Texas Instruments MSP430G2855IRHA40R

Overview

MSP430G2855IRHA40R 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, one 16-bit Timer_B module, 10-bit 200-ksps ADC with 12-channel autoscan, USCI_A0 (UART/LIN/IrDA/SPI) and USCI_B0 (SPI/I²C), and up to 48 GPIO pins in a 40-pin QFN package. It targets battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2855IRHA40R datasheet, MSP430G2855IRHA40R pinout, MSP430G2855IRHA40R application, or MSP430G2855IRHA40R equivalent, key selection criteria include its 48 kB flash capacity, 12-channel ADC with internal reference, dual USCI interfaces supporting LIN and I²C, ultra-low standby current (0.7 µA), and QFN-40 packaging for space-constrained designs.

Technical Context

The MSP430G2855IRHA40R 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 at 1/8/12/16 MHz), 32-kHz crystal support, and internal LF oscillator - enabling sub-1-µs wake-up from LPM3/LPM4.

Peripherals include two independent 16-bit Timer_A modules (each with three capture/compare registers), one 16-bit Timer_B (three capture/compare), COMP_A+ with eight analog inputs, and dual USCI modules supporting simultaneous UART, SPI, and I²C protocols - all configurable via register-level control without external components.

Key Specifications

Pinout & Package

40-pin QFN (RHA) package with exposed thermal pad connected to DVSS; 0.5-mm pitch, 6 × 6 mm body size, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2955IRHA40, the MSP430G2855IRHA40R offers identical peripheral set and power profile but 8 kB less flash - ideal for cost-sensitive, fixed-function sensor nodes. Versus MSP430FR2633IRHBT, it trades FRAM endurance and integrated CapTIvate for higher flash density and broader analog capability, better suited to mixed-signal measurement over pure touch control.

Availability

MSP430G2855IRHA40R is available at Aetrix Electronics and suitable for smart utility meters, industrial temperature monitors, wireless thermostats, portable gas detectors, and battery-powered environmental sensors requiring stable component supply across multi-year production cycles.

Supply support for MSP430G2855IRHA40R 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 over 50 years of microcontroller innovation.

The MSP430G2xx family was designed specifically for ultra-low-power sensing and measurement applications - prioritizing nanowatt sleep modes, integrated analog peripherals, and robust mixed-signal performance in compact packages like the MSP430G2855IRHA40R.

FAQ

What is the maximum operating frequency of the MSP430G2855IRHA40R's DCO?

The MSP430G2855IRHA40R's digitally controlled oscillator (DCO) is factory-calibrated at four frequencies: 1 MHz, 8 MHz, 12 MHz, and 16 MHz. When configured with RSEL = 15 and DCO = 15, the DCO delivers up to 16 MHz - sufficient for full-speed UART at 115.2 kbps and 200-ksps ADC sampling with oversampling. The DCO stabilizes in under 1 µs, enabling rapid wake-up from LPM4.

Does the MSP430G2855IRHA40R support hardware UART auto-baudrate detection?

Yes, the MSP430G2855IRHA40R's USCI_A0 module includes dedicated hardware for LIN-compliant auto-baudrate detection. By enabling UCAxCTL1 |= UCSWRST followed by UCAxIRCTL |= UCAxIREN, the module automatically measures incoming break-field duration and configures baud rate without CPU intervention - critical for robust communication in noisy automotive or industrial environments.

How many ADC channels does the MSP430G2855IRHA40R support, and what is the reference configuration?

The MSP430G2855IRHA40R supports 12 selectable ADC10 input channels (A0–A7, A12–A15) with internal 1.5-V or 2.5-V reference, external reference (VREF+/VREF−), or AVCC. The ADC10 uses sample-and-hold with autoscan mode - allowing sequential conversion of all 12 channels in a single trigger event, essential for synchronized multi-sensor acquisition in the MSP430G2855IRHA40R.

Can the MSP430G2855IRHA40R drive an LCD directly?

No, the MSP430G2855IRHA40R does not include an integrated LCD controller or charge pump. Unlike higher-tier MSP430FRxx or MSP430Fxx devices, it lacks LCD segment drivers and bias generation circuitry. For LCD interfacing, external driver ICs (e.g., PCF8576) or segment-mapped GPIO with software-based static/dynamic drive must be used - limiting resolution and duty cycle in the MSP430G2855IRHA40R design.

What debug interface does the MSP430G2855IRHA40R use, and is JTAG supported?

The MSP430G2855IRHA40R uses Spy-Bi-Wire (SBW), a 2-wire subset of JTAG implemented on TEST/SBWTCK (Pin 1) and RST/NMI/SBWTDIO (Pin 5). Full 4-wire JTAG is not supported. SBW provides complete flash programming, breakpoint setting, and real-time register inspection via TI's MSP-FET or LaunchPad debuggers - with minimal PCB footprint and no external level-shifting required for the MSP430G2855IRHA40R.