at up to 16 MHz via DCO+FLL, with ±1% accuracy at room temperature using on-chip reference.

Capacitive sensing is performed using configurable self- and mutual-capacitance channels across 16 dedicated CAPx pins, supported by hardware spread spectrum, automatic tuning, and noise filtering algorithms that achieve 10-V RMS common-mode noise immunity and 15-kV ESD robustness without external shielding.

Key Specifications

Pinout & Package

Package: 32-pin VQFN (RHB), 5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR2675TRHB and MSP430FR2672TRHB, the MSP430FR2673TRHBR provides optimal balance of memory (16KB FRAM), electrode scalability (64 mutual-cap), and ultra-low-power touch performance in the 32-pin RHB package-making it ideal for mid-tier consumer HMI where BOM cost and feature depth must coexist.

Availability

MSP430FR2673TRHBR is available at Aetrix Electronics and suitable for smart lock keypads, white goods control panels, and garage door systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MSP430FR2673TRHBR 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 company delivering analog and embedded processing solutions with leadership in low-power design, precision analog integration, and broad development ecosystem support.

The MSP430FR267x product line is engineered specifically for ultra-low-power capacitive touch human-machine interfaces, combining autonomous sensing hardware, FRAM nonvolatility, and robust EMC performance for industrial and consumer appliances.

FAQ

What is the maximum number of mutual-capacitive electrodes supported by the MSP430FR2673TRHBR?

The MSP430FR2673TRHBR supports up to 64 mutual-capacitive electrodes, as confirmed in the device comparison table and CapTIvate feature description. This capability is enabled by its dedicated CapTIvate module and 27 GPIOs configured across four CAPx port groups (CAP0–CAP3), allowing flexible layout of sliders, wheels, and matrix keypads without external ICs. The MSP430FR2673TRHBR achieves this while maintaining full compatibility with TI's CapTIvate Design Center GUI and ROM-based touch library.

Does the MSP430FR2673TRHBR include hardware support for wake-on-touch functionality?

Yes, the MSP430FR2673TRHBR includes a dedicated hardware state machine for wake-on-touch that operates independently of the CPU. In standby mode (LPM3), it performs full electrode scanning, noise filtering, and threshold detection at <5 µA total current with four active sensors. The CPU remains fully asleep until a valid touch event triggers an interrupt, enabling battery lifetimes exceeding five years on a single CR2032 cell. This autonomous operation is intrinsic to the CapTIvate peripheral and requires no software polling.

What package type and pin count does the MSP430FR2673TRHBR use?

The MSP430FR2673TRHBR uses a 32-pin VQFN package with RHB suffix, measuring 5 mm × 5 mm with 0.5 mm pitch and an exposed thermal pad. This package is shared across the MSP430FR2672/73/75/76 RHB variants and provides 27 GPIOs-including 16 dedicated CapTIvate electrode pins-while maintaining pin-to-pin compatibility within the RHB family. Pin functions are documented in Figure 7-3 of the SLASEO5D datasheet.

How does the MSP430FR2673TRHBR handle electromagnetic interference in noisy environments?

The MSP430FR2673TRHBR achieves robust EMC performance through integrated hardware features: built-in spread spectrum modulation, automatic electrode tuning, adaptive noise filtering, and hardware debouncing. These enable reliable operation under 10-V RMS common-mode noise and compliance with IEC-61000-4-2 (15-kV contact ESD), -4-4 (4-kV EFT), and -4-6 (RF immunity) standards-without requiring external shielding, guard traces, or ferrites. Its CapTIvate engine processes signals digitally in real time, rejecting transient coupling before it reaches the application layer.

Is FRAM memory on the MSP430FR2673TRHBR protected against unintended writes?

Yes, the MSP430FR2673TRHBR includes configurable FRAM write protection implemented via the SYSCTL register set. Protection can be applied to program FRAM, information FRAM, or both-enabling secure storage of calibration data, encryption keys, or bootloader code. Each protected segment enforces hardware-enforced read-only access until explicitly unlocked via privileged software sequence. Additionally, built-in ECC detects and corrects single-bit errors, ensuring data integrity across the full 10¹⁵ write-cycle endurance rating of the FRAM array.