Texas Instruments TMS320F28020PTT

Overview

TMS320F28020PTT 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, 3-channel 12-bit ADC (500 ns conversion time), ePWM with HRPWM support, and integrated comparators-used in AC-input BLDC motor drives and industrial AC-DC power stages.

For engineers reviewing the TMS320F28020PTT datasheet, TMS320F28020PTT pinout, TMS320F28020PTT application, or TMS320F28020PTT equivalent, key selection criteria include its 48-pin LQFP package, 3.3-V single-supply operation, -40°C to 105°C temperature range, and compatibility with C2000™ real-time control firmware stacks for digital power and motor drive designs.

Technical Context

The TMS320F28020PTT implements the fixed-point TMS320C28x CPU core with Harvard architecture, atomic instructions, and unified memory model-enabling deterministic execution for closed-loop control. It integrates a 3-channel 12-bit ADC with dual sample-and-hold, two analog comparators with internal 10-bit references, and four ePWM modules (each with independent 16-bit timer and high-resolution extension).

Clock management includes dual zero-pin oscillators, on-chip crystal oscillator (X1/X2), external clock input (XCLKIN), and PLL-based system clock generation. Power sequencing is eliminated via integrated voltage regulator supporting single 3.3-V rail operation, with POR/BOR circuitry and watchdog timer for robust system initialization and fault recovery.

Key Specifications

Pinout & Package

48-pin Low-Profile Quad Flatpack (LQFP), 7.0 mm × 7.0 mm body, 0.5-mm pitch, exposed thermal pad (not electrically connected). Pin functions validated per TI SPRS523P Rev P Figure 7-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28021PTT and TMS320F28022PTT, the TMS320F28020PTT offers the lowest-cost entry point in the F2802x LQFP family while retaining full HRPWM, comparator, and trip-zone functionality-ideal for cost-sensitive, single-axis motor control where flash/RAM headroom is sufficient.

Availability

TMS320F28020PTT is available at Aetrix Electronics and suitable for AC-input BLDC motor drives, industrial AC-DC power supplies, and micro-inverter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TMS320F28020PTT 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 specializing in analog, embedded processing, and digital signal processing technologies.

The TMS320F28020PTT belongs to the C2000™ Entry Performance MCU line, designed specifically for cost-optimized real-time control in digital power, motor drive, and industrial automation applications.

FAQ

What is the maximum operating frequency of the TMS320F28020PTT?

The TMS320F28020PTT operates at a maximum CPU frequency of 40 MHz, corresponding to a 25-ns instruction cycle time. This is fixed for the TMS320F28020 variant per TI's device comparison table (SPRS523P), and cannot be overclocked beyond this specification. The internal PLL derives SYSCLK from either the on-chip oscillator or external clock source, with configuration registers limiting valid dividers to maintain 40 MHz compliance. All timing-critical peripherals-including ADC, ePWM, and HRPWM-are characterized and guaranteed at this frequency.

Does the TMS320F28020PTT support hardware-based fault protection?

Yes, the TMS320F28020PTT supports hardware-accelerated fault protection through its trip-zone (TZ) module and integrated analog comparators. COMP1OUT and COMP2OUT can be routed directly to TZ1–TZ3 inputs, triggering immediate ePWM shutdown (<100 ns propagation delay) without CPU involvement. This capability is confirmed in the functional block diagram and signal descriptions of SPRS523P, and is used in production designs for IGBT desaturation detection and overcurrent cutoff in motor drives.

What are the analog input capabilities of the TMS320F28020PTT?

The TMS320F28020PTT features a 12-bit, 3-MSPS ADC with two independent sample-and-hold circuits and 14 total input channels (7 per group: ADCINA0–7 and ADCINB0–7). It supports ratio-metric referencing using VREFHI/VREFLO pins, and has a fixed full-scale range of 0–3.3 V. Conversion time is 500 ns, and the ADC interface is optimized for low-latency access via DMA or CPU polling-verified in Section 8.6 of SPRS523P.

Is the TMS320F28020PTT pin-compatible with other F2802x devices in the 48-pin LQFP package?

Yes, the TMS320F28020PTT shares identical pinout and package (48-pin PT LQFP) with all other F2802x variants in the same package-including TMS320F28021PTT, TMS320F28022PTT, TMS320F28023PTT, TMS320F28026PTT, and TMS320F28027PTT-as confirmed in TI's Device Information table and Figure 7-1 of SPRS523P. Peripheral pin assignments (ePWM, ADC, SCI, etc.) are functionally consistent across the family, enabling hardware reuse across performance tiers.

What debug interface does the TMS320F28020PTT support?

The TMS320F28020PTT supports IEEE 1149.1 JTAG debugging via five dedicated pins: TCK, TMS, TDI, TDO, and TRST (pins 38, 36, 35, 37, and 2 respectively in the 48-pin LQFP). These pins are multiplexed with GPIO functions but default to JTAG mode at reset. TI's C2000Ware and Code Composer Studio fully support real-time debug, breakpoint, and memory inspection through this interface-documented in Section 9.4 (Device Emulation Registers) and Section 8.9 of SPRS523P.