Texas Instruments TMS320F28235PGFA

Introduction to TMS320F28235PGFA

The Texas Instruments TMS320F28235PGFA is a part of the C2000™ C28x Delfino™ series of high-performance real-time microcontrollers, designed to address demanding control applications across industrial, automotive, and energy domains. Featuring a 32-bit single-core CPU operating at up to 150 MHz, and housed in a 176-LQFP package, the TMS320F28235PGFA brings together substantial processing power, versatile peripherals, and robust interfacing options. Its 512KB flash memory and extensive on-chip RAM enable advanced control algorithms and rapid data handling, while its operational range (-40 °C to 85 °C) ensures suitability for a wide spectrum of environments.

Processing architecture and core capabilities of TMS320F28235PGFA

At the heart of the TMS320F28235PGFA lies the TMS320C28x core, delivering deterministic real-time performance with efficient instruction throughput—a cycle time of 6.67ns at its maximum 150 MHz operation. The architecture incorporates a Harvard bus, enhancing parallel data and instruction transfers, along with dedicated 32-bit floating-point support (FPU), vital for demanding motor control and signal processing functions.

Integrated hardware accelerators for multiply-accumulate (MAC) operations, including 16×16 and 32×32 MAC and dual MAC units, make this device ideal for closed-loop control within time-constrained environments. For further flexibility, the unified memory programming model allows seamless code development in C/C++ or assembly for high code efficiency. Advanced debug and real-time analysis features, compliant with IEEE Standard 1149.1 (JTAG), support streamlined firmware validation and robust development cycles.

Extensive peripherals available on TMS320F28235PGFA

A distinguishing feature of the TMS320F28235PGFA is its rich peripheral set, enabling complex control topologies and multi-protocol communications without external components. It integrates:

Up to 88 individually programmable GPIO pins with multiplexing and input filtering, facilitating flexible external interfacing.

Serial communication options including up to 3 SCI (UART-compatible), 2 CAN modules (32-mailbox), 2 McBSP ports (configurable as SPI), one dedicated SPI, and one I2C bus for expanded connectivity.

Six enhanced PWM outputs, six high-resolution PWM outputs (with 150-ps MEP), six event capture inputs, two quadrature encoder interfaces, three 32-bit CPU timers, and nine 16-bit peripheral timers, supporting advanced motor and power control scenarios.

A 12-bit ADC with 16 channels and 80ns conversion rate, delivering reliable signal acquisition for closed-loop control.

Six-channel DMA controller for fast, interrupt-free transfers between peripherals and memory.

Comprehensive system control resources, including a watchdog timer and low-power idle/standby modes for energy savings.

Boundary scan and JTAG debugging for manufacturing test and validation.

The combination of such peripherals makes the TMS320F28235PGFA well-suited for applications demanding precision, speed, and robust communication, such as motor drives, energy inverters, ADAS systems, and factory automation.

Memory layout and protection features of TMS320F28235PGFA

Robust memory design is essential in real-time control environments, and the TMS320F28235PGFA delivers with 512KB (256K×16) on-chip flash for program storage and 34K×16-bit single-access RAM (SARAM) for rapid data exchange. Further, there is an 8K×16 boot ROM and a 1K×16 one-time programmable (OTP) ROM, enhancing boot flexibility and data integrity.

The device offers advanced security features, including a 128-bit key-based mechanism to lock and protect the flash, OTP, and RAM, crucial for intellectual property protection and firmware security in commercial and automotive applications. The flash memory is organized in eight sectors, allowing efficient partitioning for code, data, and bootloader implementations.

Power requirements, environmental specifications, and heat management for TMS320F28235PGFA

For reliable operation, the TMS320F28235PGFA utilizes a core voltage of 1.805V – 1.995V with 3.3V I/O compatibility, supporting integration into mixed-signal and legacy environments. The device operates across –40 °C to 85 °C, with automotive-grade AEC-Q100 qualification available for selected derivatives. Its low-power design supports multiple energy-saving modes—IDLE, STANDBY, HALT—enabling optimized power consumption strategies.

Thermal design is facilitated by the availability of comprehensive package options, allowing selection tailored to specific environmental challenges and board layouts. Developers are advised to consult the manufacturer's thermal resistance and power consumption guidelines to achieve optimal performance and reliability in their final implementations.

Package types and physical characteristics of TMS320F28235PGFA

The TMS320F28235PGFA is available in a 176-LQFP (24 × 24 mm) surface mount package, supporting high-density designs and automated assembly. It is also produced in HLQFP for thermally enhanced applications, and comparable ball grid array (BGA) variants are available in related family models.

Multiple packaging options across the device series cater to mechanical, thermal, and assembly requirements, including nFBGA (179-ball, 12 × 12 mm), MicroStar BGA (179-ball, 12 × 12 mm), and ZJZ BGA (176-ball, 15 × 15 mm). This packaging flexibility facilitates integration into both space-constrained and high-thermal-stress designs.

Alternative or substitute devices for TMS320F28235PGFA

For system designers considering pin-compatible, performance-based, or feature-driven alternatives, Texas Instruments offers a family of related C2000 MCU models. Viable replacements or equivalents for the TMS320F28235PGFA include:

TMS320F28235-Q1: Automotive-qualified variant with extended temperature range.

TMS320F28335/28334/28333/28332: Devices with similar architecture, varying in clock speed, memory configurations, peripheral counts, and feature sets.

TMS320F28234/28232: Devices offering lower flash and RAM sizes for cost or power-sensitive applications.

Each alternative is differentiated by performance, package, feature arsenal, and temperature grade, allowing adaptation according to the precise needs of an application—be it enhanced computational capacity, optimized cost, or extended automotive or industrial qualification. Comparison tables in manufacturer documentation detail these distinctions for informed selection.

Use cases of TMS320F28235PGFA

The robust features and proven architecture of the TMS320F28235PGFA make it a premier choice for diverse engineering applications, including:

Motor control: AC/DC servo drives, BLDC motor drives, HVAC control, and traction inverter modules, where real-time responsiveness and precision are mandatory.

Power electronics: Grid infrastructure inverters, solar string inverters, industrial AC-DC conversion, and on-board battery charger systems benefiting from deterministic closed-loop control and high-speed peripherals.

Automotive systems: Advanced driver assistance systems (ADAS), medium/short-range radar, hybrid and electric vehicle powertrain control, requiring high reliability and rapid signal processing.

Factory automation and control: CNC controllers, automated sorting, and servo drive modules, enabling advanced I/O and feedback mechanisms for tight process control.

Engineers should consider the device’s comprehensive peripheral mix, real-time processing power, and secure memory features when targeting systems demanding high precision, robust connectivity, and safety-critical compliance.

Conclusion

The TMS320F28235PGFA stands out as a high-performance, highly integrated real-time microcontroller optimized for complex motor control, power delivery, and industrial automation applications. Its advanced computing capabilities, versatile on-chip peripherals, robust security, and proven reliability make it a critical component for engineers seeking to implement precise control and high-speed signal processing in state-of-the-art electronic systems. With a family of equivalent models available, designers are equipped with a flexible portfolio—enabling tailored selection for specific application demands and future-proofing their investment in embedded control technologies.