Texas Instruments TMS320F28020DAS

Overview

TMS320F28020DAS 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 ePWM modules with HRPWM support, 7-channel 12-bit ADC, and integrated comparators - deployed in AC-input BLDC motor drives and industrial AC-DC power stages.

For engineers reviewing the TMS320F28020DAS datasheet, TMS320F28020DAS pinout, TMS320F28020DAS application, or TMS320F28020DAS equivalent, key selection criteria include 40-MHz deterministic C28x execution, single 3.3-V supply operation, 38-pin TSSOP package footprint, on-chip VREG, and dual-comparator routing to PWM outputs for closed-loop analog control.

Technical Context

The TMS320F28020DAS implements a Harvard-architecture C28x CPU with atomic instructions and fast interrupt response, enabling sub-microsecond control loop execution. Its peripheral set includes three ePWM modules (each with independent 16-bit timer and high-resolution extension), one eCAP input, and a 12-bit ADC with dual sample-and-hold and ratio-metric reference support (VREFHI/VREFLO).

System-level timing is managed via dual zero-pin oscillators, on-chip crystal oscillator (X1/X2), and PLL-based clock synthesis. Power integrity is maintained by integrated POR/BOR circuitry and a single-rail 3.3-V regulator - eliminating external sequencing requirements while supporting –40°C to 125°C operation (S-grade).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28022DA and TMS320F28026DA, the TMS320F28020DAS offers the lowest-cost entry point for fixed-function motor control with verified thermal stability at 125°C - ideal for cost-optimized, volume-manufactured inverters where UART/I2C and extra flash are unnecessary.

Availability

TMS320F28020DAS is available at Aetrix Electronics and suitable for air conditioner outdoor units, micro inverters, and AC drive power stage modules requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for TMS320F28020DAS 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 TMS320F28020DAS belongs to the C2000™ Entry Performance MCU family, designed specifically for cost-sensitive real-time control tasks in motor drives, digital power, and energy conversion systems - emphasizing integration, thermal robustness, and deterministic execution.

FAQ

What is the maximum operating frequency of the TMS320F28020DAS?

The TMS320F28020DAS operates at a maximum CPU frequency of 40 MHz, corresponding to a 25-ns instruction cycle time. This speed is factory-configured and fixed for this variant - unlike higher-tier F2802x devices (e.g., F28027), it does not support 60 MHz operation. The 40-MHz clock is derived from the internal PLL locked to either the on-chip oscillator or an external crystal connected to X1/X2, and is validated across the full –40°C to +125°C temperature range.

Does the TMS320F28020DAS include a hardware watchdog timer?

Yes, the TMS320F28020DAS includes a dedicated watchdog timer module that monitors software execution integrity. When enabled, it must be periodically serviced via WDCR register writes; failure to do so triggers a system reset asserted on the XRS pin for 512 OSCCLK cycles. The watchdog uses its own clock domain independent of SYSCLK, ensuring reliable fault recovery even if the main CPU clock fails - a critical feature for industrial motor control safety compliance.

How many PWM outputs does the TMS320F28020DAS support, and what resolution is available?

The TMS320F28020DAS integrates three enhanced PWM (ePWM) modules (EPWM1–EPWM3), each providing two complementary outputs (e.g., EPWM1A/EPWM1B) for a total of six PWM signals. Each module includes a standard 16-bit timer and optional high-resolution extension (HRPWM) capable of 150-ps duty-cycle adjustment - enabling precise dead-time control and fine-grained modulation for SiC/GaN gate drivers in high-frequency power converters.

Is the TMS320F28020DAS pin-compatible with other F2802x family members in the same package?

Yes, the TMS320F28020DAS shares identical pinout and electrical characteristics with all other 38-pin DA TSSOP variants in the F2802x family (e.g., TMS320F28021DA, TMS320F28022DA, TMS320F28023DA). Signal assignments, power/ground locations, and JTAG interface pins are functionally identical - allowing direct PCB reuse across performance tiers when migrating from 40 MHz to 50/60 MHz variants without layout changes.

What analog peripherals are integrated into the TMS320F28020DAS?

The TMS320F28020DAS integrates a 12-bit, 7-channel ADC with dual sample-and-hold, two analog comparators with internal 10-bit DAC references, and an on-chip temperature sensor. The ADC supports ratio-metric operation using VREFHI/VREFLO pins and achieves 2 MSPS aggregate sampling. Both comparators route directly to ePWM trip-zone inputs (TZ1/TZ2), enabling hardware-fast overvoltage/overcurrent protection without CPU involvement - essential for IGBT/SiC short-circuit protection.