Texas Instruments MSP430F1121AIRGET

Overview

MSP430F1121AIRGET 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 I/O pins. It operates from 1.8 V to 3.6 V and achieves active-mode current of 160 μA at 1 MHz/2.2 V, enabling battery-powered sensor systems and RF front ends.

For engineers reviewing the MSP430F1121AIRGET datasheet, MSP430F1121AIRGET pinout, MSP430F1121AIRGET application, or MSP430F1121AIRGET equivalent, key selection criteria include its 20-pin QFN (RGE) package, LPM4 standby current of 0.1 μA, 6 μs wake-up time, integrated slope A/D capability via I/O ports, and JTAG + BSL programmability without external voltage.

Technical Context

The MSP430F1121AIRGET implements a 16-bit CPU with seven addressing modes and constant generators for high code efficiency. Its basic clock module supports multiple sources: internal DCO (stabilizes in <6 μs), 32-kHz crystal, high-frequency crystal, resonator, or external clock - enabling flexible low-power timing architectures.

It integrates Timer_A3 with three independent capture/compare registers, Comparator_A for analog signal comparison or slope A/D conversion, and two 8-bit I/O ports (P1: 8 pins; P2: 6 pins). All I/O bits support individually configurable direction, pull-up/down, and edge-selectable interrupts - critical for event-driven sensor interfaces.

Key Specifications

Pinout & Package

Package: 20-pin QFN (RGE), 4 mm × 4 mm, 0.5 mm pitch, exposed 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 MSP430F1101AIRGET, the MSP430F1121AIRGET doubles flash and RAM while retaining identical power, timing, and I/O characteristics - ideal for feature-rich sensor firmware. Against MSP430F1132AIRGET, it trades integrated ADC for lower cost and smaller die size where slope A/D suffices.

Availability

MSP430F1121AIRGET is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, and low-power industrial monitors requiring stable component supply across extended production lifecycles.

Supply support for MSP430F1121AIRGET 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 ultralow-power design.

The MSP430x1xx family was engineered specifically for portable measurement and battery-constrained applications, emphasizing rapid wake-up, multi-level power gating, and integrated analog functionality to minimize system component count.

FAQ

What is the maximum operating frequency of the MSP430F1121AIRGET at 3.6 V?

The MSP430F1121AIRGET 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. The internal DCO and clock module are calibrated to sustain stable operation at this rate under full voltage and temperature range (−40°C to 85°C), enabling deterministic real-time performance for time-critical sensor sampling or communication tasks. MSP430F1121AIRGET maintains full peripheral functionality-including Timer_A and Comparator_A-at this frequency.

Does the MSP430F1121AIRGET include a hardware ADC?

No, the MSP430F1121AIRGET does not integrate a dedicated analog-to-digital converter (ADC). Instead, it provides an analog comparator (Comparator_A) and supports single-slope A/D conversion using external RC networks and I/O pins - a technique documented in TI application reports for resource-constrained designs. This approach avoids ADC silicon area and power overhead while delivering usable resolution for slow-varying signals like temperature or battery voltage. MSP430F1121AIRGET relies on this comparator-based method rather than SAR or sigma-delta conversion.

What package type and pin count does the MSP430F1121AIRGET use?

The MSP430F1121AIRGET is packaged in a 20-pin QFN (RGE) variant: 4 mm × 4 mm body, 0.5 mm pitch, with an exposed thermal pad. This matches the "AIRGET" suffix per TI's packaging nomenclature. It is distinct from the 20-pin SOWB (DW), TSSOP (PW), or TVSOP (DGV) variants - the RGE package offers superior thermal performance and board-space efficiency for compact, battery-operated designs. MSP430F1121AIRGET's pinout is fully defined in the SLAS241I datasheet Figure 3 (RGE top view).

Can the MSP430F1121AIRGET be programmed in-system without a JTAG debugger?

Yes, the MSP430F1121AIRGET supports in-system programming via its built-in Bootstrap Loader (BSL), accessible through UART using pins P1.1 (TX) and P2.2 (RX). No external programming voltage is required - operation occurs within the standard 1.8–3.6 V supply range. The BSL is protected by a user-configurable password, and entry is triggered by specific pin states at power-up. This enables field firmware updates and manufacturing programming without dedicated JTAG hardware. MSP430F1121AIRGET retains full JTAG capability for development and debug when needed.

What is the wake-up time from LPM4 to active mode for the MSP430F1121AIRGET?

The MSP430F1121AIRGET wakes up from LPM4 (RAM retention, all clocks off) to active mode in less than 6 μs, as guaranteed across the full operating temperature and voltage range (−40°C to 85°C, 1.8–3.6 V). This specification is enabled by the internal digitally controlled oscillator (DCO), which stabilizes faster than crystal-based oscillators. The wake-up time includes oscillator stabilization, CPU restart, and execution resumption - critical for ultra-low-duty-cycle applications such as periodic sensor sampling. MSP430F1121AIRGET achieves this performance without external components or configuration overhead.