Texas Instruments TMS320F28066UPNT

Overview

TMS320F28066UPNT from Texas Instruments is a 90-MHz C28x-core real-time microcontroller with integrated FPU, CLA, and advanced motor control peripherals including 14 ePWM channels (7 HRPWM-capable), 3 eCAP modules, 2 eQEP modules, and a 12-bit 3.46-MSPS ADC - designed for closed-loop digital power and motor drive applications such as solar inverters and servo drives.

For engineers reviewing the TMS320F28066UPNT datasheet, TMS320F28066UPNT pinout, TMS320F28066UPNT application, or TMS320F28066UPNT equivalent, key selection criteria include CPU clock speed, on-chip memory size (64KB Flash / 50KB RAM), peripheral integration (eCAN, USB 2.0, dual SCI/UART), thermal grade (–40°C to 105°C), and package compatibility (80-pin LQFP PN).

Technical Context

The TMS320F28066UPNT implements a Harvard-architecture C28x CPU with atomic instruction execution and unified memory mapping, coupled with a dedicated 32-bit floating-point CLA that runs independently of the main CPU to offload real-time control loops. Its VCU extends instruction set support for complex math, CRC, and Viterbi operations.

Peripherals are organized via a hierarchical bus structure: 32-bit peripheral bus for high-bandwidth modules (ePWM, ADC, CLA), 16-bit peripheral bus for legacy interfaces (SCI, SPI), and DMA-accessible memory-mapped registers enabling zero-overhead data transfers between ADC results and PWM shadow registers.

Key Specifications

Pinout & Package

Package: 80-pin Low-Profile Quad Flatpack (LQFP), PN variant, 12.0 mm × 12.0 mm body size, no PowerPAD thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar real-time motor control applications.

Compared with TMS320F28069PZP and TMS320F280049CPT, the TMS320F28066UPNT delivers optimized cost-performance for mid-tier industrial motor drives where 64KB Flash and 80-pin LQFP fit mechanical constraints, while retaining essential real-time peripherals and security features.

Availability

TMS320F28066UPNT is available at Aetrix Electronics and suitable for solar inverter control, EV on-board charger design, and industrial AC-DC power supply development requiring stable component supply and long-term industrial temperature operation.

Supply support for TMS320F28066UPNT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The TMS320F28066UPNT belongs to TI's C2000™ real-time MCU family, engineered specifically for deterministic closed-loop control in digital power, motor drive, and energy conversion systems - emphasizing low-latency peripheral response, on-chip analog integration, and computational efficiency for control-law execution.

FAQ

What is the maximum operating frequency of the TMS320F28066UPNT?

The TMS320F28066UPNT operates at a maximum CPU frequency of 90 MHz, corresponding to an 11.11-ns instruction cycle time. This speed is achieved using an internal PLL with programmable multiplication factors and supported by two on-chip zero-pin oscillators or external crystal/clock inputs. All timing-critical peripherals - including ePWM, ADC, and CLA - are synchronized to this clock domain.

Does the TMS320F28066UPNT include a floating-point unit?

Yes, the TMS320F28066UPNT integrates a native single-precision floating-point unit (FPU) as part of its C28x CPU core. This enables efficient execution of floating-point arithmetic in C/C++ without software emulation, significantly accelerating mathematical operations used in motor control algorithms such as Park/Clarke transforms and PI controllers within the TMS320F28066UPNT firmware.

How many PWM channels does the TMS320F28066UPNT support?

The TMS320F28066UPNT supports 14 enhanced PWM (ePWM) output channels across 7 modules, with 8 of those channels capable of high-resolution PWM (HRPWM) operation. Each ePWM module includes independent 16-bit timers, dead-band generation, and trip-zone inputs - enabling robust gate-drive control for three-phase inverters and resonant topologies in the TMS320F28066UPNT-based designs.

What communication interfaces are available on the TMS320F28066UPNT?

The TMS320F28066UPNT provides two SCI/UART modules, two SPI modules, one I²C bus, one enhanced CAN (eCAN) controller with 32 mailboxes, and one USB 2.0 interface supporting full-speed device and host modes. These interfaces allow the TMS320F28066UPNT to connect to host processors, sensors, gate drivers, and external debug tools without requiring additional protocol translators.

Is the TMS320F28066UPNT pin-compatible with other F2806x devices?

No, the TMS320F28066UPNT is not universally pin-compatible across the F2806x family. It uses the 80-pin LQFP (PN) package, whereas variants like TMS320F28069PZP use 100-pin HTQFP (PZP) with PowerPAD. Pin assignments differ between PN and PZ/PZP packages, and peripheral availability (e.g., USB, HRCAP count) varies by part number - requiring careful validation of signal routing and footprint when substituting the TMS320F28066UPNT.