Texas Instruments MSP430G2955IRHA40R

Overview

MSP430G2955IRHA40R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 56 kB flash, 4 kB RAM, dual 16-bit Timer_A modules (TA0/TA1), one 16-bit Timer_B (TB0), 12-channel 10-bit 200-ksps ADC with internal reference and autoscan, USCI_A0 (UART/LIN/IrDA/SPI) and USCI_B0 (SPI/I²C), on-chip comparator, and up to 32 touch-sense-capable I/O pins - deployed in battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2955IRHA40R datasheet, MSP430G2955IRHA40R pinout, MSP430G2955IRHA40R application, or MSP430G2955IRHA40R equivalent, key selection considerations include its 40-pin QFN (RHA) package, 56 kB flash capacity, LIN-capable UART with auto-baud detection, sub-1 µs wake-up from 0.7 µA standby mode, and integrated analog front-end for direct sensor interfacing without external signal conditioning.

Technical Context

The MSP430G2955IRHA40R implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock system integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, internal LF oscillator, and programmable MCLK/SMCLK/ACLK routing - all optimized for rapid transition between five low-power modes.

Peripheral integration includes two independent 16-bit Timer_A modules (each with three capture/compare registers), one 16-bit Timer_B (three CC registers), a 10-bit ADC with sample-and-hold and DTC support, and dual USCI modules supporting simultaneous asynchronous and synchronous communication - enabling concurrent sensor acquisition, local processing, and host interface via UART/I²C/SPI.

Key Specifications

Pinout & Package

Package: 40-pin QFN (RHA), 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad connected to DVSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2855IRHA40, the MSP430G2955IRHA40R provides 8 kB more flash and 8 additional I/O for expanded feature sets; versus MSP430FR2633IRHBT, it retains full dual-USCI flexibility and flash endurance at the cost of higher write energy and erase cycles.

Availability

MSP430G2955IRHA40R is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, industrial control panels, and smart meter interface modules requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.

Supply support for MSP430G2955IRHA40R 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 system integration.

The MSP430G2xx series targets ultra-low-power embedded applications - designed specifically for battery-operated sensor systems, portable instrumentation, and energy-harvesting devices where nanowatt-level standby and fast wake-up are critical.

FAQ

What is the maximum operating frequency of the MSP430G2955IRHA40R?

The MSP430G2955IRHA40R supports up to 16 MHz system clock via HF crystal or calibrated DCO. Its 16-bit RISC core achieves a 62.5-ns instruction cycle time at this frequency, enabling real-time response in time-critical sensor processing tasks. The device maintains full functionality across its 1.8–3.6 V supply range at 16 MHz, with internal calibration data stored in information memory segment A ensuring consistent DCO accuracy.

Does the MSP430G2955IRHA40R support hardware UART auto-baudrate detection?

Yes, the MSP430G2955IRHA40R's USCI_A0 module includes dedicated auto-baudrate detection logic for LIN-compliant UART operation. It measures the duration of the start bit and first data bit to automatically configure baud rate without CPU intervention - essential for robust communication in automotive body networks and legacy industrial interfaces where host baud rates vary.

How many analog input channels does the MSP430G2955IRHA40R ADC support?

The MSP430G2955IRHA40R features a 10-bit ADC10 with 12 selectable analog input channels (A0–A7, A12–A15), all accessible through the 40-pin RHA package. Channel selection is managed via the ADC10CTL1 register, and autoscan mode allows sequential conversion of up to 16 channels without software overhead - directly supporting multi-sensor monitoring in compact designs.

Can the MSP430G2955IRHA40R perform capacitive touch sensing without external components?

Yes, the MSP430G2955IRHA40R supports capacitive touch sensing on up to 32 GPIO pins using its integrated pin oscillator and built-in comparator. No external RC networks or dedicated touch controller ICs are required - the firmware configures selected pins as oscillators, measures frequency shift caused by finger proximity, and processes results using Timer_A capture registers and software algorithms.

What debug interface does the MSP430G2955IRHA40R use?

The MSP430G2955IRHA40R uses the two-wire Spy-Bi-Wire (SBW) interface via TEST/SBWTCK (Pin 1) and RST/NMI/SBWTDIO (Pin 5) for programming and debugging. This interface is electrically compatible with standard JTAG but requires only two pins - significantly reducing PCB routing complexity compared to four-wire JTAG while maintaining full flash erase, program, and breakpoint capabilities.