Texas Instruments MSP430G2332IN20

Overview

MSP430G2332IN20 from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller in 20-pin PDIP package, featuring 8 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 MSP430G2332IN20 datasheet, MSP430G2332IN20 pinout, MSP430G2332IN20 application, or MSP430G2332IN20 equivalent, key selection criteria 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 budget trade-offs in embedded sensing designs.

Technical Context

The MSP430G2332IN20 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 fast wake-up. Its clock system delivers ACLK, SMCLK, and MCLK from LF oscillator, 32-kHz crystal, or DCO sources.

Peripherals include a 10-bit SAR ADC with sample-and-hold, internal 1.5 V/2.5 V reference, and eight analog input channels (A0–A7); USI module configurable for synchronous SPI or I²C; and Timer_A3 with three CC registers supporting PWM, capture, and interval timing - all accessible via memory-mapped registers and interrupt-driven operation.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Dual In-line Package (PDIP), 0.3 inch body width, through-hole mounting compatible with legacy prototyping and industrial PCB assembly.

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 MSP430G2332IN20 offers optimal cost/power balance for fixed-function sensor nodes; compared with MSP430G2333IN20, it prioritizes analog digitization over comparator logic - making it the preferred choice where 10-bit multi-channel ADC is mandatory.

Availability

MSP430G2332IN20 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart home touch interfaces, and energy metering subsystems requiring stable component supply and long-term manufacturability.

Supply support for MSP430G2332IN20 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 was engineered for cost-sensitive, battery-operated measurement and control applications - delivering optimized power/performance trade-offs for sensor fusion, capacitive touch, and simple automation tasks.

FAQ

What is the maximum ADC sampling rate supported by the MSP430G2332IN20?

The MSP430G2332IN20 supports a maximum ADC10 sampling rate of 200 ksps (kilo-samples per second) in fast conversion mode. This performance is achieved using the internal oscillator or external clock source, and is sustained across all eight analog input channels when configured in autoscan mode - enabling high-fidelity waveform capture for applications like energy monitoring and biomedical signal acquisition. The MSP430G2332IN20's ADC10 module includes sample-and-hold and internal reference to maintain accuracy without external components.

Does the MSP430G2332IN20 support hardware debug interfaces, and which ones?

Yes, the MSP430G2332IN20 integrates Spy-Bi-Wire (SBW) debug support via pins RST/NMI/SBWTDIO (Pin 16) and TEST/SBWTCK (Pin 17). This two-wire interface provides full in-system programming, breakpoint setting, register inspection, and memory read/write - eliminating the need for a 4-wire JTAG header. The MSP430G2332IN20 does not support standard JTAG; SBW is the only hardware debug method, fully compatible with TI's MSP-FET and open-source tools like naken_asm.

What are the key differences between MSP430G2332IN20 and MSP430G2432IN20?

The MSP430G2332IN20 and MSP430G2432IN20 share identical package (20-pin PDIP), pinout, peripherals (ADC10, USI, Timer_A, capacitive-touch I/O), and power specifications. The sole functional difference is flash memory size: MSP430G2332IN20 has 8 KB, while MSP430G2432IN20 has 16 KB. Both devices use the same silicon die variant and are drop-in replacements where firmware fits within 8 KB - making MSP430G2332IN20 ideal for cost-optimized, fixed-function deployments.

Can the MSP430G2332IN20 operate from a single 1.8 V supply, and what are the implications?

Yes, the MSP430G2332IN20 is fully specified to operate from 1.8 V to 3.6 V, with guaranteed performance at 1.8 V across commercial temperature range. At 1.8 V, the maximum CPU frequency is reduced to ~1 MHz (vs. 16 MHz at 3.6 V), and ADC accuracy may degrade slightly due to reference voltage headroom - however, all core peripherals remain functional. This enables direct integration with single-cell lithium primary batteries or energy-harvesting sources, with the MSP430G2332IN20's 0.1 µA LPM4 current preserving operational lifetime.

How many capacitive-touch enabled I/O pins does the MSP430G2332IN20 support?

The MSP430G2332IN20 supports up to 16 capacitive-touch enabled I/O pins - implemented across Port 1 (P1.0–P1.7) and Port 2 (P2.0–P2.7). Each pin includes dedicated hardware pin-oscillator circuitry, allowing simultaneous or sequential touch scanning without CPU-intensive software timers. The MSP430G2332IN20's touch capability is validated in TI's CapTIvate™ design framework and requires only external electrodes and optional shielding - no additional analog components.