Texas Instruments MSP430G2533IN20

Overview

MSP430G2533IN20 from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller featuring 16 KB Flash, 512 B RAM, a 10-bit 200-ksps ADC with 8 channels, two 16-bit Timer_A modules (each with three capture/compare registers), USCI supporting UART/LIN/IrDA/SPI/I²C, and capacitive-touch-enabled I/O. It operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2533IN20 datasheet, MSP430G2533IN20 pinout, MSP430G2533IN20 application, or MSP430G2533IN20 equivalent, key selection criteria include its 20-pin PDIP package, integrated ADC with internal reference, Spy-Bi-Wire debug interface, and five low-power modes enabling sub-1 µs wake-up - critical for energy-constrained embedded sensing and control designs.

Technical Context

The MSP430G2533IN20 implements a 16-bit RISC CPU with constant generators and a digitally controlled oscillator (DCO) calibrated to 1 MHz, 8 MHz, 12 MHz, and 16 MHz. Its clock system supports multiple sources: internal DCO, 32-kHz crystal (XT1), internal VLO, and external digital clock input.

It integrates dual USCI modules (USCI_A0 for UART/LIN/IrDA/SPI; USCI_B0 for SPI/I²C), a 10-bit ADC with sample-and-hold and autoscan, brownout detection, and on-chip emulation logic. Port P1 and P2 provide 16 total I/O pins in the 20-pin PDIP package, all supporting interrupt capability and configurable pullup/pulldown resistors.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Dual In-line Package (PDIP), 24.33 mm × 6.35 mm body size, through-hole mounting. Pin pitch: 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2433IN20, the MSP430G2533IN20 provides double Flash capacity for complex sensor fusion or bootloader+application partitioning; compared with MSP430G2553IPW28, it trades I/O count and analog rail separation for through-hole manufacturability and legacy board compatibility.

Availability

MSP430G2533IN20 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, and energy metering subsystems requiring stable component supply across long-lifecycle production programs.

Supply support for MSP430G2533IN20 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 delivers ultra-low-power mixed-signal MCUs targeting cost-sensitive, battery-operated applications such as sensor interfaces, portable instrumentation, and simple human-machine interfaces.

FAQ

What is the maximum operating frequency of the MSP430G2533IN20?

The MSP430G2533IN20 supports a maximum system clock (MCLK) frequency of 16 MHz when VCC ≥ 3.3 V, 12 MHz at 2.7 V, and 6 MHz at 1.8 V. This is achieved using the factory-calibrated DCO oscillator; external crystals up to 16 MHz may also be used via the XT1 oscillator module. The MSP430G2533IN20's 16-bit RISC architecture ensures deterministic execution at these rates.

Does the MSP430G2533IN20 support capacitive touch sensing?

Yes, the MSP430G2533IN20 supports capacitive touch sensing on up to 24 I/O pins. In the 20-pin PDIP package (MSP430G2533IN20), all P1.x and P2.x pins - totaling 16 I/Os - are capacitive-touch enabled. This capability is implemented in hardware via the built-in comparator and timer resources, requiring no external components for basic proximity or button detection.

What debug interface does the MSP430G2533IN20 use?

The MSP430G2533IN20 uses the Spy-Bi-Wire (SBW) interface - a 2-wire variant of JTAG - for in-system programming and real-time debugging. It requires only two pins: RST/NMI/SBWTDIO (pin 16) and TEST/SBWTCK (pin 17). This eliminates the need for a full 4-pin JTAG header, saving PCB space and simplifying debug connectivity during development and field servicing of the MSP430G2533IN20.

Is the ADC on the MSP430G2533IN20 hardware-calibrated?

Yes, the 10-bit ADC on the MSP430G2533IN20 includes factory-calibrated offset and gain coefficients stored in information memory. These values can be loaded at runtime to correct for process variation, improving absolute accuracy without external calibration routines. The ADC also features an internal 1.5-V reference and supports external references (VREF+/VREF−) on pins P1.3 and P1.4 for enhanced precision in the MSP430G2533IN20.

Can the MSP430G2533IN20 operate from a single 1.8-V supply?

Yes, the MSP430G2533IN20 is fully specified to operate from 1.8 V to 3.6 V. At 1.8 V, it achieves up to 6 MHz system clock frequency and maintains full functionality including ADC operation, USCI communication, and low-power modes. Active current consumption is 230 µA at 1 MHz/2.2 V, scaling predictably downward at lower voltages - making the MSP430G2533IN20 ideal for single-cell lithium or alkaline battery systems.