Texas Instruments MSP430F149CY

Overview

MSP430F149CY from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller with 60KB flash, 2KB RAM, dual USARTs, 12-bit ADC (8-channel), two 16-bit timers (Timer_A3 and Timer_B7), and integrated comparator. It operates from 1.8 V to 3.6 V and supports five power-saving modes - ideal for battery-powered sensor nodes and portable metering systems.

For engineers reviewing the MSP430F149CY datasheet, MSP430F149CY pinout, MSP430F149CY application, or MSP430F149CY equivalent, key selection considerations include its 64-pin LQFP package, 48 I/O pins with interrupt capability, <10 µs ADC conversion time, sub-6 µs wake-up from LPM3, and dual UART/SPI serial interfaces for industrial telemetry and energy monitoring designs.

Technical Context

The MSP430F149CY implements a 16-bit CPU with constant generators and hardware multiplier for optimized code efficiency. Its clock system integrates DCO, LFXT1 (32.768 kHz crystal), and XT2 (up to 8 MHz) oscillators, enabling flexible low-power timing across active and standby modes.

Peripherals are tightly coupled via shared bus architecture: ADC12 uses internal reference or external VeREF+, Timer_B7 provides seven capture/compare registers with shadow registers for glitch-free PWM, and both USART0/USART1 support full-duplex asynchronous UART or synchronous SPI operation with independent clock domains.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (CY suffix per TI nomenclature denotes LQFP-64, 10 mm × 10 mm, exposed thermal pad). Pin count and mechanical dimensions match TI's standard PM package variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F149IPM (identical functionality, alternate package code) and MSP430F1491IRTD (same silicon, smaller VQFN), the MSP430F149CY offers standardized LQFP-64 mechanical compatibility and proven manufacturability in high-volume metering and industrial assemblies.

Availability

MSP430F149CY is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor nodes, portable handheld testers, and low-power data loggers requiring stable component supply and long-term lifecycle assurance.

Supply support for MSP430F149CY 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 emphasis on reliability, longevity, and industrial-grade qualification.

The MSP430F149CY belongs to the MSP430F14x ultra-low-power MCU family, designed specifically for battery-operated measurement and control applications demanding extended runtime, high analog integration, and robust firmware security.

FAQ

What is the maximum operating frequency of the MSP430F149CY?

The MSP430F149CY does not have a fixed maximum clock frequency specification; its DCO can be calibrated up to approximately 8 MHz using the internal calibration constants or external crystals (XT2 up to 8 MHz). Actual system clock (MCLK) is software-configurable and typically limited by supply voltage and temperature - at 3.3 V and 25°C, stable operation exceeds 7.5 MHz. The MSP430F149CY achieves 125-ns instruction cycle time at 8 MHz.

Does the MSP430F149CY support hardware UART and SPI simultaneously on both USART modules?

Yes. The MSP430F149CY contains two independent USART peripherals (USART0 and USART1), each configurable as either asynchronous UART or synchronous SPI. Both can operate concurrently - for example, USART0 as UART for sensor telemetry and USART1 as SPI for flash memory or display interface - with separate clock sources and interrupt vectors. This capability is confirmed in the device comparison table and functional block diagram for MSP430F14x devices.

What ADC reference options are available on the MSP430F149CY?

The MSP430F149CY ADC12 supports three reference configurations: internal 1.5 V or 2.5 V bandgap reference (selectable via REFCTL0 register), external reference applied to VeREF+ (Pin 10) with VREF−/VeREF− (Pin 11) as common, or AVCC as reference. Internal references are factory-trimmed and stable over temperature; external reference mode allows higher precision or custom voltage scaling. All options are documented in Section 5.23–5.25 of the SLAS272H datasheet.

Is the MSP430F149CY pin-compatible with other MSP430F14x variants like the MSP430F148 or MSP430F147?

Yes - all MSP430F14x devices (including MSP430F149CY, MSP430F148, MSP430F147) share identical 64-pin LQFP/PAG/RTD packages and fully compatible pinouts per Figure 4-2 and Table 4-1. Differences are limited to flash/RAM size and peripheral enablement (e.g., all have Timer_B7 and dual USARTs), so hardware designs can scale firmware capacity without PCB revision. The MSP430F149CY pinout matches MSP430F148IPM and MSP430F147IPM exactly.

How is code protection implemented on the MSP430F149CY?

Code protection on the MSP430F149CY is enforced via a one-time-programmable JTAG fuse (Section 5.31). When blown, it disables JTAG access and prevents reading flash contents or performing mass erase. The fuse is independent of the BSL (bootloader) lock bits; BSL remains accessible unless separately disabled via BSL password protection. This dual-layer security - fuse + BSL lock - is explicitly defined in the SLAS272H datasheet and applies identically to all MSP430F14x devices including the MSP430F149CY.