Texas Instruments TMS320F28068MPNT

Overview

TMS320F28068MPNT from Texas Instruments is a C2000™ real-time microcontroller optimized for digital power conversion and motor control. It integrates a 90-MHz C28x CPU, 256 KB flash, 50 KB RAM, six ePWM modules with high-resolution extensions (HRPWM), two HRCAP modules, and analog signal chain including 12-bit ADC with 3.5-MSPS sampling rate and dual 12-bit DACs. It targets closed-loop control in AC inverters, DC/DC converters, and servo drives.

For engineers reviewing the TMS320F28068MPNT datasheet, TMS320F28068MPNT pinout, TMS320F28068MPNT application, or TMS320F28068MPNT equivalent, key selection criteria include HRPWM resolution (150-ps step), ADC timing accuracy under PWM synchronization, on-chip VREG stability across temperature, and boot ROM support for eCAN/SPI/SCI firmware loading without external host.

Technical Context

The TMS320F28068MPNT implements a deterministic real-time architecture centered on the C28x 32-bit CPU core with IEEE 754-compatible FPU and IQmath library acceleration. Its clock system includes an internal oscillator, PLL with 1–15× multiplier, and multiple low-power modes managed by the System Control module.

Peripheral integration follows TI's C2000 real-time control paradigm: ePWM modules support independent dead-band, trip-zone, and phase-shift control; HRCAP enables sub-nanosecond edge capture for resonant converter timing; and the ADC features hardware synchronization to PWM events with configurable sample window alignment.

Key Specifications

Pinout & Package

Package: PT (TQFP-64), thermally enhanced quad flat pack with exposed thermal pad, RoHS-compliant, JEDEC MO-220 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28068MPNT, the TMS320F28069MPNT offers more on-chip RAM for advanced control algorithms without changing layout or firmware architecture, while the TMS320F280039CPNQ delivers higher CPU throughput and CLA acceleration at the expense of HRCAP-level timing resolution - making it suitable for new designs where resonant converter timing is handled externally.

Availability

TMS320F28068MPNT is available at Aetrix Electronics and suitable for digital power supplies, motor drives, and renewable energy inverters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and voltage ranges.

Supply support for TMS320F28068MPNT 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 personal electronics markets since 1930.

The TMS320F2806x series belongs to TI's C2000™ real-time microcontroller portfolio, designed specifically for deterministic control of power electronics - emphasizing high-resolution PWM, precision analog capture, and on-chip mathematical acceleration for digital power and motor control.

FAQ

What is the maximum operating frequency of the TMS320F28068MPNT CPU core?

The TMS320F28068MPNT features a C28x 32-bit CPU core rated for up to 90 MHz operation. This frequency is supported across the full industrial temperature range (–40°C to 125°C) when powered with nominal 1.8-V core voltage and 3.3-V I/O voltage. The CPU includes a single-cycle 32×32-bit MAC unit and IEEE 754-compatible floating-point unit, enabling real-time execution of complex control laws such as field-oriented control and predictive current regulation without external coprocessors.

Does the TMS320F28068MPNT include hardware support for secure firmware updates?

Yes, the TMS320F28068MPNT includes a Code Security Module (CSM) that supports 128-bit password protection of on-chip flash memory. When enabled, CSM prevents unauthorized readback or overwrite of secured sectors and enforces strict access control via EALLOW/EDIS privilege gates. Combined with the on-chip boot ROM supporting eCAN, SPI, and SCI firmware loading, the TMS320F28068MPNT enables authenticated, encrypted field updates without exposing decrypted code in external memory or requiring external security ICs.

How many high-resolution PWM channels does the TMS320F28068MPNT provide?

The TMS320F28068MPNT provides six ePWM modules, each extendable with High-Resolution PWM (HRPWM) capability. Each HRPWM channel achieves 150-ps resolution through digital dithering and analog delay line calibration, allowing sub-nanosecond duty-cycle adjustment. All six modules operate independently with configurable phase offsets, dead-band, and trip-zone responses - sufficient to control full-bridge, interleaved, and multi-phase topologies such as three-level NPC inverters or dual-output LLC converters.

Can the TMS320F28068MPNT perform synchronized ADC sampling with PWM events?

Yes, the TMS320F28068MPNT supports hardware-triggered ADC conversions synchronized to ePWM time-base events (e.g., TBCTR = 0 or TBCTR = CMPA). Up to 16 ADC start-of-conversion (SOC) sources can be mapped to different ePWM modules and timer events, with programmable pre-scale and qualification. This eliminates software-induced jitter and ensures sampling occurs at precise points in the switching cycle - critical for current reconstruction in shunt-based motor drives and voltage feedforward in resonant converters.

What is the purpose of the HRCAP module in the TMS320F28068MPNT?

The HRCAP (High-Resolution Capture) module in the TMS320F28068MPNT provides two independent input capture channels with 125-ps timestamp resolution. It is designed to measure extremely short time intervals - such as zero-crossing delays in resonant tanks, encoder pulse widths, or gate driver propagation skew - without CPU intervention. Each HRCAP channel includes its own prescaler, interrupt flag, and counter register, enabling autonomous timing acquisition that feeds directly into control loop calculations for adaptive frequency modulation in ZVS full-bridge or LLC converters.