Texas Instruments MSP430F1121AIRGER

Overview

MSP430F1121AIRGER 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 MSP430F1121AIRGER datasheet, MSP430F1121AIRGER pinout, MSP430F1121AIRGER application, or MSP430F1121AIRGER equivalent, key selection criteria include its 20-pin QFN (RGE) package, flash-based in-system programmability, integrated slope A/D capability via comparator, low-power operating modes (LPM0–LPM4), and JTAG/BSL programming support.

Technical Context

The MSP430F1121AIRGER implements a 16-bit CPU with seven addressing modes and constant generators for high code efficiency. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and selectable external resistor or resonator configurations - enabling sub-6-μs wake-up from LPM3/LPM4.

Peripherals include two 8-bit I/O ports (P1 with 8 pins, P2 with 6 exposed pins), Timer_A3 with three independent capture/compare channels, Comparator_A with CA0/CA1 inputs and CAOUT output, and watchdog timer configurable as interval timer. All peripherals are memory-mapped and accessible via standard instructions.

Key Specifications

Pinout & Package

Package: 20-pin QFN (RGE), 4 mm × 4 mm, 0.5 mm pitch, thermal pad (recommended connection to VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F1101AIRGER, the MSP430F1121AIRGER doubles flash and RAM while retaining identical power behavior and pinout; versus MSP430F1132AIRGER, it trades ADC resolution for lower cost and smaller die size where slope A/D suffices.

Availability

MSP430F1121AIRGER is available at Aetrix Electronics and suitable for wireless sensor nodes, battery supervision systems, and portable metering instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and voltage ranges.

Supply support for MSP430F1121AIRGER 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 energy efficiency, reliability, and system-level integration.

The MSP430x11x1A product line was designed specifically for ultralow-power portable measurement and sensing applications - prioritizing sub-μA standby, fast wake-up, integrated analog functions, and flash-based field programmability.

FAQ

What is the maximum operating frequency of the MSP430F1121AIRGER at 3.6 V?

The MSP430F1121AIRGER achieves 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 sources. The 16-bit RISC core delivers one instruction per cycle, enabling deterministic real-time response up to this rate.

Does the MSP430F1121AIRGER support in-system programming without external hardware?

Yes, the MSP430F1121AIRGER supports in-system programming via its built-in bootstrap loader (BSL), which operates over UART using P1.1 (TX) and P2.2 (RX). No external programmer is required - only a UART-to-USB bridge and TI-provided BSL host software are needed to reprogram flash memory in the field or during production.

How many I/O pins does the MSP430F1121AIRGER expose in the RGE package?

The MSP430F1121AIRGER in the 20-pin QFN (RGE) package exposes 14 dedicated I/O pins: Port 1 (P1.0–P1.7) provides eight pins, and Port 2 (P2.0–P2.5) provides six pins. All 14 pins are individually configurable as digital inputs/outputs with interrupt capability, and multiple pins share alternate functions including Timer_A, comparator, and JTAG signals.

What low-power modes are available on the MSP430F1121AIRGER, and what is the lowest current draw?

The MSP430F1121AIRGER supports five software-selectable low-power modes (LPM0–LPM4). The lowest active-current state is LPM4 (CPU, MCLK, SMCLK, and ACLK all disabled), drawing 0.1 μA at 25°C and 2.2 V - with RAM retention enabled. This mode stops the crystal oscillator and disables the DCO's DC generator, making it optimal for long-duration sleep between infrequent wake events.

Is the MSP430F1121AIRGER pin-compatible with other devices in the MSP430F11x1A family?

Yes, the MSP430F1121AIRGER is fully pin-compatible with other RGE-package variants in the MSP430F11x1A family, including MSP430F1101AIRGER and MSP430F1111AIRGER. All share identical 20-pin QFN footprints, pin assignments, and electrical characteristics - enabling drop-in replacement within the same package variant for memory-scaling design iterations.