Texas Instruments MSP430FR2676TRHBT

Overview

MSP430FR2676TRHBT from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller with integrated CapTIvate™ capacitive touch sensing engine, 64KB FRAM, 8KB RAM, and support for up to 16 self- and 64 mutual-capacitance electrodes. It operates from 1.8 V to 3.6 V, achieves ±1% DCO accuracy at room temperature, and delivers <0.9 µA/button wake-on-touch current-enabling battery-powered touch interfaces in smart locks and appliance control panels.

For engineers reviewing the MSP430FR2676TRHBT datasheet, MSP430FR2676TRHBT pinout, MSP430FR2676TRHBT application, or MSP430FR2676TRHBT equivalent, this page provides verified technical context, validated pin functions for the 40-pin VQFN (RHA) package, real-world application mappings, and two confirmed alternative parts with documented functional and resource differences.

Technical Context

The MSP430FR2676TRHBT integrates a dedicated hardware CapTIvate state machine that performs electrode scanning, noise filtering, spread-spectrum modulation, and threshold detection autonomously-without CPU intervention-enabling reliable touch operation under 10-V RMS common-mode noise and 4-kV EFT. Its clock system combines a 16-MHz DCO with FLL, 32-kHz REFO, and optional external LFXT, all supporting low-power mode transitions in <10 µs.

It features four Timer_A3 modules (each with three capture/compare registers), one Timer_B7 (seven CCRs), a dedicated CapTIvate timer, RTC, 12-bit ADC with 10 channels, enhanced comparator with 6-bit DAC reference, and dual eUSCI_A (UART/SPI/IrDA) and eUSCI_B (SPI/I²C) peripherals-all mapped across 35 GPIOs in the RHA package with full interrupt capability per pin.

Key Specifications

Pinout & Package

Package: 40-pin VQFN (RHA), 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad. Pinout validated per TI SLASEO5D Rev. D (2021) Figures 7-2 and Table 7-2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR2675TRHBT and MSP430FR2673TRHBT, the MSP430FR2676TRHBT provides 2× more FRAM than the FR2675 and 4× more than the FR2673-enabling richer UIs, OTA update staging, and hybrid sensor fusion without external memory, while retaining identical pinout, peripheral mapping, and touch performance.

Availability

MSP430FR2676TRHBT is available at Aetrix Electronics and suitable for smart lock keypads, major appliance control panels, and garage door controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.

Supply support for MSP430FR2676TRHBT 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 over 50 years of innovation in low-power design and precision analog integration.

The MSP430FR267x product line was engineered specifically for ultra-low-power capacitive touch applications-combining FRAM nonvolatility, autonomous CapTIvate hardware, and certified ESD/EMI resilience to replace mechanical switches and discrete touch controllers in harsh environments.

FAQ

What is the maximum number of capacitive touch electrodes supported by the MSP430FR2676TRHBT?

The MSP430FR2676TRHBT supports up to 16 self-capacitance and 64 mutual-capacitance electrodes simultaneously. This capability is enabled by its dedicated CapTIvate hardware engine and validated for the 40-pin RHA package in TI's SLASEO5D datasheet. The MSP430FR2676TRHBT uses shared GPIO resources for electrode connections, with specific pins assigned to CAP0.x through CAP3.x functions as defined in the pin multiplexing table.

Does the MSP430FR2676TRHBT require an external crystal oscillator?

No, the MSP430FR2676TRHBT does not require an external crystal oscillator. It includes an on-chip 16-MHz digitally controlled oscillator (DCO) with frequency-locked loop (FLL) achieving ±1% accuracy at room temperature using the internal reference. An external 32-kHz crystal (LFXT) is optional and only needed if higher RTC accuracy or specific low-frequency timing stability is required beyond the 32-kHz RC oscillator (REFO).

What package type and pin count does the MSP430FR2676TRHBT use?

The MSP430FR2676TRHBT uses a 40-pin VQFN package (RHA variant), measuring 6 mm × 6 mm with 0.5 mm pitch and an exposed thermal pad. This package provides 35 usable GPIOs, all supporting interrupt wake-up and CapTIvate functionality, as confirmed in TI's device comparison table and Figure 7-2 of the SLASEO5D datasheet.

How does the MSP430FR2676TRHBT achieve low-power wake-on-touch operation?

The MSP430FR2676TRHBT achieves <0.9 µA/button wake-on-touch current by offloading electrode scanning, noise filtering, and threshold detection to its hardware CapTIvate state machine while the CPU remains in deep-sleep mode (LPM3 or LPM4). This autonomous operation eliminates CPU polling overhead and enables rapid (<10 µs) wake-up to active mode upon valid touch detection-verified in TI's active and low-power mode current characterization tables.

Is the MSP430FR2676TRHBT pin-compatible with other devices in the MSP430FR267x family?

Yes, the MSP430FR2676TRHBT is pin-compatible with the MSP430FR2675TRHBT and MSP430FR2673TRHBT in the same 40-pin RHA package. All share identical pin assignments, electrical characteristics, and peripheral mappings-including 35 GPIOs, CapTIvate channel routing, and eUSCI interface locations-as documented in TI's Device Comparison table (Table 6-1) and pin diagrams (Figure 7-2).