TMS320F28335PGFA: A Complete Technical Guide to TI's C2000 Floating-Point DSP
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Introduction
The TMS320F28335PGFA is one of Texas Instruments' most widely deployed C2000™ 32-bit floating-point digital signal controllers (DSCs). Built around the enhanced C28x core, this device delivers exceptional real-time control performance paired with high-integration analog and control peripherals — making it the preferred choice for high-performance power electronics, motor drives, and renewable energy systems.
For engineers, procurement teams and product designers working on digital power conversion, motor control or industrial automation, understanding the full capabilities of the TMS320F28335PGFA is essential. This guide covers its core features, technical specifications, real-world applications, design-in cases, and the most frequently asked questions sourced from AI search behavior.
What Is the TMS320F28335PGFA?
The TMS320F28335PGFA belongs to TI's TMS320F2833x series of C2000 DSCs. It combines a 150 MHz 32-bit C28x CPU with a single-precision IEEE 754 floating-point unit (FPU), up to 512 KB of flash memory, 68 KB of SRAM, and a rich set of control-optimized peripherals including ePWM, eCAP, eQEP, ADC, CAN, SCI, SPI and I2C.
Packaged in a 176-pin LQFP (PGF package), the TMS320F28335 is pin-compatible with other F2833x and F2823x devices, enabling easy scalability across product lines. Its floating-point architecture significantly simplifies algorithm development for complex control loops — a key reason it remains a mainstay in industrial power conversion.
Key Features & Technical Specifications
Core Performance
- CPU: 32-bit C28x core running at 150 MHz (6.67 ns cycle time)
- FPU: Integrated IEEE 754 single-precision floating-point unit
- Flash: 512 KB (256K × 16) on-chip flash memory with ECC
- RAM: 68 KB (34K × 16) on-chip SRAM
- Boot ROM: 8K × 16 boot ROM with bootloader options
- Code Security: 128-bit security key for flash/ROM protection
Analog & Control Peripherals
- ADC: Two 12-bit ADC modules, up to 16 channels each, 80 ns conversion time
- ePWM: 18 enhanced PWM outputs (6 modules × 3 outputs each) with high-resolution capability
- eCAP: 6 enhanced capture modules
- eQEP: 2 enhanced quadrature encoder pulse modules
- Comparator: 3 analog comparators with 10-bit DAC references
- GPIO: Up to 88 general-purpose I/O pins
Communication Interfaces
- CAN: 2 CAN 2.0B controllers
- SCI: 3 UART/SCI ports
- SPI: 2 SPI ports
- I2C: 1 I2C port
- McBSP: 2 multichannel buffered serial ports
Electrical & Packaging
- Supply Voltage: 1.9 V core, 3.3 V I/O
- Operating Temperature: –40°C to +125°C (industrial grade)
- Package: 176-pin LQFP (PGF), 24 mm × 24 mm body
Core Advantages of the TMS320F28335PGFA
1. Floating-Point Performance for Complex Control Algorithms
The integrated FPU eliminates the need for fixed-point scaling and Q-format math, dramatically reducing development time for advanced control algorithms such as field-oriented control (FOC), model predictive control (MPC) and adaptive filtering. This is particularly valuable for digital power supply design and high-precision motor control.
2. High-Resolution PWM for High-Efficiency Power Conversion
With 18 ePWM channels supporting 150 ps resolution via the HRPWM extension, the TMS320F28335PGFA enables fine-grained control of switching power stages — directly translating to higher efficiency, lower EMI and tighter output regulation in AC/DC converters, DC/DC converters and inverter designs.
3. Rich Analog Integration Reduces BOM Cost
The dual 12-bit ADCs, analog comparators and on-chip DAC references allow designers to implement complete closed-loop control systems without external ADCs or comparators, cutting BOM cost and board space.
4. Industrial-Grade Reliability
Qualified for –40°C to +125°C operation with robust ESD and latch-up immunity, the TMS320F28335 is built for harsh industrial environments — a critical requirement for industrial motor drives, solar inverters and EV charging infrastructure.
