Texas Instruments MSP430F1491IPM

Overview

MSP430F1491IPM from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 60KB flash, 2KB RAM, a 12-bit ADC with 8 analog inputs, dual USARTs (UART/SPI), two 16-bit timers (Timer_A3 and Timer_B7), and on-chip comparator. It operates from 1.8 V to 3.6 V and supports five power-saving modes, enabling battery-powered sensor systems and portable meters.

For engineers reviewing the MSP430F1491IPM datasheet, MSP430F1491IPM pinout, MSP430F1491IPM application, or MSP430F1491IPM equivalent, this page delivers verified functional specifications, validated package mapping (64-pin LQFP), confirmed peripheral register allocation, real-world use-case context for industrial sensing and metering, and two technically documented alternative parts with explicit functional and application-level distinctions.

Technical Context

The MSP430F1491IPM implements a 16-bit RISC CPU with constant generators and hardware multiplier, achieving 125-ns instruction cycle time. Its clock system integrates DCO, LFXT1 (32.768 kHz crystal), and XT2 (up to 8 MHz) oscillators, with ACLK, SMCLK, and MCLK domains independently configurable for optimal low-power operation.

Peripherals include a 12-bit ADC12 with internal reference, autoscan, and <10 µs conversion time; Timer_B7 with seven capture/compare registers and shadow registers for glitch-free PWM; and two full-duplex USARTs supporting asynchronous UART and synchronous SPI protocols - all accessible via 48 GPIO pins with interrupt capability across six I/O ports.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm), RoHS-compliant, 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 and MSP430F1481IPM, the MSP430F1491IPM provides guaranteed ROM-resident BSL for secure in-field updates and full 60KB flash for advanced firmware features - making it optimal for certified industrial and utility-grade devices requiring long-term maintainability.

Availability

MSP430F1491IPM is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, portable safety instruments, and water quality monitors requiring stable component supply across multi-year production cycles.

Supply support for MSP430F1491IPM 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 MSP430F14x1 family was engineered specifically for battery-operated measurement and control applications - emphasizing extended runtime, integrated analog front-ends, and robust firmware update capabilities in harsh environments.

FAQ

What is the maximum operating frequency of the MSP430F1491IPM?

The MSP430F1491IPM does not specify a maximum CPU clock frequency in its datasheet; instead, it guarantees correct operation up to 8 MHz using the XT2 oscillator and up to 1 MHz using the DCO in calibrated mode. Its 16-bit RISC architecture achieves a 125-ns instruction cycle time, meaning it executes instructions at up to 8 MIPS under ideal conditions. The actual usable frequency depends on supply voltage and selected clock source - for example, at 2.2 V, the DCO supports up to ~1 MHz reliably, while XT2 enables full 8 MHz operation. MSP430F1491IPM performance is optimized for efficiency, not raw speed.

Does the MSP430F1491IPM support USB communication?

No, the MSP430F1491IPM does not include a USB peripheral or physical transceiver. It provides two USART modules that support UART and SPI protocols only. To implement USB connectivity, an external USB-to-UART bridge IC (e.g., CP2102 or FT232R) must be used in conjunction with MSP430F1491IPM's USART0 or USART1. This architecture maintains the MCU's ultra-low-power profile while offloading USB protocol handling to a dedicated interface chip. MSP430F1491IPM firmware communicates with the bridge via standard UART framing.

How many ADC channels does the MSP430F1491IPM support, and what input configurations are available?

The MSP430F1491IPM integrates the ADC12 module with eight external analog input channels (A0–A7) mapped to P6.0 through P6.7. It supports single-ended, differential, and temperature sensor inputs, with selectable internal references (1.5 V or 2.5 V) or external reference (VeREF+). The module includes sample-and-hold, autoscan mode for sequential channel conversion, and built-in VMID generator for ratiometric measurements. MSP430F1491IPM ADC12 achieves <10 µs conversion time and 12-bit linearity within ±1 LSB, making it suitable for precision analog sensing without external signal conditioning.

Is the MSP430F1491IPM pin-compatible with the MSP430F149IPM?

Yes, the MSP430F1491IPM is pin-compatible with the MSP430F149IPM in the same 64-pin LQFP (PM) package - all signals, power pins, and I/O assignments match exactly. However, the '1' suffix denotes inclusion of ROM-resident bootloader (BSL), which changes the reset vector behavior and enables UART-based firmware updates without JTAG. While PCB layout is interchangeable, firmware and startup initialization must account for BSL presence. MSP430F1491IPM retains full functional equivalence for all peripherals, timers, and analog modules.

What debug interfaces are supported by the MSP430F1491IPM?

The MSP430F1491IPM supports standard 4-wire JTAG (TCK, TMS, TDI/TCLK, TDO/TDI) for full-speed debugging, flash programming, and boundary-scan testing. It also supports Spy-Bi-Wire (2-wire JTAG) for space-constrained designs. Additionally, the ROM-based BSL enables UART-based firmware loading and verification using USART0 or USART1 - eliminating the need for dedicated debug hardware in production programming. MSP430F1491IPM debug access remains fully functional across all power modes except LPM4, where JTAG is disabled but BSL remains accessible via wake-up on UART activity.