Texas Instruments MSP430G2101IRSA16R

Overview

MSP430G2101IRSA16R from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller with 1 kB flash, 128 B RAM, and a 16-bit Timer_A2 featuring two capture/compare registers. It operates from 1.8 V to 3.6 V, achieves active-mode current of 220 µA at 1 MHz/2.2 V, and supports five low-power modes including LPM4 (0.1 µA RAM retention). It targets battery-powered sensor nodes requiring precise timing, analog monitoring, and minimal energy consumption.

For engineers reviewing the MSP430G2101IRSA16R datasheet, MSP430G2101IRSA16R pinout, MSP430G2101IRSA16R application, or MSP430G2101IRSA16R equivalent, key selection criteria include its QFN-16 package footprint, absence of integrated comparator (distinguishing it from G2x11 variants), verified 16-MHz DCO capability at ≥3.3 V, and Spy-Bi-Wire debug interface compatibility.

Technical Context

The MSP430G2101IRSA16R implements a 16-bit CPU with seven addressing modes and 51-instruction RISC ISA, executing register-to-register operations in one MCLK cycle. Its clock system integrates a digitally controlled oscillator (DCO) calibrated for 1 MHz, 8 MHz, 12 MHz, and 16 MHz operation, plus internal LF and external 32-kHz crystal support.

It features a single 8-bit I/O port (P1) with individually configurable pullup/pulldown resistors and edge-selectable interrupts on all eight pins, plus two P2 I/O bits. The Timer_A2 module provides interval timing, PWM generation, and input capture using two compare/capture registers-TA0 and TA1-with interrupt capability on overflow and each CCR.

Key Specifications

Pinout & Package

Package: 16-pin QFN (RSA), 3 mm × 3 mm, 0.4 mm pitch, exposed thermal pad recommended to be connected to DVSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2201IRSA16 and MSP430FR2111IRSA16, the MSP430G2101IRSA16 offers the lowest entry cost and smallest memory footprint for simple polling-based sensor tasks, while retaining identical ultra-low-power behavior and debug interface compatibility.

Availability

MSP430G2101IRSA16R is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical patches, and energy-harvesting transmitters requiring stable component supply across long-lifecycle industrial and consumer programs.

Supply support for MSP430G2101IRSA16R 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 leadership in ultralow-power microcontrollers.

The MSP430G2xx series was designed specifically for cost-sensitive, battery-operated measurement applications demanding nanowatt-level standby power and rapid wake-up response-enabling multi-year operation in compact form factors.

FAQ

What is the maximum operating frequency of the MSP430G2101IRSA16R?

The MSP430G2101IRSA16R supports a maximum MCLK frequency of 16 MHz when VCC ≥ 3.3 V and duty cycle is 50% ± 10%. At lower supply voltages, the maximum frequency is reduced: 12 MHz at 2.7 V and 6 MHz at 1.8 V. This is enforced by the DCO calibration and internal timing constraints, not user-configurable beyond factory-trimmed settings.

Does the MSP430G2101IRSA16R include an analog comparator?

No, the MSP430G2101IRSA16R does not include the Comparator_A+ module. It belongs to the G2x01 family, which omits the comparator present in G2x11 variants like MSP430G2111IRSA16. This distinction is confirmed in Table 1 of the SLAS695I datasheet, where Comp_A+ column shows "–" for all G2x01 devices including MSP430G2101IRSA16R.

What debug interface does the MSP430G2101IRSA16R support?

The MSP430G2101IRSA16R supports the two-wire Spy-Bi-Wire (SBW) interface using pins RST/NMI/SBWTDIO (Pin 9) and TEST/SBWTCK (Pin 11). It does not support full 4-wire JTAG. SBW enables programming, debugging, and real-time emulation with TI's MSP-FET and compatible tools, requiring only two PCB traces and no additional level-shifting circuitry.

What are the low-power mode current specifications for the MSP430G2101IRSA16R?

At 2.2 V and 25°C, the MSP430G2101IRSA16R draws 0.1 µA in LPM4 (RAM retention only), 0.7 µA in LPM3 with LFXT1 (32-kHz crystal), 0.5 µA in LPM3 with internal VLO, 22 µA in LPM2, and 65 µA in LPM0. These values are measured excluding external current and are specified in the SLAS695I Electrical Characteristics table under "Low-Power Mode Supply Currents".

Is the MSP430G2101IRSA16R pin-compatible with other MSP430G2xx QFN-16 devices?

Yes, the MSP430G2101IRSA16R shares identical pinout and package dimensions (RSA) with MSP430G2201IRSA16, MSP430G2111IRSA16, and MSP430G2211IRSA16. All use the same 16-pin QFN layout with DVCC/DVSS on opposite corners and Spy-Bi-Wire signals on Pins 9 and 11-enabling direct PCB footprint reuse across the G2xx RSA family.