Texas Instruments MSP430G2332IPW20R

Overview

MSP430G2332IPW20R from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 4 KB Flash, 256 B RAM, a 10-bit 200-ksps ADC with internal reference and autoscan, one 16-bit Timer_A with three capture/compare registers, USI supporting SPI and I²C, and up to eight capacitive-touch enabled I/O pins. It operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430G2332IPW20R datasheet, MSP430G2332IPW20R pinout, MSP430G2332IPW20R application, or MSP430G2332IPW20R equivalent, key selection criteria include its 10-bit ADC channel count, TSSOP-20 package compatibility, Spy-Bi-Wire debug interface, low-power mode timing (sub-1 µs wake-up), and integrated brownout detection for robust operation in energy-constrained embedded designs.

Technical Context

The MSP430G2332IPW20R implements a digitally controlled oscillator (DCO) calibrated at 1 MHz, 8 MHz, 12 MHz, and 16 MHz, enabling fast active-mode transitions from LPM4 in under 1 µs. Its clock system supports ACLK (LF oscillator or 32-kHz crystal), SMCLK (DCO-derived), and MCLK (CPU clock), all configurable via BCSCTL registers.

It integrates a 10-bit successive-approximation ADC (ADC10) with eight analog input channels (A0–A7), internal 1.5-V/2.5-V reference, sample-and-hold, and DMA-capable data transfer controller (DTC). The USI module provides hardware-level SPI and I²C protocol support without CPU intervention during transfers.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), 0.65 mm pitch, body size 6.5 × 4.4 mm, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430G2432IPW20R, the MSP430G2332IPW20R offers optimal cost/performance balance for fixed-function sensor nodes; versus MSP430FR2355IPW20R, it delivers proven Flash reliability and lower entry-level tooling cost, though with reduced ADC resolution and no FRAM write endurance.

Availability

MSP430G2332IPW20R is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical monitors, industrial control panels, and energy harvesting nodes requiring stable component supply across long-lifecycle industrial and medical programs.

Supply support for MSP430G2332IPW20R 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 personal electronics markets.

The MSP430G2xx family was designed specifically for ultra-low-power, cost-sensitive embedded applications where battery life, small footprint, and integrated analog functionality are critical - exemplified by the MSP430G2332IPW20R's optimized sensor interface and sub-µA sleep performance.

FAQ

What is the maximum ADC sampling rate supported by the MSP430G2332IPW20R?

The MSP430G2332IPW20R supports a maximum ADC sampling rate of 200 ksps (kilo-samples per second) using its 10-bit successive-approximation register (SAR) core. This rate is achievable with internal reference and autoscan enabled, and is specified under typical conditions of 3.3 V supply and 25°C ambient temperature. The actual sustained rate depends on clock source stability and software overhead in the MSP430G2332IPW20R firmware.

Does the MSP430G2332IPW20R support capacitive-touch sensing on all port pins?

No, the MSP430G2332IPW20R supports capacitive-touch sensing only on up to eight P1.x pins (P1.0 through P1.7), enabled individually via the PinOsc module. Port P2 pins do not support this feature. Each enabled pin requires configuration of P1SEL, P1DIR, and P1REN registers, and the pin-oscillator must be activated in software - a capability confirmed in the MSP430G2332IPW20R functional block diagram and peripheral description.

What debug interface does the MSP430G2332IPW20R use, and is external hardware required?

The MSP430G2332IPW20R uses the 2-wire Spy-Bi-Wire (SBW) interface for programming and debugging, accessible via pins RST/NMI/SBWTDIO (Pin 16) and TEST/SBWTCK (Pin 17). No external voltage generator is needed - SBW operates from the target's DVCC supply. A TI MSP-FET or compatible debugger is required, but no additional level-shifting circuitry is necessary for standard 3.3 V operation of the MSP430G2332IPW20R.

Can the MSP430G2332IPW20R operate from a single 1.8 V supply, and what are the implications?

Yes, the MSP430G2332IPW20R is fully specified to operate from 1.8 V to 3.6 V. At 1.8 V, the maximum CPU frequency is reduced to 1 MHz (per DCO calibration data), and ADC performance may show increased INL/DNL error. However, all core peripherals - including USI, Timer_A, and brownout detection - remain functional. This makes the MSP430G2332IPW20R suitable for energy-harvesting or ultra-low-voltage battery applications where 1.8 V represents the usable endpoint of discharge.

How many analog input channels does the MSP430G2332IPW20R ADC support, and are they multiplexed?

The MSP430G2332IPW20R ADC10 module supports eight analog input channels (A0 through A7), mapped to P1.0–P1.7 respectively. These channels are fully multiplexed within the ADC10MEM register, and autoscan mode allows sequential conversion of any subset without CPU intervention. Channel selection is controlled via ADC10CTL1 and ADC10AE0 registers, and all eight channels are confirmed active in the MSP430G2332IPW20R-specific terminal functions table.