Texas Instruments MSP430G2121IN14

Overview

MSP430G2121IN14 from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller in 14-pin PDIP packaging, featuring 1 kB flash, 128 B RAM, a 16-bit Timer_A with two capture/compare registers, brownout detection, and five power-saving modes. It operates from 1.8 V to 3.6 V and supports SPI/I²C via its USI module - ideal for battery-powered sensor nodes requiring fast wake-up (<1 µs) and minimal active current (220 µA at 1 MHz, 2.2 V).

For engineers reviewing the MSP430G2121IN14 datasheet, MSP430G2121IN14 pinout, MSP430G2121IN14 application, or MSP430G2121IN14 equivalent, this page delivers verified technical context, exact pin functions, low-power operating mode trade-offs, and validated alternative options for cost-optimized embedded designs targeting industrial sensing, portable instrumentation, and energy-harvesting systems.

Technical Context

The MSP430G2121IN14 implements a 16-bit CPU with constant generators and seven addressing modes, executing register-to-register instructions in one MCLK cycle. Its clock system integrates a digitally controlled oscillator (DCO), internal low-frequency oscillator (VLO), and external crystal support (32 kHz) - enabling flexible clock sourcing for ACLK, SMCLK, and MCLK domains.

It includes a single 8-bit I/O port (P1) and two P2 pins, all with individually configurable direction, pull-up/down resistors, and edge-selectable interrupts. The USI module provides hardware-level SPI and I²C protocol handling without CPU intervention, while Timer_A2 supports PWM generation, input capture, and interval timing with dual compare registers.

Key Specifications

Pinout & Package

Package: 14-pin Plastic Dual Inline Package (PDIP), N suffix per TI ordering nomenclature. Body width 0.300", lead pitch 0.100". RoHS-compliant, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2221IN14, the MSP430G2121IN14 trades ADC capability for lower cost and smaller code footprint; compared with MSP430G2111IN14, it adds essential USI hardware to reduce firmware complexity and improve communication reliability in sensor networks.

Availability

MSP430G2121IN14 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable data loggers, and energy-harvesting remote switches requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across temperature ranges.

Supply support for MSP430G2121IN14 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 ultra-low-power design and industrial-grade reliability.

The MSP430G2xx family targets cost-sensitive, battery-operated embedded applications demanding extended runtime, robust operation across –40°C to 85°C, and minimal external components - exemplified by the MSP430G2121IN14's integration of DCO, USI, and brownout protection in a PDIP package.

FAQ

What is the maximum operating frequency of the MSP430G2121IN14?

The MSP430G2121IN14 supports a maximum MCLK frequency of 16 MHz at VCC ≥ 3.3 V, 12 MHz at VCC ≥ 2.7 V, and 6 MHz at VCC = 1.8 V. This is governed by the DCO calibration data stored in Flash Information Memory Segment A, and actual achievable frequency depends on supply voltage and temperature. The MSP430G2121IN14 does not include an ADC10 module, so its clocking constraints are not affected by ADC sampling requirements.

Does the MSP430G2121IN14 support hardware ADC functionality?

No, the MSP430G2121IN14 does not include an ADC10 module. Per Table 1 in the SLAS694J datasheet, ADC10 channel count is listed as "–" for all MSP430G21xx devices, confirming absence of integrated analog-to-digital conversion. Analog signal acquisition requires external ADC or selection of MSP430G22xx/G23xx variants such as MSP430G2221IN14.

What debug interface does the MSP430G2121IN14 use?

The MSP430G2121IN14 uses the Spy-Bi-Wire (SBW) interface for programming and debugging, implemented on pins RST/NMI/SBWTDIO (Pin 10) and TEST/SBWTCK (Pin 11). This two-wire interface replaces full JTAG, reducing PCB routing complexity while supporting flash programming, breakpoint setting, and real-time register inspection during development.

Can the MSP430G2121IN14 operate from a 1.8 V supply?

Yes, the MSP430G2121IN14 is fully specified for operation from 1.8 V to 3.6 V. At 1.8 V, its maximum supported MCLK frequency is 6 MHz with 50% ±10% duty cycle, and active-mode current is characterized at 220 µA (typical) when running at 1 MHz. Brownout detection remains functional across the entire supply range.

Is the MSP430G2121IN14 pin-compatible with other MSP430G2xx devices in PDIP packaging?

Yes, the MSP430G2121IN14 shares identical 14-pin PDIP (N) mechanical dimensions and pin mapping with MSP430G2221IN14, MSP430G2111IN14, and MSP430G2211IN14. All share the same DVCC/DVSS placement, RST/TEST pin locations, XIN/XOUT pairing, and P1.x I/O layout - enabling drop-in replacement where peripheral requirements align.