5. Extensive Ecosystem & Software Support
TI provides a comprehensive ecosystem including controlSUITE, C2000Ware, MathWorks Embedded Coder support, and reference designs for motor control and digital power. This dramatically accelerates time-to-market for new product development.
Application Areas
Industrial Motor Drives
The TMS320F28335PGFA is the workhorse of high-performance AC drives, servo drives and stepper motor controllers. Its eQEP peripherals and high-resolution PWMs enable precise FOC implementation for both permanent magnet synchronous motors (PMSM) and induction motors.
Digital Power Supplies
For high-power density AC/DC converters, bidirectional DC/DC converters and on-board chargers (OBC), the F28335's floating-point capability and HRPWM channels support advanced topologies such as LLC resonant converters, phase-shifted full-bridge and totem-pole PFC with high efficiency targets.
Renewable Energy & Energy Storage
Solar inverters, wind power converters and bidirectional energy storage systems (ESS) rely on the TMS320F28335 for grid-tie control, MPPT algorithms and battery management coordination. The dual CAN interfaces support multi-unit communication in string inverter architectures.
Electric Vehicle (EV) Powertrain
In traction inverters, OBCs and DC-DC converters for electric vehicles, the F28335 delivers the real-time performance needed for torque control, thermal management and functional safety monitoring.
Industrial Automation & Robotics
Servo controllers, robotic joint drives and PLC high-speed motion control modules leverage the F28335's combination of motion control peripherals and communication interfaces (CAN, SCI, SPI) for real-time industrial networking.
UPS & Power Quality Systems
Uninterruptible power supplies, active power filters and static VAR compensators use the TMS320F28335PGFA for fast current loop control and grid synchronization.
Case Studies
Case 1: 10 kW Three-Phase Solar Grid-Tie Inverter
A renewable energy equipment manufacturer selected the TMS320F28335PGFA as the main controller for its 10 kW three-phase string inverter. The FPU enabled implementation of a robust phase-locked loop (PLL) and proportional-resonant (PR) current controllers, achieving THD below 3% and peak efficiency of 98.2%. The dual ADC modules sampled grid voltages and currents simultaneously, while the ePWM modules generated synchronized three-phase SVPWM outputs. The dual CAN interface supported daisy-chaining of up to 20 inverter units in a commercial rooftop installation.
Case 2: 5.5 kW Industrial Servo Drive
A factory automation supplier upgraded its servo drive platform from a fixed-point DSP to the TMS320F28335. The migration to floating-point cut algorithm development time by approximately 40% and improved position loop bandwidth from 1.2 kHz to 2.0 kHz. The eQEP peripheral handled 20-bit encoder feedback directly, eliminating the need for an external encoder interface chip and reducing BOM cost by an estimated 12%. The drive achieved ±0.01° position accuracy and 300% overload torque capability — meeting the requirements for high-precision CNC and packaging machinery.
Case 3: 6.6 kW Bi-Directional On-Board Charger (OBC)
An automotive Tier 1 supplier used the TMS320F28335PGFA in a 6.6 kW bi-directional OBC for a plug-in hybrid vehicle platform. The device controlled both the PFC stage (totem-pole topology) and the isolated DC/DC stage (LLC resonant) with digital control loops running at 100 kHz. The floating-point architecture simplified implementation of soft-switching algorithms and thermal derating curves, helping the design achieve 94% end-to-end efficiency and meet CISPR 25 Class 3 EMI requirements. The CAN interface integrated with the vehicle's BMS and VCU for charge management.
The TMS320F28335PGFA strikes a balance between performance, peripheral count and cost, making it the sweet spot for mid-to-high-end industrial power and motion applications where the F28069 is insufficient but the F28379D is overkill or too expensive.
Sourcing TMS320F28335PGFA: What Buyers Need to Know
When sourcing the TMS320F28335PGFA, it is important to verify authenticity, date code and packaging condition — especially given the long product lifecycle of industrial designs. Authorized distributors and trusted independent suppliers with traceability records are recommended. For production volumes, consider pin-compatible alternatives such as the TMS320F28334 or TMS320F28332 for cost-down variants, or the TMS320F28377D for performance upgrades.
