Texas Instruments MSP430G2432IN20

Overview

MSP430G2432IN20 from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller in 20-pin PDIP packaging, featuring 16 KB flash, 256 B RAM, 10-bit 200-ksps ADC with internal reference and autoscan, USI supporting SPI/I²C, Timer_A with three capture/compare registers, and capacitive-touch I/O capability - deployed in battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2432IN20 datasheet, MSP430G2432IN20 pinout, MSP430G2432IN20 application, or MSP430G2432IN20 equivalent, key selection considerations include its 1.8–3.6 V supply range, sub-1 µs wake-up from LPM4, integrated brownout detection, Spy-Bi-Wire debug interface, and ADC10 channel count versus power-mode tradeoffs in energy-constrained designs.

Technical Context

The MSP430G2432IN20 implements a 16-bit CPU with seven addressing modes and 51-instruction set, paired with a digitally controlled oscillator (DCO) calibrated at 1/8/12/16 MHz for rapid active-mode entry. Its clock system delivers ACLK (LF oscillator or 32-kHz crystal), SMCLK (DCO-derived), and MCLK (system clock) with independent gating per low-power mode.

Peripherals are memory-mapped and accessible via all CPU instructions: ADC10 uses DMA-assisted autoscan across eight analog inputs (A0–A7); USI supports master/slave SPI and I²C with programmable clock polarity/phase; Timer_A3 provides PWM, input capture, and interval timing with interrupt-capable CCR0/CCR1/CCR2 registers and TAIV vectoring.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Dual In-line Package (PDIP), 0.300-inch width, through-hole mounting compatible with standard DIP sockets and wave soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2432IN20, the MSP430G2553IPW20 offers greater memory headroom and peripheral depth at the cost of higher active current, while the MSP430FR2433IPW20 replaces flash endurance limitations with FRAM's infinite write cycles and deterministic execution - both require PCB layout revision due to different package types and voltage regulator requirements.

Availability

MSP430G2432IN20 is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical monitors, and industrial control panels requiring stable component supply, long-term obsolescence management, and traceable sourcing for production ramp.

Supply support for MSP430G2432IN20 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 for industrial, automotive, and consumer markets.

The MSP430G2xx family targets ultra-low-power embedded applications - designed specifically for battery-operated sensor systems, portable instrumentation, and energy-harvesting devices where nanowatt operation and fast wake-up are essential.

FAQ

What is the maximum ADC10 sampling rate supported by the MSP430G2432IN20?

The MSP430G2432IN20 supports a maximum ADC10 sampling rate of 200 ksamples per second (ksps) when using the internal oscillator or an external clock source up to 5 MHz. This rate assumes optimal configuration - including ADC10SHTx settings, reference stability, and minimal conversion overhead - and is validated under typical operating conditions (2.2 V, 25°C). The MSP430G2432IN20 achieves this performance using its integrated sample-and-hold and autoscan features without CPU intervention.

Does the MSP430G2432IN20 support hardware UART functionality?

No, the MSP430G2432IN20 does not include a dedicated UART peripheral. It features a Universal Serial Interface (USI) module that supports SPI and I²C protocols only. UART functionality must be implemented in software using Timer_A outputs and GPIO pins - commonly referred to as "bit-banged UART" - which consumes CPU cycles and increases timing sensitivity. For native UART, consider the MSP430G2553IN20 or later FRAM-based variants.

What debug interface does the MSP430G2432IN20 use, and what pins are required?

The MSP430G2432IN20 uses the Spy-Bi-Wire (SBW) debug interface, requiring only two pins: RST/NMI/SBWTDIO (Pin 10) and TEST/SBWTCK (Pin 11). This two-wire interface supports full in-circuit emulation, flash programming, and real-time breakpoint debugging - eliminating the need for a four-wire JTAG header. SBW is enabled by default after reset and remains functional even in LPM4, allowing wake-up and debug initiation without external reset assertion.

Can the MSP430G2432IN20 operate without an external crystal?

Yes, the MSP430G2432IN20 can operate without an external crystal. Its digitally controlled oscillator (DCO) provides factory-calibrated frequencies of 1, 8, 12, and 16 MHz - sufficient for most timing-critical functions including USI communication, Timer_A PWM, and ADC sampling clocks. The 32-kHz crystal input (XIN/XOUT) is optional and used only when precise low-frequency timing (e.g., real-time clock) or improved DCO stability is required. Internal LF oscillator is always available for ACLK.

What is the function of the P2.0–P2.5 pins on the MSP430G2432IN20?

Pins P2.0 through P2.5 on the MSP430G2432IN20 are general-purpose digital I/O pins with individually configurable direction, pullup/pulldown resistors (enabled via P2REN.x), interrupt capability (edge-selectable via P2IES.x), and interrupt flag status (P2IFG.x). Unlike Port 1, these pins do not support analog functions or USI/Timer_A alternate functions - they serve exclusively as robust digital I/O for LEDs, buttons, relay drivers, or discrete sensor interfaces in space-constrained PDIP layouts.