Texas Instruments MSP430F1101IDWR

Overview

MSP430F1101IDWR from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 1KB flash memory, 128B RAM, a 16-bit Timer_A with three capture/compare registers, an on-chip analog comparator, and fourteen I/O pins. It operates from 1.8 V to 3.6 V, achieves 160 μA active current at 1 MHz/2.2 V, and wakes from standby in under 6 μs - enabling battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F1101IDWR datasheet, MSP430F1101IDWR pinout, MSP430F1101IDWR application, or MSP430F1101IDWR equivalent, key selection criteria include its 20-pin DW (SOWB) package, flash-based programmability without external voltage, integrated slope A/D capability via I/O pins, and LPM4 current of 0.1 μA at 25°C for multi-year coin-cell operation.

Technical Context

The MSP430F1101IDWR implements a 16-bit CPU with seven addressing modes and constant generators for high code efficiency, executing register-to-register operations in one CPU cycle. Its basic clock module supports multiple sources: internal DCO (stabilizes <6 μs), 32-kHz crystal, high-frequency crystal, resonator, or external clock - all selectable via BCSCTL1/BCSCTL2 registers.

It integrates Timer_A3 with three independent capture/compare registers (TACCR0–TACCR2), supporting PWM generation, interval timing, and input capture with interrupt capability per channel. The analog comparator enables battery voltage supervision and single-slope A/D conversion on resistive sensors using P2.3/CA0 and P2.4/CA1 inputs.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Small-Outline Wide Body (SOWB), DW suffix, body width 7.5 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F1121IDWR, the MSP430F1101IDWR trades memory capacity for cost-sensitive volume production; versus MSP430G2553IPW20, it offers superior ultra-low-power sleep current and pinout compatibility with legacy SOWB layouts - critical for drop-in replacements in existing designs.

Availability

MSP430F1101IDWR is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, and portable medical devices requiring stable component supply across multi-year production cycles.

Supply support for MSP430F1101IDWR 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 microcontroller innovation.

The MSP430x1xx family was designed specifically for ultralow-power portable measurement and sensing applications - prioritizing nanowatt sleep modes, fast wake-up, and integrated analog functionality over raw compute performance.

FAQ

What is the maximum operating frequency of the MSP430F1101IDWR?

The MSP430F1101IDWR supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V and 4.15 MHz at 1.8 V, as specified in the recommended operating conditions. This frequency is derived from the digitally controlled oscillator (DCO) or external crystal/resonator sources. The actual achievable frequency depends on supply voltage and clock source configuration - for example, Timer_A external clock input (TACLK) accepts up to 10 MHz, but the CPU itself runs at MCLK-limited speed. MSP430F1101IDWR firmware must configure BCSCTL1 and DCOCTL registers to calibrate and stabilize the DCO for consistent timing.

Does the MSP430F1101IDWR support in-system programming without external hardware?

Yes, the MSP430F1101IDWR supports in-system programming via its built-in bootstrap loader (BSL), which uses UART communication over P1.1 (TX) and P2.2 (RX) pins. No external programming voltage or JTAG debugger is required for field firmware updates. The BSL is protected by a user-defined password stored in information memory, and entry is triggered by holding the TEST pin low during reset. MSP430F1101IDWR's flash memory can also be programmed via JTAG using standard tools like MSP-FET, but BSL enables true tool-less updates in deployed units.

What are the absolute maximum ratings for the MSP430F1101IDWR supply voltage?

The absolute maximum supply voltage rating for the MSP430F1101IDWR is −0.3 V to 4.1 V applied between VCC and VSS. Exceeding this range may cause permanent damage. The recommended operating supply voltage is strictly 1.8 V to 3.6 V for program execution, and 2.7 V to 3.6 V is required specifically for flash memory programming or erase operations. All I/O pins tolerate voltages from −0.3 V to VCC+0.3 V, but sustained operation outside the recommended range risks parametric degradation or latch-up. MSP430F1101IDWR reliability depends on maintaining VCC within these bounds during all operational phases.

How many I/O pins does the MSP430F1101IDWR provide, and what are their capabilities?

The MSP430F1101IDWR provides 14 usable digital I/O pins: eight on Port 1 (P1.0–P1.7) and six on Port 2 (P2.0–P2.5). Each pin is individually configurable for input/output direction, pull-up/pull-down resistors, and edge-selectable interrupts (rising/falling). All P1 pins and P2.0–P2.5 support interrupt generation, and multiple pins share alternate functions such as Timer_A channels, comparator inputs/outputs, and JTAG signals. MSP430F1101IDWR does not implement P2.6 or P2.7 externally - only six P2 bits are routed to package pins, though full port register width is maintained in software.

Can the MSP430F1101IDWR perform analog-to-digital conversion without an external ADC?

Yes, the MSP430F1101IDWR supports single-slope analog-to-digital conversion using its integrated Comparator_A module and Timer_A. By configuring P2.3/CA0 and P2.4/CA1 as comparator inputs and driving a known ramp voltage into CA0, the comparator output toggles when the input crosses the reference - the Timer_A capture register records the time difference, yielding a digital value proportional to the analog input. This technique eliminates need for external ADC components in low-resolution (<10-bit) sensing applications. MSP430F1101IDWR's datasheet confirms this method is supported and commonly used for resistive sensor interfaces.