Texas Instruments MSP430F1121IPW

Overview

MSP430F1121IPW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 4KB flash memory, 256B 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 MSP430F1121IPW datasheet, MSP430F1121IPW pinout, MSP430F1121IPW application, or MSP430F1121IPW equivalent, key selection criteria include its 20-pin TSSOP (PW) package, flash-based in-system programmability, integrated slope A/D capability via comparator, and support for multiple clock sources including 32-kHz crystal and internal DCO.

Technical Context

The MSP430F1121IPW 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), LFXT1 oscillator for 32-kHz crystals, and configurable SMCLK/ACLK/MCLK domains.

It features five software-selectable low-power modes (LPM0–LPM4), with LPM4 consuming only 0.1 μA at 2.2 V. The analog comparator supports precision slope A/D conversion and battery voltage supervision, while Timer_A3 provides PWM, capture, and interval timing with interrupt capability on overflow and each CCR.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), 4.4 mm × 6.5 mm, 0.65 mm pitch, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F1101IPW, the MSP430F1121IPW offers 4× more flash for complex sensor fusion algorithms; compared with MSP430F1132IPW, it lacks SAR ADC but maintains identical power profile and lower cost for comparator-based A/D applications.

Availability

MSP430F1121IPW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and industrial battery monitors requiring stable component supply across extended product lifecycles.

Supply support for MSP430F1121IPW 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 MSP430x11x1(A) product line was designed specifically for ultralow-power portable measurement and sensing applications where battery life, integration density, and system-level power management are critical.

FAQ

What is the maximum operating frequency of the MSP430F1121IPW at 3.6 V?

The MSP430F1121IPW supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V. This is achieved using the internal DCO or external crystal/resonator sources. The device's 125 ns instruction cycle time corresponds to this 8 MHz clock, enabling real-time processing of sensor data and communication protocols without external acceleration.

Does the MSP430F1121IPW support in-system programming without a JTAG debugger?

Yes, the MSP430F1121IPW includes a factory-programmed bootstrap loader (BSL) that enables in-system flash programming via UART using only P1.1 (TX) and P2.2 (RX). No external programming voltage or JTAG interface is required, allowing firmware updates directly through a host MCU or PC serial port - a key advantage for field-deployed devices.

How many I/O pins does the MSP430F1121IPW provide, and which are interrupt-capable?

The MSP430F1121IPW provides 14 usable I/O pins: eight on Port 1 (P1.0–P1.7) and six on Port 2 (P2.0–P2.5). All 14 pins support individually configurable interrupt-on-edge (rising/falling), and each port has dedicated interrupt flag, enable, and edge-select registers - enabling robust wake-up from any pin state change in low-power modes.

What clock sources are supported by the MSP430F1121IPW basic clock module?

The MSP430F1121IPW basic clock module supports multiple clock sources: internal DCO (calibrated to ~1 MHz), external 32.768 kHz watch crystal (LFXT1), ceramic resonator (450 kHz–8 MHz), high-frequency crystal (up to 8 MHz), and external clock input. These feed ACLK, SMCLK, and MCLK domains, allowing flexible trade-offs between accuracy, startup time, and power consumption.

Is the MSP430F1121IPW pin-compatible with other members of the MSP430F11x1A family?

Yes, all MSP430F11x1A variants in the 20-pin TSSOP (PW) package - including MSP430F1101AIPW, MSP430F1111AIPW, and MSP430F1121AIPW - share identical pinouts and electrical characteristics. Firmware and PCB layouts are interchangeable across these parts, enabling scalable memory selection without hardware redesign.