Texas Instruments MSP430G2955IRHA40T

Overview

MSP430G2955IRHA40T from Texas Instruments is a 16-bit ultra-low-power 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 ADC with internal reference and autoscan, USCI_A0 (UART/LIN/IrDA/SPI) and USCI_B0 (SPI/I²C), and up to 32 touch-sense-capable I/O pins in a 40-pin QFN package. It targets battery-powered sensor nodes and portable measurement systems requiring sub-1µs wake-up and <0.1 µA off-mode retention.

For engineers reviewing the MSP430G2955IRHA40T datasheet, MSP430G2955IRHA40T pinout, MSP430G2955IRHA40T application, or MSP430G2955IRHA40T equivalent, key selection criteria include its 56 kB flash capacity, 12-channel ADC with VREF+/VREF− inputs, QFN-40 pin mapping for high-density PCB layout, and support for LIN bus auto-baudrate detection in UART mode.

Technical Context

The MSP430G2955IRHA40T implements a 16-bit RISC CPU with 62.5-ns instruction cycle time, constant generators, and seven addressing modes. Its clock system integrates DCO (calibrated up to 16 MHz), 32-kHz crystal support, and internal LF oscillator - enabling five low-power modes including LPM4 with 0.1 µA retention.

Peripherals are memory-mapped and accessible via all instructions. The USCI_A0 module supports enhanced UART with LIN auto-baudrate detection and IrDA encoding/decoding; USCI_B0 provides full-duplex SPI and I²C master/slave operation. The on-chip comparator (COMP_A+) supports slope A/D conversion and analog signal thresholding.

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 ultra-low-power mixed-signal microcontroller applications.

Compared with MSP430G2855IRHA40 and MSP430G2755IRHA40, the MSP430G2955IRHA40T provides 25% more flash than the G2855 and 75% more than the G2755, enabling complex sensor fusion algorithms and larger OTA update partitions while retaining identical power profiles and QFN-40 mechanical compatibility.

Availability

MSP430G2955IRHA40T is available at Aetrix Electronics and suitable for wireless sensor networks, portable medical devices, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MSP430G2955IRHA40T 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 and embedded processing solutions for industrial, automotive, and consumer applications.

The MSP430G2xx family delivers ultra-low-power mixed-signal microcontrollers optimized for battery-operated sensor systems, portable instrumentation, and energy-constrained IoT endpoints - with emphasis on sub-1 µA sleep currents and fast wake-up response.

FAQ

What is the maximum operating frequency of the MSP430G2955IRHA40T?

The MSP430G2955IRHA40T supports an internal digitally controlled oscillator (DCO) calibrated up to 16 MHz, with additional clock sources including 32-kHz crystal (XIN/XOUT), internal very-low-power LF oscillator, and external digital clock input. The DCO calibration data is stored in information memory segment A, ensuring stable operation across voltage and temperature ranges. This allows the MSP430G2955IRHA40T to execute instructions at 16 MHz while maintaining ultra-low-power characteristics in active mode.

Does the MSP430G2955IRHA40T support LIN bus communication?

Yes, the MSP430G2955IRHA40T supports LIN bus communication through its USCI_A0 module, which includes enhanced UART functionality with automatic baudrate detection (LIN auto-baud). This feature enables reliable frame synchronization without requiring external LIN transceivers or precise timing references, making the MSP430G2955IRHA40T suitable for automotive body electronics and industrial control networks compliant with LIN 2.x specifications.

How many analog input channels does the ADC10 module support on the MSP430G2955IRHA40T?

The ADC10 module on the MSP430G2955IRHA40T supports 12 analog input channels (A0–A7, A12–A15), with additional dedicated pins for VREF+ and VREF− reference inputs. These channels are accessible via multiplexed GPIO pins including P2.0–P2.4, P3.6–P3.7, and P4.0–P4.7. The ADC10 also features internal 1.5 V/2.5 V reference generation, sample-and-hold, and hardware autoscan mode - allowing sequential conversion of all 12 channels without CPU intervention.

Can the MSP430G2955IRHA40T perform capacitive touch sensing without external components?

Yes, the MSP430G2955IRHA40T integrates capacitive touch-sense oscillator enable bits on up to 32 GPIO pins (P1–P4), allowing direct implementation of touch buttons, sliders, and wheels without external RC networks or dedicated touch controller ICs. Each pin's oscillator can be independently enabled and monitored via software, and the built-in comparator (COMP_A+) supports charge-transfer measurement techniques for robust noise immunity in noisy environments.

What debug interface does the MSP430G2955IRHA40T use?

The MSP430G2955IRHA40T uses the Spy-Bi-Wire (SBW) interface for debugging and programming, requiring only two pins: TEST/SBWTCK (pin 1) and RST/NMI/SBWTDIO (pin 6). This two-wire interface replaces traditional JTAG, reducing PCB footprint and connector complexity while supporting full-speed emulation, flash programming, and real-time variable inspection. The SBW interface operates at voltages from 1.8 V to 3.6 V and is compatible with TI's MSP-FET and LaunchPad development tools.