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TMS320F28335PGFA: Texas Instruments C2000 Real-Time Microcontroller
10/13/2026 6:37:44 PM
TMS320F28335PGFA: Texas Instruments C2000 Real-Time Microcontroller
1. Overview
The TMS320F28335PGFA is a high-performance 32-bit real-time microcontroller from Texas Instruments' C2000 Delfino platform. It is built around the TMS320C28x core, runs at up to 150 MHz with a 6.67 ns instruction cycle, and integrates an IEEE 754 single-precision floating-point unit. On-chip memory includes 256K×16 flash, 34K×16 SARAM, and 1K×16 OTP. The device is housed in a 176-pin LQFP package. It targets motor control, digital power, photovoltaic inverters, energy storage converters, charging piles, industrial variable-frequency drives, and servo systems. Real-time control applications demand fast interrupt response, precise PWM, high-speed ADC sampling, and reliable communication, and the F28335 balances these requirements effectively.
2. Core Architecture and Memory
The device uses a Harvard bus architecture and an 8-stage pipeline. It supports single-cycle 32×32 multiply-accumulate and 16×16 dual MAC operations. The floating-point unit lets developers write floating-point control algorithms directly in C without manual Q-format scaling. The 256K×16 flash can hold complex control programs, while 34K×16 SARAM serves variables and stack space. A 1K×16 OTP area can store calibration parameters. The chip also includes a 128-bit security key and lock to protect flash, OTP, and RAM contents from unauthorized access. The clock system provides an on-chip oscillator, PLL, and watchdog. Power is supplied by a 1.9 V core and 3.3 V I/O, with multiple low-power modes available.
3. Peripherals
The F28335 offers rich peripherals. It provides up to 18 ePWM outputs, six of which are HRPWM channels with 150 ps micro-edge positioning accuracy, making it suitable for digital power and motor drive. The 12-bit ADC has 16 channels and an 80 ns conversion time with automatic sequencing. Other resources include three analog comparators, six eCAP channels, two eQEP interfaces, and a six-channel DMA. Communication interfaces include eCAN, SCI, SPI, I2C, and McBSP, with up to 88 GPIO pins. The package is 176-LQFP, and the operating temperature range is -40°C to +85°C.
4. Key Specifications
| Parameter | Specification |
|---|---|
| Core | TMS320C28x, 32-bit |
| Frequency | 150 MHz, 6.67 ns cycle |
| FPU | IEEE 754 single-precision |
| Flash | 256K×16 |
| SARAM | 34K×16 |
| ADC | 12-bit, 16 channels, 80 ns |
| PWM | Up to 18 channels, 6 HRPWM |
| Connectivity | eCAN, SCI, SPI, I2C, McBSP |
| GPIO | Up to 88 |
| Package | 176-LQFP |
| Temperature | -40°C to +85°C |
| Supply | 1.9 V core, 3.3 V I/O |
5. Q&A
Q: What are the practical benefits of the floating-point unit?
A: The FPU allows PID, Clarke/Park transforms, and SVPWM algorithms to be written directly in C without Q-format scaling. This makes code more intuitive, reduces precision loss, shortens development time, and improves average performance by about 50% over fixed-point C28x devices.
Q: What development tools and software ecosystem are commonly used?
A: Code Composer Studio is recommended and supports ANSI C/C++. TI also provides C2000Ware, DSP/BIOS, SYS/BIOS, digital motor control libraries, and digital power libraries for rapid project setup.
Q: What is the main difference from the F28334 in the same series?
A: Both run at 150 MHz and include an FPU. The key difference is flash size: the F28335 offers 256K×16 flash, while the F28334 provides 128K×16. Both have 34K×16 SARAM. The F28335 is preferable when larger program memory is needed.
Q: What are typical applications?
A: It is widely used in permanent magnet synchronous motor field-oriented control, digital power, photovoltaic inverters, energy storage converters, charging piles, industrial variable-frequency drives, and all-electric injection molding machines.
6. Summary
With a floating-point core, rich peripherals, a mature ecosystem, and industrial-grade reliability, the TMS320F28335PGFA remains a classic choice for real-time control. It continues to offer strong practical value for engineers designing high-performance motor control or digital power systems.
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