Texas Instruments MSP430FG439IZCAT

Overview

MSP430FG439IZCAT from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 60 KB Flash, 2 KB RAM, a 12-bit ADC with 12 channels and internal reference, dual 12-bit DACs, three configurable op-amps, integrated LCD driver for up to 128 segments, and two 16-bit timers - designed for battery-powered analog sensor systems and digital metering applications.

For engineers reviewing the MSP430FG439IZCAT datasheet, MSP430FG439IZCAT pinout, MSP430FG439IZCAT application, or MSP430FG439IZCAT equivalent, key selection criteria include its 1.8–3.6 V supply range, sub-1 µA LPM4 current, <6 µs wake-up time, BGA-113 (ZCA) package, and integrated analog peripherals enabling single-chip sensor-to-display solutions.

Technical Context

The MSP430FG439IZCAT implements a 16-bit CPU with constant generators and a digitally controlled oscillator (DCO), supporting five low-power modes optimized for extended battery life in portable measurement devices. Its architecture integrates dedicated analog subsystems including a 12-bit ADC with sample-and-hold and autoscan, dual synchronized 12-bit DACs, and three programmable operational amplifiers with multiplexed I/O routing.

It features a unified 48-pin I/O structure shared across analog, timer, communication, and LCD functions, with dual 16-bit timers (Timer_A3 and Timer_B3), a USART configurable as UART or SPI, on-chip comparator, brownout detector, and supply-voltage supervisor with programmable threshold detection - all operating within a single 1.8–3.6 V domain.

Key Specifications

Pinout & Package

Package: 113-ball BGA (ZCA), 7 mm × 7 mm, 0.5 mm pitch, bottom-side thermal pad. Pinout defined per TI SLAS380F Rev. F (2022), Figure 7-2 and Section 7.2.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FG439IZCAT, the MSP430FG4619IZQW offers expanded memory and USB but increases layout complexity, while the MSP430F5529IPN sacrifices LCD/DAC integration for USB connectivity - making MSP430FG439IZCAT optimal for self-contained, ultra-low-power display-and-sense applications.

Availability

MSP430FG439IZCAT is available at Aetrix Electronics and suitable for analog sensor systems, hand-held meters, and thermostats requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MSP430FG439IZCAT 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 MSP430FG43x product line targets ultra-low-power portable instrumentation and display-integrated measurement systems, emphasizing analog integration, battery longevity, and minimal external component count.

FAQ

What is the maximum operating frequency of the MSP430FG439IZCAT at 3.6 V?

The MSP430FG439IZCAT achieves a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V, as specified in Section 8.3 of the SLAS380F datasheet. This frequency is generated by the internal digitally controlled oscillator (DCO) and supports real-time processing of ADC conversions, timer operations, and LCD refresh without external crystals. The MSP430FG439IZCAT maintains full peripheral functionality at this speed, including dual 12-bit DAC updates and 12-channel ADC sampling.

Does the MSP430FG439IZCAT support external crystal oscillators?

Yes, the MSP430FG439IZCAT supports two external crystal oscillators: XT1 (32.768 kHz watch crystal or 1–8 MHz crystal/resonator) and XT2 (1–8 MHz crystal/resonator), as documented in Sections 8.3 and 8.19–8.20 of SLAS380F. XT1 provides low-frequency ACLK for RTC and LPM3 operation, while XT2 supplies high-frequency clock sources for MCLK or SMCLK. The MSP430FG439IZCAT does not require external crystals for basic operation, as its DCO delivers stable 1–8 MHz clocks.

How many LCD segments can the MSP430FG439IZCAT drive, and what multiplexing options are supported?

The MSP430FG439IZCAT drives up to 128 LCD segments using its integrated controller with 1:1, 1:2, 1:3, or 1:4 multiplexing, as confirmed in Section 1 (Features) and Section 9.9 of SLAS380F. It provides four COM outputs (COM0–COM3) and 32 SEG outputs (S0–S31 plus additional segment pins), enabling direct interface to static or multiplexed LCD glass. The MSP430FG439IZCAT's LCD module includes built-in charge pump and contrast control registers, eliminating external bias circuitry.

What are the wakeup sources from LPM4 mode on the MSP430FG439IZCAT?

From LPM4 (RAM retention, zero clock activity), the MSP430FG439IZCAT wakes up exclusively via the RST/NMI pin or through the Basic Timer1 overflow interrupt, as stated in Section 9.3 and Table 8-1 of SLAS380F. Unlike lower-power modes, LPM4 disables all internal clocks including ACLK, so peripherals like the ADC, USART, or comparators cannot trigger wake-up. The MSP430FG439IZCAT requires external logic or a watchdog timeout to initiate recovery - a design trade-off for achieving 0.1 µA quiescent current.

Is the MSP430FG439IZCAT pin-compatible with other MSP430FG43x variants in the ZCA package?

Yes, the MSP430FG439IZCAT is pin-compatible with MSP430FG438IZCAT and MSP430FG437IZCAT in the 113-ball ZCA package, as verified in Table 6-1 (Device Comparison) and Section 11 of SLAS380F. All three share identical pin assignments, electrical characteristics, and peripheral mappings; only Flash (60/48/32 KB) and RAM (2/2/1 KB) differ. Firmware developed for MSP430FG439IZCAT runs unmodified on the others, enabling scalable memory options without PCB redesign.