Texas Instruments MSP430G2433IPW20R

Overview

MSP430G2433IPW20R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 8 KB flash, 512 B RAM, a 10-bit 200-ksps ADC with 8 channels and internal reference, two 16-bit Timer_A modules, USCI supporting UART/LIN/IrDA/SPI/I²C, and capacitive-touch-capable I/O on a 20-pin TSSOP package. It targets battery-powered sensor nodes and portable measurement systems requiring sub-1-µs wake-up and <0.1 µA off-mode retention.

For engineers reviewing the MSP430G2433IPW20R datasheet, MSP430G2433IPW20R pinout, MSP430G2433IPW20R application, or MSP430G2433IPW20R equivalent, key selection criteria include calibrated DCO frequencies (1/8/12/16 MHz), 1.8–3.6 V supply range, Spy-Bi-Wire debug interface, brownout detection, and 24 capacitive-touch-enabled I/O pins across 20-pin TSSOP, 28-pin TSSOP, and 32-pin QFN variants.

Technical Context

The MSP430G2433IPW20R implements a 16-bit CPU with constant generators and 62.5-ns instruction cycle time, paired with a digitally controlled oscillator (DCO) that supports four factory-calibrated frequencies up to 16 MHz. Its clock system integrates internal VLO, external 32-kHz crystal support, and digital clock sources for flexible low-power timing.

Peripherals include dual 16-bit Timer_A units each with three capture/compare registers, USCI_A0 (UART/LIN/IrDA/SPI) and USCI_B0 (SPI/I²C), and a 10-bit ADC with autoscan, sample-and-hold, and built-in voltage reference - all operating within five power-saving modes and enabling wake-up from standby in under 1 µs.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW20), 6.5 mm × 4.4 mm body size, lead pitch 0.65 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2433IPW20R, the MSP430G2533IPW20R offers double flash for complex protocols or logging, while the MSP430G2433IPW28R provides 8 extra GPIOs and full Port 3 access - both maintain identical ultra-low-power behavior and peripheral register mapping.

Availability

MSP430G2433IPW20R is available at Aetrix Electronics and suitable for smart sensor nodes, capacitive touch interfaces, portable medical monitors, and low-cost industrial data loggers requiring stable component supply and long-term manufacturability.

Supply support for MSP430G2433IPW20R 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 with emphasis on energy efficiency and system integration.

The MSP430G2x33 product line delivers ultra-low-power mixed-signal MCUs optimized for battery-operated sensor systems, emphasizing rapid wake-up, integrated analog peripherals, and minimal external component count.

FAQ

What is the maximum system clock frequency supported by the MSP430G2433IPW20R?

The MSP430G2433IPW20R 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. These limits are defined by the DCO's calibrated frequencies and ensure stable operation across the full 1.8–3.6 V supply range. The MSP430G2433IPW20R does not require an external crystal to achieve these speeds due to its factory-trimmed DCO.

Does the MSP430G2433IPW20R include hardware support for capacitive touch sensing?

Yes, the MSP430G2433IPW20R supports capacitive touch sensing on up to 24 I/O pins without external components. This capability leverages the device's enhanced GPIO structure, integrated timers, and low-noise ADC to implement charge-transfer or relaxation-oscillator-based touch detection. The MSP430G2433IPW20R's firmware libraries from TI further simplify implementation of button, slider, and wheel interfaces.

Can the MSP430G2433IPW20R operate from a single 1.8 V supply?

Yes, the MSP430G2433IPW20R is fully specified for operation from 1.8 V to 3.6 V. At 1.8 V, it delivers 6 MHz system clock performance, 230 µA active current (at 1 MHz), and retains full functionality including ADC, USCI, and timers. This makes the MSP430G2433IPW20R ideal for single-cell alkaline or lithium primary battery applications where regulated 3.3 V is unavailable.

What debug interface does the MSP430G2433IPW20R use, and how many pins are required?

The MSP430G2433IPW20R uses the Spy-Bi-Wire (SBW) interface, a two-wire variant of JTAG that requires only RST/NMI/SBWTDIO and TEST/SBWTCK pins. This reduces debug footprint versus standard 4-wire JTAG and enables in-system programming and real-time debugging with minimal PCB routing. The MSP430G2433IPW20R integrates on-chip emulation logic, eliminating external debug adapters in most development scenarios.

Is the ADC on the MSP430G2433IPW20R capable of autonomous operation without CPU intervention?

Yes, the 10-bit ADC on the MSP430G2433IPW20R supports autoscan mode and can be triggered by Timer_A outputs or software, with conversion results stored directly to memory via DMA-like channel sequencing. While the MSP430G2433IPW20R lacks a dedicated DMA controller, its ADC10MEM auto-increment and USCI-triggered start enable efficient background sampling - reducing CPU load during continuous sensor acquisition.