Texas Instruments MSP430G2855IRHA40T

Overview

MSP430G2855IRHA40T from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 48 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), and on-chip comparator for analog signal compare or slope A/D conversion - deployed in battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2855IRHA40T datasheet, MSP430G2855IRHA40T pinout, MSP430G2855IRHA40T application, or MSP430G2855IRHA40T equivalent, key selection criteria include flash size (48 kB), ADC channel count (12), USCI dual-interface support, QFN-40 package footprint, and verified LPM3/LPM4 current draw (0.7 µA / 0.1 µA).

Technical Context

The MSP430G2855IRHA40T implements a 16-bit RISC CPU with 62.5-ns instruction cycle time, constant generators, and seven addressing modes. Its basic clock system integrates DCO (calibrated up to 16 MHz), 32-kHz crystal support, and internal VLO oscillator - enabling sub-1-µs wake-up from standby mode.

Peripherals are memory-mapped and accessible via all instructions. The device supports five low-power modes (LPM0–LPM4), with interrupt-driven wake-up from any mode. Flash programming occurs via Spy-Bi-Wire or BSL UART, with security fuse protection and segment-level erase capability.

Key Specifications

Pinout & Package

40-pin QFN (RHA) package with exposed thermal pad (connected to DVSS). Pin functions follow TI SLAS800 Rev. March 2013, Table 2. Pin numbering aligns with RHA column; all pins support digital I/O unless designated for analog, clock, or debug functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2855IRHA40T, the MSP430G2955IRHA40 offers 16 kB more flash and 8 extra I/O pins without increasing power consumption or changing package, while the MSP430G2755IRHA40 reduces flash by 16 kB and I/O by 16 pins - enabling tiered product variants from a common hardware platform.

Availability

MSP430G2855IRHA40T is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical monitors, industrial remote I/O modules, and energy harvesting nodes requiring stable component supply, long-term lifecycle assurance, and qualified sourcing for production ramp.

Supply support for MSP430G2855IRHA40T 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 focus on power efficiency, reliability, and system integration.

The MSP430G2xx family targets ultra-low-power portable measurement and sensing applications, emphasizing extended battery life, integrated analog front-ends, and flexible communication interfaces - with MSP430G2855IRHA40T optimized for mid-tier flash and I/O requirements in QFN-40 form factor.

FAQ

What is the maximum operating frequency of the MSP430G2855IRHA40T?

The MSP430G2855IRHA40T supports a maximum MCLK frequency of 16 MHz, achieved using the internal digitally controlled oscillator (DCO) calibrated at factory and stored in information memory segment A. External HF crystal up to 16 MHz is also supported, and the DCO stabilizes in less than 1 µs - enabling rapid wake-up from low-power modes while maintaining timing accuracy for real-time tasks in the MSP430G2855IRHA40T.

Does the MSP430G2855IRHA40T support hardware UART with auto-baud detection?

Yes, the MSP430G2855IRHA40T's USCI_A0 module provides enhanced UART functionality including LIN-compliant auto-baudrate detection. This feature allows the MSP430G2855IRHA40T to automatically synchronize to incoming serial frames without prior knowledge of the transmitter's baud rate - critical for interoperability in automotive and industrial networks where master/slave timing may vary.

How many ADC input channels does the MSP430G2855IRHA40T support, and what is their resolution?

The MSP430G2855IRHA40T integrates a 10-bit ADC10 module with 12 selectable analog input channels (A0–A7, A12–A15), supporting autoscan mode for sequential conversion without CPU intervention. It includes internal 1.5-V/2.5-V references and sample-and-hold, delivering 200-ksps throughput - sufficient for high-fidelity sensor sampling in the MSP430G2855IRHA40T's target applications.

Can the MSP430G2855IRHA40T perform analog comparisons without using the ADC?

Yes, the MSP430G2855IRHA40T includes a dedicated on-chip comparator_A+ module with eight inputs (CA0–CA7) and programmable hysteresis. It supports analog signal compare functions and slope analog-to-digital conversion - enabling zero-crossing detection, threshold monitoring, or simple A/D without consuming ADC resources or CPU cycles in the MSP430G2855IRHA40T.

What debug interface does the MSP430G2855IRHA40T use, and does it require external voltage?

The MSP430G2855IRHA40T uses Spy-Bi-Wire (SBW), a 2-wire JTAG variant implemented on pins TEST/SBWTCK and RST/NMI/SBWTDIO. It operates from the core supply (DVCC) - no external programming voltage is required. On-chip emulation logic enables full-speed debugging, breakpoint setting, and flash programming, making the MSP430G2855IRHA40T suitable for rapid prototyping and field firmware updates.