Texas Instruments MSP430F1111AIDW

Overview

MSP430F1111AIDW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 2KB flash + 256B information memory, 128B RAM, a 16-bit Timer_A with three capture/compare registers, an on-chip analog comparator, and 14 programmable I/O pins. It operates from 1.8 V to 3.6 V and supports wake-up from standby mode in under 6 μs - ideal for battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F1111AIDW datasheet, MSP430F1111AIDW pinout, MSP430F1111AIDW application, or MSP430F1111AIDW equivalent, key selection criteria include its 2KB flash capacity, DW-package 20-pin SOWB footprint, LPM4 current of 0.1 μA at 25°C, integrated comparator for slope A/D, and JTAG/BSL programmability without external voltage.

Technical Context

The MSP430F1111AIDW implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and selectable internal resistors - delivering sub-6-μs wake-up and flexible low-power clocking across six operating modes (AM, LPM0–LPM4).

Peripherals are memory-mapped and accessible via all instructions: Timer_A3 provides three independent capture/compare channels with interrupt capability; Comparator_A supports analog signal comparison and battery monitoring; and dual 8-bit ports (P1 with full 8-bit interrupt edge select, P2 with 6 external pins) enable configurable digital I/O and single-slope A/D on resistive sensors.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Small-Outline Wide Body (SOWB), DW suffix, 0.65 mm pitch, body size 7.5 mm × 12.8 mm. RoHS-compliant, surface-mount, with exposed thermal pad recommended to be connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F1111AIDW, MSP430F1121AIDW offers double flash and RAM in the same DW package for seamless scalability, while MSP430F1232IPW trades pin compatibility for integrated USART and faster CPU - making it suitable for more complex communication-centric designs.

Availability

MSP430F1111AIDW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and industrial equipment monitors requiring stable component supply, long-term lifecycle support, and verified RoHS compliance.

Supply support for MSP430F1111AIDW 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 MSP430x1xx family was engineered specifically for battery-operated measurement applications - prioritizing nanowatt sleep modes, fast wake-up, integrated analog peripherals, and robust flash reliability in harsh environments.

FAQ

What is the maximum operating frequency of the MSP430F1111AIDW at 3.6 V?

The MSP430F1111AIDW supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V, as specified in the recommended operating conditions. This applies when using the internal DCO or external crystal/resonator sources. At lower supply voltages (e.g., 1.8 V), the maximum frequency is reduced to 4.15 MHz to maintain timing margins and stability.

Does the MSP430F1111AIDW support in-system programming without external voltage?

Yes, the MSP430F1111AIDW supports in-system programming via its built-in bootstrap loader (BSL), which uses UART communication and requires no external programming voltage. The BSL is accessed through P1.1 (TX) and P2.2 (RX) pins, and firmware updates can be performed with only VCC, VSS, and the two UART lines - ideal for field upgrades in deployed devices.

How many I/O pins does the MSP430F1111AIDW provide, and what interrupt capabilities do they offer?

The MSP430F1111AIDW provides 14 usable I/O pins: eight on Port 1 (P1.0–P1.7) and six on Port 2 (P2.0–P2.5). All P1 pins and the six P2 pins support individually configurable interrupt edge select (rising/falling/both) and interrupt flag clearing in software - enabling reliable wake-up from LPM modes on external events such as button presses or sensor thresholds.

What is the role of the TEST pin on the MSP430F1111AIDW, and how should it be handled in production?

The TEST pin (Pin 1) selects JTAG test mode and connects to the JTAG fuse. During normal operation, it must be pulled high (typically via 10 kΩ to VCC); pulling it low enables BSL entry. In production, TEST should never float - unconnected or floating TEST pins risk unintended JTAG activation or BSL entry, potentially compromising security or causing startup failures.

Can the MSP430F1111AIDW's analog comparator be used for battery voltage monitoring?

Yes, the MSP430F1111AIDW's Comparator_A module supports battery voltage monitoring by comparing a scaled-down battery voltage (via resistor divider) against an internal reference or fixed voltage. Its hysteresis (0.3–1.1 V) suppresses noise-induced toggling, and interrupt generation on threshold crossing enables autonomous low-battery alerts without CPU intervention - preserving LPM4 current of 0.1 μA.