Texas Instruments TMS320F28021PTS

Overview

TMS320F28021PTS from Texas Instruments is a 32-bit C28x-core microcontroller optimized for real-time motor and power control, operating at 40 MHz (25-ns cycle time), featuring 8 kB flash, 3 kB SARAM, 12-bit ADC with 7 channels, 8 ePWM channels, and integrated comparators - deployed in AC-input BLDC motor drives and industrial AC-DC power stages.

For engineers reviewing the TMS320F28021PTS datasheet, TMS320F28021PTS pinout, TMS320F28021PTS application, or TMS320F28021PTS equivalent, key selection criteria include its 40-MHz deterministic C28x CPU, LQFP-48 package with 22 GPIOs, HRPWM-capable ePWM modules, on-chip VREG for single 3.3-V supply operation, and temperature rating of –40°C to 105°C (T-grade).

Technical Context

The TMS320F28021PTS implements a Harvard-architecture C28x CPU with atomic instructions and unified memory model, enabling deterministic real-time loop execution. Its clock system integrates dual zero-pin oscillators, crystal support via X1/X2, and PLL-based frequency synthesis - all managed through CLKCTL and XCLK registers.

Peripheral integration centers on closed-loop control: eight ePWM modules (four with high-resolution capability), two analog comparators with internal 10-bit references, and a 12-bit ADC with dual sample-and-hold supporting ratio-metric VREFHI/VREFLO referencing - all synchronized via EPWMSYNCI/EPWMSYNCO signals and routed through GPIO multiplexing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28022PT and TMS320F28023PT, the TMS320F28021PTS offers minimal cost-optimized control for fixed-function applications - trading flash size, ADC channels, and serial interfaces for lower BOM cost and smaller code footprint, while retaining identical ePWM/HRPWM and comparator functionality in the same LQFP-48 package.

Availability

TMS320F28021PTS is available at Aetrix Electronics and suitable for AC-input BLDC motor drive, industrial AC-DC power stage, and micro inverter applications requiring stable component supply across extended production lifecycles.

Supply support for TMS320F28021PTS 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, with leadership in signal chain and real-time control technologies.

The TMS320F2802x family belongs to TI's C2000™ real-time microcontroller portfolio, designed specifically for deterministic closed-loop control in motor drives, digital power, and energy conversion systems - emphasizing low-latency peripherals, analog integration, and code compatibility across generations.

FAQ

What is the maximum operating frequency of the TMS320F28021PTS?

The TMS320F28021PTS operates at a maximum CPU frequency of 40 MHz, corresponding to a 25-ns instruction cycle time. This speed is fixed per device variant and confirmed in the Device Comparison table (Table 6-1) of the SPRS523P datasheet. The 40-MHz rating applies across the full industrial temperature range (–40°C to 105°C) under recommended operating conditions (3.3-V supply).

Does the TMS320F28021PTS include a UART interface?

No, the TMS320F28021PTS does not include a Serial Communications Interface (SCI) UART peripheral. According to Table 6-1 in the SPRS523P datasheet, SCI is marked "0" for the TMS320F28021 variant. UART functionality is available only in higher variants such as TMS320F28022PT and TMS320F28023PT - making the TMS320F28021PTS suitable for cost-sensitive applications where host communication is handled externally or omitted.

How many high-resolution PWM channels does the TMS320F28021PTS support?

The TMS320F28021PTS supports four high-resolution PWM (HRPWM) channels - specifically ePWM1A, ePWM2A, ePWM3A, and ePWM4A - as documented in the Device Comparison table (Table 6-1) and Functional Block Diagram (Figure 4-1). Each HRPWM channel extends standard ePWM timing resolution to sub-nanosecond levels, enabling precise dead-time control essential for SiC and GaN power stages.

What analog input channels are available on the TMS320F28021PTS?

The TMS320F28021PTS features a 12-bit ADC with seven input channels (ADCINA0–ADCINA6), plus six additional channels on Group B (ADCINB2, ADCINB4, ADCINB6, ADCINB7), totaling 13 analog inputs. However, only seven Group A channels are accessible in the 48-pin PT package per pinout documentation (Figure 7-1), with ADCINB channels shared on AIO pins - confirming actual usable analog inputs as seven dedicated and six multiplexed, consistent with Table 6-1.

Is the TMS320F28021PTS pin-compatible with other F2802x devices in LQFP-48 packaging?

Yes, the TMS320F28021PTS shares identical pinout, package dimensions (7.0 mm × 7.0 mm), and footprint with other F2802x PT variants including TMS320F28022PT, TMS320F28023PT, and TMS320F28026PT - as verified in the Device Information table and Figure 7-1 (48-pin PT LQFP top view). This allows direct PCB reuse across the F2802x family when upgrading flash size, CPU speed, or peripheral count.