Texas Instruments MSP430F5438AMPZREP

Overview

MSP430F5438AMPZREP from Texas Instruments is an ultralow-power 16-bit RISC microcontroller designed for extended-battery-life embedded measurement systems. It integrates 256 KB flash, 16 KB RAM, a 12-bit ADC with 14 external + 2 internal channels, three 16-bit timers (TA0/TA1/TB0), four USCI modules supporting UART/IrDA/SPI/I²C, and operates across –55°C to 125°C. It serves in radiation-tolerant sensor nodes and aerospace telemetry interfaces.

For engineers reviewing the MSP430F5438AMPZREP datasheet, MSP430F5438AMPZREP pinout, MSP430F5438AMPZREP application, or MSP430F5438AMPZREP equivalent, key selection criteria include its extended-temperature PQFP-100 packaging, integrated LDO core regulation, real-time clock with alarm, DMA support, and low-power wake-up timing (3.5 µs from LPM3).

Technical Context

The MSP430F5438AMPZREP implements a unified clock system with FLL-based frequency stabilization, supporting up to 25 MHz system clock via XT2 (32 MHz max crystal), DCO, VLO, and REFO sources. Its CPUXV2 core executes register-to-register operations in one cycle and includes hardware multiplier and constant generators for optimized code density.

Peripherals are memory-mapped and accessible via all instructions; interrupt handling uses fixed-vector priority (63 levels), with dedicated vectors for ADC12, USCI_A/Bx, timers, RTC, and DMA. The device supports Spy-Bi-Wire and JTAG debug interfaces using shared pins (PJ.0–PJ.3, RST/NMI/SBWTDIO, TEST/SBWTCK) without requiring external programming voltage.

Key Specifications

Pinout & Package

PQFP-100 (PZ) package with 0.5 mm pitch, 14 × 14 mm body size, and exposed thermal pad (not electrically connected). Pin functions validated per TI SLAS967A Table 2 for MSP430F5438AMPZREP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F5438AIPZ and MSP430F6438IPZ, the MSP430F5438AMPZREP uniquely delivers M-temp qualification, product traceability, and extended lifecycle management - making it the sole option for certified safety-critical deployments where component pedigree and long-term supply continuity are mandatory.

Availability

MSP430F5438AMPZREP is available at Aetrix Electronics and suitable for aerospace telemetry, radiation-hardened sensor systems, and medical implantable monitors requiring stable component supply over multi-decade production lifecycles.

Supply support for MSP430F5438AMPZREP 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 over 50 years of innovation in low-power design.

The MSP430F5438AMPZREP belongs to TI's MSP430x5xx ultra-low-power microcontroller family, engineered specifically for battery-operated measurement and control applications demanding precision analog integration, deterministic real-time response, and extreme energy efficiency.

FAQ

What is the maximum operating frequency supported by the MSP430F5438AMPZREP?

The MSP430F5438AMPZREP supports a maximum system clock of 25 MHz via its FLL-controlled DCO, with optional high-frequency crystal support up to 32 MHz on XT2. However, crystal operation above 85°C is not ensured per TI SLAS967A, and the device is rated for full functionality across –55°C to 125°C using internal clock sources. The 25-MHz specification reflects guaranteed timing closure under M-temp conditions.

Does the MSP430F5438AMPZREP support JTAG debugging?

Yes, the MSP430F5438AMPZREP supports standard 4-wire JTAG debugging using PJ.0 (TDO), PJ.1 (TDI/TCLK), PJ.2 (TMS), and PJ.3 (TCK), with RST/NMI/SBWTDIO and TEST/SBWTCK enabling mode selection. JTAG access is fully functional across the –55°C to 125°C range and is documented in the MSP430x5xx Family User's Guide (SLAU208).

How many ADC input channels does the MSP430F5438AMPZREP provide?

The MSP430F5438AMPZREP features the ADC12_A module with 14 external analog input channels (A0–A15, excluding reserved pins) and 2 internal channels (temperature sensor and supply voltage), totaling 16 selectable inputs. Channel mapping and multiplexing are controlled via ADC12MCTLx registers, and autoscan mode allows sequential conversion without CPU intervention.

What is the purpose of the VCORE pin on the MSP430F5438AMPZREP?

The VCORE pin on the MSP430F5438AMPZREP is the output of the integrated low-dropout regulator supplying the CPU and core logic at ~1.8 V. It is for internal use only: no external loading is permitted, and it must be connected only to the recommended decoupling capacitor (CVCORE) as specified in the datasheet. Connecting external circuitry to VCORE violates TI's design guidelines and risks instability.

Can the MSP430F5438AMPZREP operate without an external crystal?

Yes, the MSP430F5438AMPZREP can operate entirely from internal clock sources: the DCO (calibrated up to 25 MHz), VLO (12 kHz), and REFO (32.768 kHz). External crystals (XT1 for 32 kHz, XT2 for high-frequency) are optional and used only when higher precision or lower jitter is required - for example, in RTC or synchronous communication applications.