Texas Instruments F28M35E52B1RFPT

Overview

F28M35E52B1RFPT from Texas Instruments is a dual-core heterogeneous microcontroller integrating an ARM Cortex-M3 master core and a C28x DSP control core on a single die, featuring 512 KB on-chip flash, 132 KB RAM, and real-time PWM generation for motor and power control. It supports deterministic low-latency inter-processor communication (IPC), ECC-protected memory, and safety features including watchdog timers, missing clock detection, and PLL slip monitoring - deployed in industrial servo drives and digital power supplies.

For engineers reviewing the F28M35E52B1RFPT datasheet, F28M35E52B1RFPT pinout, F28M35E52B1RFPT application, or F28M35E52B1RFPT equivalent, key selection criteria include dual-core IPC latency, ePWM dead-band resolution, flash ECC coverage, C28x real-time interrupt response time, and package thermal performance under continuous 100°C ambient operation.

Technical Context

The F28M35E52B1RFPT implements a tightly coupled dual-subsystem architecture: the M3 core handles high-level system management, communications, and HMI, while the C28x core executes deterministic control loops with sub-100 ns interrupt latency and dedicated ePWM modules supporting up to 16-bit resolution, asymmetric dead-band, and trip-zone fault protection. Both subsystems share access to 64 KB MSGRAM with hardware semaphore support for atomic IPC flag exchange.

Clocking is managed via two independent PLLs - one for the M3 subsystem (up to 120 MHz) and one for the C28x subsystem (up to 150 MHz) - with configurable dividers, XCLKOUT output, and integrated missing-clock detection logic. Safety-critical peripherals include dual watchdog timers (one per core), ECC-enabled flash and RAM, and write-protected configuration registers enforced by the Code Security Module (CSM).

Key Specifications

Pinout & Package

Package: 176-pin Heat Sink Thermally Enhanced Thin Quad Flat Package (HTQFP-RFPT), 24 × 24 mm body, 0.5 mm pitch, exposed thermal pad (EPAD) on underside for PCB thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with F28M35E52B1RFPT, F28M36P63C1RFPT extends flash and adds CAN FD without changing footprint or safety architecture, while TMS320F28379DZWTT trades dual-core flexibility for higher PWM channel count and lower unit cost in single-domain control systems.

Availability

F28M35E52B1RFPT is available at Aetrix Electronics and suitable for industrial servo drives, digital AC/DC power supplies, grid-tied solar inverters, and uninterruptible power supplies requiring stable component supply across multi-year production cycles.

Supply support for F28M35E52B1RFPT 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and wireless technologies with over 90 years of innovation in industrial and automotive electronics.

The Concerto F28M35x product line was designed to unify system-level control and real-time deterministic processing in a single chip - targeting applications where ARM-based connectivity must coexist with DSP-grade motor/power loop performance without inter-chip latency or signal integrity loss.

FAQ

What is the maximum operating frequency of each core in the F28M35E52B1RFPT?

The F28M35E52B1RFPT operates its ARM Cortex-M3 core at up to 120 MHz and its TMS320C28x DSP core at up to 150 MHz. These frequencies are achieved using independent PLLs with configurable dividers, and both are validated across the full –40°C to 105°C temperature range. The F28M35E52B1RFPT datasheet specifies timing margins for all peripheral interfaces at these maximum speeds, including ePWM, SPI, and SCI modules.

Does the F28M35E52B1RFPT support CAN communication?

Yes, the F28M35E52B1RFPT integrates a single CAN 2.0B controller compliant with ISO 11898-1, supporting bit rates up to 1 Mbps and message filtering via 32 mailboxes. It does not support CAN FD. The CAN module is accessible exclusively to the C28x subsystem and shares DMA resources with other peripherals. Its physical layer interface requires an external transceiver such as the SN65HVD23x series.

How is inter-processor communication implemented in the F28M35E52B1RFPT?

The F28M35E52B1RFPT implements inter-processor communication via a 64 KB MSGRAM with hardware semaphore registers, 32 dedicated IPC flags, and MTOC/CTOM message registers. This architecture enables sub-microsecond latency for flag-based signaling and guaranteed atomic access to shared data - critical for synchronizing control loops between the M3 and C28x subsystems without software locks or polling overhead in the F28M35E52B1RFPT design.

What safety features are built into the F28M35E52B1RFPT?

The F28M35E52B1RFPT includes multiple hardware-enforced safety features: missing clock detection, PLLSLIP monitoring, dual independent watchdog timers (one per core), ECC protection for flash and RAM, register write protection via the Code Security Module (CSM), and µCRC acceleration for data integrity checks. These features are documented in the SPRUH22I Technical Reference Manual and are active at power-on reset - no software initialization required for basic fault detection in the F28M35E52B1RFPT.

Is the F28M35E52B1RFPT pin-compatible with other Concerto devices?

No, the F28M35E52B1RFPT is not pin-compatible with other Concerto family members such as the F28M36x series. While both use the 176-pin HTQFP (RFPT) package, pin functions differ significantly - for example, CAN and USB signals are reassigned, and certain GPIO multiplexing options change. Migration requires PCB layout revision and firmware adaptation; the F28M35E52B1RFPT pinout is unique to its specific memory and peripheral configuration.