Texas Instruments MSP430FR2533IRHBT

Overview

MSP430FR2533IRHBT from Texas Instruments is an ultra-low-power mixed-signal microcontroller with integrated CapTIvate™ capacitive touch sensing technology, 15.5 KB FRAM, 2 KB RAM, and support for up to 16 self-capacitive or 24 mutual-capacitive electrodes. It operates from 1.8 V to 3.6 V, achieves 126 µA/MHz active current, and delivers <5 µA wake-on-touch power in LPM3.5 - enabling robust touch interfaces in battery-powered smart locks and appliance control panels.

For engineers reviewing the MSP430FR2533IRHBT datasheet, MSP430FR2533IRHBT pinout, MSP430FR2533IRHBT application, or MSP430FR2533IRHBT equivalent, key selection criteria include its 32-pin VQFN (RHB) package, dedicated CapTIvate timing engine, hardware-accelerated noise filtering, and compatibility with TI's CapTIvate Design Center GUI for real-time electrode tuning without firmware changes.

Technical Context

The MSP430FR2533IRHBT integrates a 16-bit RISC CPU running at up to 16 MHz, paired with a dedicated CapTIvate peripheral that performs autonomous electrode scanning using spread spectrum modulation, automatic tuning, and built-in debouncing - all while the CPU remains in LPM3.5 sleep mode. Its clock system includes on-chip DCO (±1% accuracy), REFO, VLO, and LFXT support for precise timing across operating modes.

Capacitive sensing is implemented via configurable charge-transfer measurement across up to 16 self-capacitance or 24 mutual-capacitance channels, with hardware support for proximity detection, water rejection, and metal-over-glass operation. The device uses a unified FRAM memory architecture (15 KB program + 512 B info FRAM) with ECC, enabling fast nonvolatile writes and 10¹⁵ endurance cycles without wear leveling.

Key Specifications

Pinout & Package

Package: 32-pin VQFN (RHB), 5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad. Designed for high-density PCB layouts with low-inductance ground return paths critical for noise-immune capacitive sensing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR2533IRHBT, the MSP430FR2633IRHBT offers greater electrode scalability and memory headroom for advanced UI features, while the MSP430FR2532IRHBT trades capacity for lower BOM cost and smaller code size - making MSP430FR2533IRHBT the optimal balance for mid-tier touch HMI applications requiring reliability, low power, and design flexibility.

Availability

MSP430FR2533IRHBT is available at Aetrix Electronics and suitable for smart lock keypads, appliance control panels, and garage door remotes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.

Supply support for MSP430FR2533IRHBT 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 microcontrollers and precision analog design.

The MSP430FR253x product line was engineered specifically for cost-effective, battery-efficient capacitive touch human-machine interfaces - integrating CapTIvate technology, FRAM memory, and intelligent peripherals into a single chip optimized for industrial and consumer HMI applications.

FAQ

What is the maximum number of capacitive touch electrodes supported by the MSP430FR2533IRHBT?

The MSP430FR2533IRHBT supports up to 16 self-capacitive electrodes or 24 mutual-capacitive electrodes. This configuration is confirmed in the device comparison table and functional description of the CapTIvate module. Electrode count is fixed per variant - the MSP430FR2533IRHBT does not scale beyond 24 mutual-cap channels, unlike the MSP430FR2633IRHBT which supports 64. All electrodes are managed autonomously by the hardware CapTIvate engine without CPU intervention during scanning.

Does the MSP430FR2533IRHBT include an integrated hardware CRC module?

Yes, the MSP430FR2533IRHBT includes a dedicated 16-bit cyclic redundancy check (CRC) module. This peripheral is explicitly listed under "Intelligent digital peripherals" in the device overview and used for memory integrity verification, particularly over FRAM regions. The CRC engine operates independently of the CPU and supports programmable seed values and polynomial configurations, enabling robust firmware validation and data transmission error checking in safety-critical touch applications.

What package type and pin count does the MSP430FR2533IRHBT use?

The MSP430FR2533IRHBT uses a 32-pin VQFN (RHB) package measuring 5 mm × 5 mm with 0.5 mm pitch and an exposed thermal pad. This is verified in the Device Information table and Package Options section of the datasheet. The RHB suffix in the part number directly denotes this VQFN-32 variant, distinguishing it from TSSOP-32 (DA), VQFN-24 (RGE), and DSBGA-24 (YQW) variants within the same family.

Can the MSP430FR2533IRHBT operate from a single 1.8-V supply?

Yes, the MSP430FR2533IRHBT supports operation down to 1.8 V, as specified in the Recommended Operating Conditions table. However, the minimum functional voltage is constrained by SVS (supply voltage supervisor) thresholds - the device requires DVCC ≥ 1.8 V to maintain stable internal regulation and CapTIvate module functionality. At 1.8 V, active current remains within spec (126 µA/MHz), and wake-on-touch performance is preserved, enabling direct use with two alkaline cells or single Li-ion configurations with appropriate regulation.

Is the CapTIvate Design Center software compatible with the MSP430FR2533IRHBT?

Yes, the CapTIvate Design Center PC GUI fully supports the MSP430FR2533IRHBT. This is confirmed in the "Development tools and software" section, which lists the MSP430FR2533 among supported devices and references real-time tuning capability without code changes. The tool leverages ROM-resident CapTIvate firmware and communicates via USB-to-SBW adapter (e.g., CAPTIVATE-PGMR), enabling live adjustment of electrode sensitivity, debounce timing, and noise filter parameters directly on target hardware.