Texas Instruments MSP430F149IRTDR

Overview

MSP430F149IRTDR from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 60KB flash, 2KB RAM, a 12-bit ADC with 8 channels and internal reference, dual 16-bit timers (Timer_A3 and Timer_B7), two USARTs supporting UART/SPI, and on-chip comparator. It operates from 1.8 V to 3.6 V and targets battery-powered sensor systems and portable measurement devices.

For engineers reviewing the MSP430F149IRTDR datasheet, MSP430F149IRTDR pinout, MSP430F149IRTDR application, or MSP430F149IRTDR equivalent, key selection criteria include its 64-pin VQFN package, 48 I/O pins, wake-up time under 6 µs from standby, integrated hardware multiplier, and dual-USART support for simultaneous serial communication in industrial control and handheld metering designs.

Technical Context

The MSP430F149IRTDR implements a 16-bit CPU with constant generators and 16-bit registers for high code efficiency. Its five low-power modes-including LPM3 with 1.6 µA standby current and 0.1 µA off-mode RAM retention-are optimized for extended battery life in portable instrumentation.

It integrates a digitally controlled oscillator (DCO) enabling sub-6-µs wake-up, dual crystal oscillators (LFXT1 and XT2), and a 12-bit ADC with sample-and-hold, autoscan, and <10 µs conversion time-supporting precise analog sensing without external components.

Key Specifications

Pinout & Package

Package: 64-pin VQFN (9 mm × 9 mm), thermally enhanced with exposed thermal pad connected to DVSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F149IPM, the MSP430F149IRTDR offers superior thermal dissipation via its exposed pad, while MSP430F1491IRTD provides identical functionality with enhanced manufacturing consistency-both retain full software and pin compatibility with the original MSP430F149IRTDR.

Availability

MSP430F149IRTDR is available at Aetrix Electronics and suitable for smart sensor nodes, industrial data loggers, and portable energy meters requiring stable component supply across multi-year production cycles.

Supply support for MSP430F149IRTDR 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 deep expertise in low-power design and industrial-grade reliability.

The MSP430F149IRTDR belongs to TI's MSP430F14x ultra-low-power MCU family, engineered specifically for battery-operated measurement and control applications where energy efficiency, integration, and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the MSP430F149IRTDR?

The MSP430F149IRTDR does not have a fixed maximum clock frequency specification; instead, it uses a digitally controlled oscillator (DCO) whose output is calibrated and scaled via software. Per SLAS272H Section 5.18, DCO frequency ranges from ~100 kHz to ~8 MHz depending on MCLK configuration, with typical operation up to 8 MHz using XT2. The device achieves a 125-ns instruction cycle time at 8 MHz, confirming full-speed execution capability at that rate. MSP430F149IRTDR supports this performance within its 1.8–3.6 V supply range.

Does the MSP430F149IRTDR support in-system programming without external voltage?

Yes, the MSP430F149IRTDR supports serial onboard programming (SBP) via its built-in bootloader (BSL), requiring no external programming voltage. Programming is performed through UART or SPI using standard 1.8–3.6 V supply levels. The BSL is activated via RST/NMI and TCK pins, and code protection is enforced by a security fuse. This capability enables field firmware updates and eliminates the need for dedicated high-voltage programmers. MSP430F149IRTDR fully complies with this feature as documented in Section 6.5 of SLAS272H.

How many analog input channels does the MSP430F149IRTDR ADC support?

The MSP430F149IRTDR integrates a 12-bit ADC12 module supporting exactly 8 analog input channels (A0–A7), mapped to P6.0 through P6.7. These inputs accept single-ended or differential signals and are selectable via the ADC12MCTLx registers. The ADC supports internal reference (2.5 V), external reference, or AVCC as reference sources. This 8-channel capability is confirmed in Table 3-1 and Section 1.1 of SLAS272H, and applies identically to the MSP430F149IRTDR variant.

Is the MSP430F149IRTDR pin-compatible with other MSP430F14x devices in VQFN-64?

Yes, the MSP430F149IRTDR is pin-compatible with all other MSP430F14x and MSP430F14x1 devices offered in the 64-pin VQFN (RTD) package, including MSP430F148IRTDR, MSP430F147IRTDR, and MSP430F1491IRTD. Pin functions, power domains, and JTAG interface locations match exactly per Figures 4-2 and 4-3 and Table 4-1 of SLAS272H. This allows direct substitution in existing layouts when memory or peripheral requirements change, provided firmware is updated to match the specific device's flash/RAM size and feature set. MSP430F149IRTDR maintains full signal-level compatibility.

What is the purpose of the TBOUTH pin on the MSP430F149IRTDR?

The TBOUTH pin (Pin 51) on the MSP430F149IRTDR is a dedicated Timer_B output control signal that places all Timer_B PWM outputs (TB0–TB6) into high-impedance state simultaneously. This feature enables safe, glitch-free shutdown of multiple PWM-driven loads-such as motor phases or LED strings-without requiring individual GPIO toggling. It is particularly valuable in fault-handling routines and power sequencing. TBOUTH behavior is defined in Section 6.8.4 of SLAS272H and is unique to Timer_B7 implementations found in MSP430F149IRTDR and related F14x devices.