Texas Instruments MSP430G2221IPW14R

Overview

MSP430G2221IPW14R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 2 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 delivers active-mode current of 220 µA at 1 MHz/2.2 V - optimized for battery-powered sensor nodes and portable instrumentation.

For engineers reviewing the MSP430G2221IPW14R datasheet, MSP430G2221IPW14R pinout, MSP430G2221IPW14R application, or MSP430G2221IPW14R equivalent, this device supports Spy-Bi-Wire debugging, USI-based SPI/I²C communication, and 10-bit ADC functionality (in G2x31 variants only - excluded in G2221), making it suitable for low-cost embedded control where power efficiency and minimal external components are critical.

Technical Context

The MSP430G2221IPW14R implements a 16-bit RISC CPU with constant generators and 16 general-purpose registers, enabling single-cycle execution for register operations. Its clock system integrates a digitally controlled oscillator (DCO) calibrated to 1 MHz, internal low-frequency oscillator (VLO), and optional 32-kHz crystal support - enabling sub-1-µs wake-up from LPM4 standby mode.

It features one 8-bit I/O port (P1) and two additional I/O bits on P2, all with individually programmable pull-up/down resistors and edge-selectable interrupts. The USI module provides hardware-level SPI and I²C protocol support without CPU overhead, while Timer_A2 enables PWM generation, input capture, and interval timing with dual compare registers.

Key Specifications

Pinout & Package

Package: 14-pin TSSOP (PW), 5.0 mm × 4.4 mm, 0.65 mm pitch, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2231IPW14R, the MSP430G2221IPW14R omits ADC10 but retains identical power profile, timer, and USI capabilities - making it ideal for pure digital control. Against MSP430FR2111IPW16R, it trades FRAM durability and UART support for lower unit cost and proven flash reliability in static firmware deployments.

Availability

MSP430G2221IPW14R is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meter interfaces, and industrial condition monitors requiring stable component supply across long-lifecycle designs.

Supply support for MSP430G2221IPW14R 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 over 50 years of microcontroller innovation.

The MSP430G2xx family targets ultra-low-power embedded applications - designed specifically for battery-operated sensing, measurement, and control systems where energy efficiency and integration outweigh raw performance.

FAQ

What is the maximum operating frequency of the MSP430G2221IPW14R?

The MSP430G2221IPW14R 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. Its factory-calibrated DCO is tuned to 1 MHz by default, but software can adjust it across the full range using CALDCO and CALBC1 values stored in information memory segment A.

Does the MSP430G2221IPW14R include an analog-to-digital converter (ADC)?

No, the MSP430G2221IPW14R does not include an ADC. It belongs to the G2x21 series, which omits the ADC10 module present in the G2x31 series (e.g., MSP430G2231IPW14R). All 10 I/O pins are digital-only, with no analog input capability - confirmed in Table 1 and functional block diagrams of the SLAS694J datasheet.

What debug interface does the MSP430G2221IPW14R support?

The MSP430G2221IPW14R supports Spy-Bi-Wire (SBW), a 2-wire variant of JTAG implemented via RST/NMI/SBWTDIO and TEST/SBWTCK pins. This interface enables full in-system programming, real-time debugging, and flash security fuse configuration without requiring a 4-pin JTAG header.

Can the MSP430G2221IPW14R drive an external 32-kHz crystal?

Yes, the MSP430G2221IPW14R supports external 32-kHz crystal operation via XIN (pin 13) and XOUT (pin 12). The basic clock module configures the crystal oscillator using BCSCTL3 register settings, and the resulting ACLK is used for low-power timing, RTC functions, and LPM3 operation.

How many I/O pins does the MSP430G2221IPW14R provide?

The MSP430G2221IPW14R provides 10 usable I/O pins: eight bits on Port 1 (P1.0–P1.7) and two bits on Port 2 (P2.6 and P2.7). All pins support individual direction control, pull-up/pull-down resistor enable, and edge-selectable interrupts - verified in Table 2 and pinout diagrams of SLAS694J.