Texas Instruments TMS320F28021DAT

Overview

TMS320F28021DAT from Texas Instruments is a 32-bit C28x real-time microcontroller optimized for 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), ePWM with HRPWM support, and integrated comparators. It serves as the core controller in compact inverter power stages and BLDC motor drives.

For engineers reviewing the TMS320F28021DAT datasheet, TMS320F28021DAT pinout, TMS320F28021DAT application, or TMS320F28021DAT equivalent, key selection criteria include its 38-pin TSSOP package, single 3.3-V supply operation, on-chip VREG, 20 GPIO pins, and compatibility with TI's InstaSPIN-FOC ecosystem for rapid motor control deployment.

Technical Context

The TMS320F28021DAT implements the C28x CPU core with Harvard architecture, atomic instructions, and unified memory model-enabling deterministic real-time execution in closed-loop control. Its peripheral set includes three 32-bit CPU timers, eight ePWM channels (four with high-resolution capability), one eCAP module, and dual analog comparators routed to PWM trip zones.

It integrates a 12-bit ADC with 7 input channels, dual sample-and-hold, and ratio-metric reference support (VREFHI/VREFLO), alongside serial interfaces: one SPI, one I²C, and one SCI (UART-compatible). Clocking relies on internal zero-pin oscillators or external crystal/XCLKIN, with watchdog and missing-clock detection for system robustness.

Key Specifications

Pinout & Package

38-pin Thin Shrink Small-Outline Package (TSSOP), body size 12.5 mm × 6.2 mm, lead pitch 0.65 mm, RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28021DAT, the TMS320F28022DAT offers higher performance and ADC bandwidth for demanding servo loops, while the TMS320F28023DAT adds pre-validated motor control IP-making it ideal for rapid prototyping where time-to-market outweighs minimal BOM cost savings.

Availability

TMS320F28021DAT is available at Aetrix Electronics and suitable for inverter & motor control, micro inverter, and AC-input BLDC motor drive applications requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across production batches.

Supply support for TMS320F28021DAT 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TMS320F28021DAT belongs to TI's C2000™ real-time microcontroller family, designed specifically for closed-loop control in power electronics-emphasizing deterministic timing, analog integration, and motor control acceleration.

FAQ

What is the maximum operating frequency of the TMS320F28021DAT?

The TMS320F28021DAT operates at a maximum CPU frequency of 40 MHz, corresponding to a 25-ns instruction cycle time. This speed is fixed for this variant-unlike higher-tier F2802x devices (e.g., F28027 at 60 MHz)-and is validated across the full industrial temperature range (–40°C to 105°C).

Does the TMS320F28021DAT include an integrated voltage regulator?

Yes, the TMS320F28021DAT includes an on-chip voltage regulator (VREG) that generates the internal 1.8-V supply from the single 3.3-V input. This eliminates external regulators and removes power sequencing requirements, simplifying board design and reducing BOM count.

How many PWM channels does the TMS320F28021DAT support?

The TMS320F28021DAT supports eight ePWM channels (ePWM1–ePWM4, each with A/B outputs), four of which (ePWM1A/2A/3A/4A) feature high-resolution capability (HRPWM) for sub-nanosecond timing control-critical for soft-switching topologies and resonant converters.

Is the TMS320F28021DAT pin-compatible with other F2802x devices in the DA package?

Yes, all 38-pin DA TSSOP variants in the F2802x family-including TMS320F28020DAT, TMS320F28021DAT, TMS320F28022DAT, and TMS320F28023DAT-share identical pinouts and package dimensions, enabling hardware reuse across performance tiers during design scaling.

What serial communication interfaces are available on the TMS320F28021DAT?

The TMS320F28021DAT integrates one Serial Communications Interface (SCI/UART), one Serial Peripheral Interface (SPI), and one Inter-Integrated Circuit (I²C) module-each with 4-level FIFOs. These support host MCU communication, sensor data acquisition, and configuration of external power ICs or gate drivers.