Texas Instruments MSP430G2755IRHA40R

Overview

MSP430G2755IRHA40R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 32 kB flash, 4 kB RAM, two 16-bit Timer_A modules, one 16-bit Timer_B module, a 10-bit 200-ksps ADC with 12-channel 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 operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2755IRHA40R datasheet, MSP430G2755IRHA40R pinout, MSP430G2755IRHA40R application, or MSP430G2755IRHA40R equivalent, key selection criteria include its 32 kB flash size, 32 I/O count with touch-sense support, dual USCI interfaces, 10-bit ADC performance at 200 ksps, and verified LPM4 current of 0.1 µA with RAM retention.

Technical Context

The MSP430G2755IRHA40R implements a 16-bit RISC CPU with 62.5-ns instruction cycle time, constant generators for code efficiency, and five software-selectable low-power modes optimized for extended battery life. Its basic clock system integrates a digitally controlled oscillator (DCO), internal LF oscillator, and external crystal support up to 16 MHz.

Peripheral integration includes a comparator_A+ with eight input channels, brownout detector, programmable security fuse, on-chip BSL for UART-based flash programming, and Spy-Bi-Wire debug interface. All timers support capture/compare, PWM, and interrupt generation - Timer_A3 provides three capture/compare registers per module, Timer_B3 provides three with high-impedance output control.

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 MSP430G2755IRHA40R, the G2855 and G2955 offer increased flash and I/O while preserving identical ultra-low-power operation, timer architecture, and USCI functionality - making them drop-in upgrades for designs needing headroom without changing PCB layout or power design.

Availability

MSP430G2755IRHA40R 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 and long-term manufacturability.

Supply support for MSP430G2755IRHA40R 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 design.

The MSP430G2xx series was engineered specifically for energy-constrained applications such as battery-operated sensors, portable instrumentation, and green-energy systems - emphasizing sub-µA standby current, fast wake-up, and integrated analog signal chain capability.

FAQ

What is the maximum operating frequency of the MSP430G2755IRHA40R?

The MSP430G2755IRHA40R supports a maximum system clock (MCLK) frequency of 16 MHz using an external HF crystal or calibrated DCO. Its 16-bit RISC core achieves a 62.5-ns instruction cycle time at this rate, enabling deterministic real-time execution. Internal DCO calibration values for 1/8/12/16 MHz are factory-stored in information memory segment A for reliable startup without external components.

Does the MSP430G2755IRHA40R support hardware UART auto-baudrate detection?

Yes, the MSP430G2755IRHA40R's USCI_A0 module includes enhanced UART functionality with hardware auto-baudrate detection (LIN-compliant). This feature allows the device to automatically synchronize to incoming serial streams without prior knowledge of bit rate, reducing host-side configuration overhead in sensor network gateways and diagnostic tools.

How many analog input channels does the ADC10 in the MSP430G2755IRHA40R support?

The ADC10 in the MSP430G2755IRHA40R supports 12 analog input channels (A0–A7, A12–A15) with autoscan capability. These channels are mapped across P2.x, P3.x, and P4.x pins and can be sequenced in hardware without CPU intervention, enabling efficient low-power acquisition of multiple sensor signals in a single conversion burst.

Can the MSP430G2755IRHA40R perform capacitive touch sensing without external components?

Yes, the MSP430G2755IRHA40R integrates pin-oscillator circuitry on all 32 GPIOs (P1–P4), enabling self-capacitance touch sensing using only firmware and PCB traces - no external RC networks or dedicated touch controller ICs required. The built-in comparator_A+ and Timer_A modules provide the timing and signal conditioning needed for robust touch detection.

What debug interface does the MSP430G2755IRHA40R use, and what pins are required?

The MSP430G2755IRHA40R uses the two-pin Spy-Bi-Wire (SBW) interface for programming and debugging, requiring only TEST/SBWTCK (Pin 1) and RST/NMI/SBWTDIO (Pin 5). This eliminates the need for a full 4-wire JTAG header, reducing PCB space and BOM cost while maintaining full flash erase/write, breakpoint, and register visibility capabilities.