Texas Instruments TMS320F28021PTT

Overview

TMS320F28021PTT from Texas Instruments is a 32-bit C28x-core microcontroller optimized for real-time motor control and digital power applications, operating at 40 MHz (25-ns cycle time), featuring 8 kB flash, 3 kB SARAM, 3-channel 12-bit ADC (500 ns conversion time), 8 ePWM channels with HRPWM support, and integrated comparators. It targets compact inverter power stages and BLDC motor drives requiring deterministic timing and analog integration.

For engineers reviewing the TMS320F28021PTT datasheet, TMS320F28021PTT pinout, TMS320F28021PTT application, or TMS320F28021PTT equivalent, key selection criteria include its 48-pin LQFP package, 40-MHz CPU speed, on-chip VREG enabling single 3.3-V supply operation, HRPWM dual-edge modulation capability, and compatibility with TI's InstaSPIN-FOC ecosystem for rapid motor control deployment.

Technical Context

The TMS320F28021PTT implements the C28x CPU core with Harvard bus architecture, atomic operations, and unified memory model-enabling efficient C/C++ execution and fast interrupt response. Its peripheral set includes three 32-bit CPU timers, PIE-interrupt expansion, and dedicated ePWM modules with independent 16-bit timers per channel.

It integrates analog functions directly tied to control loops: two analog comparators (COMP1A/B, COMP2A/B) with internal 10-bit references, routable to PWM trip zones; a 7-channel 12-bit ADC with dual sample-and-hold and ratio-metric reference support (VREFHI/VREFLO); and an on-chip temperature sensor-all synchronized to the real-time control subsystem.

Key Specifications

Pinout & Package

Package: 48-pin Low-Profile Quad Flatpack (LQFP), body size 7.0 mm × 7.0 mm, lead pitch 0.5 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28022PTT and TMS320F28023PTT, the TMS320F28021PTT offers cost-optimized entry-level performance with sufficient resources for single-motor sensored FOC or basic digital power control-retaining full software compatibility while reducing flash and ADC channel count.

Availability

TMS320F28021PTT is available at Aetrix Electronics and suitable for inverter & motor control, air conditioner outdoor units, and micro inverter designs requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

Supply support for TMS320F28021PTT 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 delivering analog and embedded processing solutions for industrial, automotive, and consumer applications.

The TMS320F28021PTT belongs to TI's C2000™ real-time microcontroller product line, designed specifically for closed-loop control in power electronics, motor drives, and energy systems-emphasizing deterministic timing, analog integration, and code efficiency.

FAQ

What is the maximum operating frequency of the TMS320F28021PTT?

The TMS320F28021PTT operates at a maximum CPU frequency of 40 MHz, corresponding to a 25-ns instruction cycle time. This speed is fixed for the TMS320F28021 variant and is confirmed in TI's SPRS523P datasheet Table 6-1. The device does not support dynamic frequency scaling; clock configuration is set at boot via PLL and system clock control registers. All timing-critical peripherals-including ePWM, ADC, and HRPWM-are synchronized to this 40-MHz SYSCLK.

Does the TMS320F28021PTT support hardware-based motor control features like HRPWM and comparator-to-PWM trip zones?

Yes, the TMS320F28021PTT includes hardware-accelerated motor control features: four HRPWM channels (EPWM1A/2A/3A/4A) enabling sub-nanosecond edge placement, and two analog comparators (COMP1 and COMP2) with outputs directly routable to ePWM trip-zone inputs. These features allow cycle-by-cycle overcurrent protection and precise dead-time management without CPU intervention-critical for SiC/GaN-based inverter designs.

What memory resources are available on the TMS320F28021PTT?

The TMS320F28021PTT integrates 8 kB of on-chip flash memory (16-bit words), 3 kB of zero-wait-state SARAM, 1 kB of OTP memory, and an 8 kB boot ROM containing flash API routines. Flash and SARAM are protected by the code-security module with 128-bit encryption key. No external memory interface is provided-the architecture relies on internal memory for deterministic real-time execution.

Is the TMS320F28021PTT pin-compatible with other F2802x family members in the 48-pin LQFP package?

Yes, the TMS320F28021PTT shares identical pinout, electrical characteristics, and package dimensions (48-pin PT LQFP, 7.0 mm × 7.0 mm) with TMS320F28022PTT, TMS320F28023PTT, TMS320F28026PTT, and TMS320F28027PTT. This allows direct PCB reuse across the F2802x family-software and layout can be scaled upward in performance or memory without hardware redesign.

What analog peripherals are integrated into the TMS320F28021PTT?

The TMS320F28021PTT integrates a 12-bit, 7-channel ADC with 500 ns conversion time and dual sample-and-hold; two analog comparators (COMP1 and COMP2) with internal 10-bit references; an on-chip temperature sensor; and dedicated analog supply pins (VDDA/VSSA). All analog inputs are referenced to the 3.3-V supply, supporting ratio-metric measurements using VREFHI/VREFLO. COMP2 is available only on the 48-pin PT package.