Texas Instruments MSP430F1101AIDW

Overview

MSP430F1101AIDW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 1 KB flash memory, 128 B RAM, a 16-bit Timer_A with three capture/compare registers, on-chip analog comparator, and support for 1.8–3.6 V operation. It delivers 160 μA active current at 1 MHz/2.2 V and wakes from standby in <6 μs-ideal for battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F1101AIDW datasheet, MSP430F1101AIDW pinout, MSP430F1101AIDW application, or MSP430F1101AIDW equivalent, key selection factors include its 20-pin DW package, flash-based in-system programmability, integrated slope A/D capability via I/O pins, and five low-power modes optimized for energy-constrained embedded sensing.

Technical Context

The MSP430F1101AIDW implements a 16-bit 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 external resistor or resonator options-enabling sub-6-μs wake-up from LPM3/LPM4.

Peripheral integration includes two 8-bit I/O ports (14 total pins, with P2 limited to six external signals), a 16-bit Timer_A3 with three independent capture/compare registers, and Comparator_A supporting analog signal comparison and single-slope A/D conversion on resistive sensors-without requiring external ADC hardware.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Small-Outline Wide Body (SOWB), DW suffix - 7.5 mm × 12.8 mm, 1.27 mm pitch, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F1121AIDW and MSP430F2131IPW, the MSP430F1101AIDW provides optimal cost/power balance for minimal-footprint sensor controllers where 1 KB flash suffices and UART-only BSL meets update requirements-avoiding over-specification in resource-constrained deployments.

Availability

MSP430F1101AIDW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and smart utility meter sensors requiring stable component supply and long-term industrial availability.

Supply support for MSP430F1101AIDW 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 focused on analog, embedded processing, and connectivity technologies-with broad portfolio serving industrial, automotive, and consumer markets.

The MSP430x1xx family was designed specifically for ultralow-power sensing and measurement applications, emphasizing extended battery life, integrated analog peripherals, and robust operation across −40°C to 85°C industrial temperature range.

FAQ

What is the maximum operating frequency of the MSP430F1101AIDW at 3.6 V?

The MSP430F1101AIDW supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V, as specified in the recommended operating conditions. This applies when executing code from flash memory and using the internal DCO or external crystal/resonator sources. The device maintains full functionality-including Timer_A, Comparator_A, and I/O-across this frequency range, with active current scaling linearly per the datasheet's IAM = IAM[3 V] + 120 μA/V × (VCC−3 V) relationship.

Does the MSP430F1101AIDW support in-system programming without external hardware?

Yes, the MSP430F1101AIDW supports in-system programming via its integrated bootstrap loader (BSL), which operates over UART using P1.1 (TX) and P2.2 (RX). No external programming voltage or dedicated JTAG debugger is required-enabling field firmware updates with only a UART-to-USB adapter. The BSL is protected by a user-configurable password, and flash memory can also be programmed via JTAG for development and production programming.

How many I/O pins does the MSP430F1101AIDW expose in the DW package?

The MSP430F1101AIDW in the 20-pin DW package exposes 14 functional I/O pins: eight on Port 1 (P1.0–P1.7) and six on Port 2 (P2.0–P2.5). Although Port 2 has eight internal bits, only P2.0 through P2.5 are routed to external pins per the DW package pinout. All 14 pins support individual direction control, interrupt-on-change, and multiple peripheral functions including Timer_A capture/compare and Comparator_A inputs.

What low-power modes are available on the MSP430F1101AIDW, and what is the lowest current draw?

The MSP430F1101AIDW offers six operating modes: Active Mode and five low-power modes (LPM0–LPM4). The lowest current draw is achieved in LPM4 (off mode with RAM retention) at 0.1 μA typical at 2.2 V and 25°C. In this mode, all clocks-including ACLK-are disabled, the DCO is halted, and the crystal oscillator stops-while 128 B RAM remains powered and accessible upon wake-up via RST/NMI or port interrupt.

Can the MSP430F1101AIDW perform analog-to-digital conversion without an external ADC?

Yes, the MSP430F1101AIDW can perform analog-to-digital conversion using its integrated Comparator_A module in slope A/D configuration. By charging a capacitor through a resistive sensor and measuring the time required for the comparator output to toggle, the device converts analog resistance values (e.g., thermistors, photoresistors) into digital results using Timer_A-requiring no external ADC, op-amp, or precision reference. This technique is explicitly documented in the datasheet for I/O port inputs.