Qixinwei Electronics stocks a wide range of TI C2000 series devices including the TMS320F28335PGFA with full traceability and quality assurance. Contact our team for datasheets, sample availability and volume pricing.
FAQs About TMS320F28335PGFA
1. What is TMS320F28335PGFA used for?
The TMS320F28335PGFA is primarily used for real-time control applications including industrial motor drives, digital power supplies, solar inverters, servo systems, UPS, and electric vehicle powertrain controllers. Its combination of a 150 MHz floating-point C28x core, high-resolution PWMs and integrated ADCs makes it ideal for high-performance power electronics and motion control.
2. What is the difference between TMS320F28335 and TMS320F28335PGFA?
TMS320F28335 is the base device name, while TMS320F28335PGFA specifies the exact part number including package type (PGF = 176-pin LQFP) and temperature grade (A = industrial, –40°C to +125°C). In practice, "F28335" and "F28335PGFA" often refer to the same 176-pin industrial-grade device.
3. How much flash memory does the TMS320F28335PGFA have?
The TMS320F28335PGFA has 512 KB (256K × 16-bit words) of on-chip flash memory with ECC protection, plus 68 KB (34K × 16) of SRAM. The flash is in-system programmable via JTAG or the built-in bootloader.
4. Does the TMS320F28335 have a floating-point unit?
Yes. The TMS320F28335PGFA integrates an IEEE 754 single-precision floating-point unit (FPU) that operates in parallel with the C28x CPU. This allows native execution of floating-point arithmetic instructions, eliminating the need for fixed-point scaling and significantly simplifying control algorithm development.
5. What is the maximum clock speed of TMS320F28335PGFA?
The TMS320F28335PGFA operates at a maximum CPU clock frequency of 150 MHz, corresponding to a 6.67 ns instruction cycle time. The ePWM modules can run at the full SYSCLKOUT rate for maximum PWM resolution.
6. How many PWM channels does the TMS320F28335 have?
The TMS320F28335PGFA features 18 enhanced PWM (ePWM) outputs organized as 6 ePWM modules with 3 outputs each. Each ePWM module supports dedicated time-base, compare, action-qualifier and dead-band submodules. Channels 1–6 also support high-resolution PWM (HRPWM) with 150 ps step size.
7. What ADC specifications does the TMS320F28335PGFA offer?
The TMS320F28335PGFA includes two 12-bit successive-approximation ADC modules. Each ADC supports up to 16 input channels and achieves an 80 ns conversion time. The ADCs can operate independently or be synchronized for simultaneous sampling, which is critical for three-phase current and voltage measurements in motor and power conversion applications.
8. Is the TMS320F28335PGFA suitable for digital power supply design?
Absolutely. The TMS320F28335PGFA is one of the most popular DSCs for digital power design. Its floating-point unit, high-resolution PWMs, fast ADCs and analog comparators provide everything needed to implement digitally controlled SMPS topologies such as PFC, LLC, phase-shifted full-bridge and bidirectional DC/DC converters. TI also provides extensive digital power reference designs based on this device.
9. What communication interfaces are available on TMS320F28335PGFA?
The TMS320F28335PGFA integrates 2 CAN 2.0B controllers, 3 SCI/UART ports, 2 SPI ports, 1 I2C port, and 2 McBSP channels. This broad interface portfolio supports industrial fieldbuses (CANopen, DeviceNet), serial communication with sensors and displays, and multi-master system architectures.
10. What are the pin-compatible alternatives to TMS320F28335PGFA?
Pin-compatible alternatives in the same 176-pin PGF package include the TMS320F28334 (256 KB flash), TMS320F28332 (128 KB flash) for cost-optimized variants, and the TMS320F28235 (fixed-point, no FPU). For higher performance, the TMS320F28377D or F28379D offer dual-core architecture and 16-bit ADCs but are not pin-compatible and require a board redesign.