Texas Instruments MSP430F1491IPMR

Overview

MSP430F1491IPMR 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 MSP430F1491IPMR datasheet, MSP430F1491IPMR pinout, MSP430F1491IPMR application, or MSP430F1491IPMR equivalent, key selection criteria include its 64-pin LQFP package, 48 GPIOs, integrated ADC reference, DCO-based sub-6-µs wake-up from standby, and dual-serial interface support for sensor-to-host communication and firmware updates.

Technical Context

The MSP430F1491IPMR implements a 16-bit RISC CPU with constant generators and hardware multiplier, optimized for code efficiency in low-power embedded control. Its clock system includes digitally controlled oscillator (DCO), LFXT1 (32.768 kHz crystal), and XT2 (up to 8 MHz) oscillators, supporting flexible system timing across active and low-power modes.

Peripherals are tightly integrated via shared bus architecture: ADC12 uses internal/external references and autoscan; Timer_B7 provides seven capture/compare registers with shadow registers for glitch-free PWM; USART0/USART1 operate independently in UART or SPI mode with programmable baud rates and automatic flow control support.

Key Specifications

Pinout & Package

LQFP-64 (10 mm × 10 mm) package with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F149IPM and MSP430F1491IRTD, the MSP430F1491IPMR offers identical functionality in a standard LQFP-64 package with exposed thermal pad - providing optimal thermal performance and ease of manual rework while maintaining full compatibility with existing MSP430F14x1 toolchains and firmware.

Availability

MSP430F1491IPMR is available at Aetrix Electronics and suitable for industrial process monitors, portable energy meters, smart sensor nodes, and low-power data loggers requiring stable component supply and long-term manufacturability.

Supply support for MSP430F1491IPMR 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 MSP430F14x1 product line was engineered for ultra-low-power, battery-operated measurement and control applications - emphasizing extended runtime, integrated analog front-ends, and robust peripheral sets for sensor signal conditioning and communication.

FAQ

What is the maximum operating frequency of the MSP430F1491IPMR?

The MSP430F1491IPMR does not have a fixed maximum clock frequency specification. Its digitally controlled oscillator (DCO) supports system clock frequencies up to approximately 8 MHz when driven by the XT2 oscillator (via external crystal), and lower frequencies with LFXT1 or internal DCO tuning. The 125-ns instruction cycle corresponds to a 8-MHz CPU clock, and all timing parameters in the datasheet are validated up to this rate. The MSP430F1491IPMR is not rated for operation above 8 MHz.

Does the MSP430F1491IPMR support in-system programming without external hardware?

Yes, the MSP430F1491IPMR includes a factory-programmed bootstrap loader (BSL) that enables in-system programming via UART or SPI interfaces without external programmers. The BSL is accessed through dedicated pins (e.g., RST/NMI and UART lines) and requires no external programming voltage - allowing firmware updates directly in the end application using standard serial communication.

How many analog input channels does the ADC12 module support on the MSP430F1491IPMR?

The ADC12 module on the MSP430F1491IPMR supports eight analog input channels (A0–A7), mapped to P6.0 through P6.7. These inputs are accessible via dedicated ADC12MEMx registers and support autoscan mode for sequential conversion without CPU intervention. External analog signals applied to these pins are digitized with 12-bit resolution and selectable reference sources (internal 2.5 V or external).

Is the MSP430F1491IPMR pin-compatible with the MSP430F149IPM?

Yes, the MSP430F1491IPMR and MSP430F149IPM share identical pin functions and numbering in their respective 64-pin LQFP and TQFP packages. Both devices implement the same peripheral mapping, register layout, and electrical characteristics per pin. However, mechanical differences - such as thermal pad presence (LQFP-64 PM has exposed pad; TQFP-64 PAG does not) and package dimensions - require verification in PCB layout and assembly processes.

What are the key differences between MSP430F1491IPMR and MSP430F149IPMR?

The MSP430F1491IPMR and MSP430F149IPMR differ only in flash memory content and bootloader configuration: MSP430F1491IPMR includes factory-programmed BSL and is qualified for full production use, while MSP430F149IPMR is a blank-programmable variant intended for custom firmware loading. Both share identical silicon, package, pinout, peripherals, and electrical specifications - making them functionally interchangeable once programmed.