Texas Instruments F28M35E20B1RFPT

Overview

F28M35E20B1RFPT from Texas Instruments is a dual-core Concerto™ microcontroller integrating an Arm® Cortex®-M3 master subsystem (60 MHz) and a TMS320C28x real-time control subsystem (60 MHz), with 256KB flash (ECC), 32KB RAM (ECC/parity), dual 12-bit ADCs (2.31 MSPS, 20 channels), six comparators with integrated DACs, and two D-CAN modules. It targets high-precision motor control and power conversion systems requiring synchronized communication and deterministic timing.

For engineers reviewing the F28M35E20B1RFPT datasheet, F28M35E20B1RFPT pinout, F28M35E20B1RFPT application, or F28M35E20B1RFPT equivalent, this page delivers verified core speeds, ADC performance, CAN interface capability, thermal package details, and validated alternative part options for industrial inverter and servo drive design.

Technical Context

The F28M35E20B1RFPT implements a tightly coupled dual-core architecture where the Cortex-M3 handles Ethernet, USB OTG, UART, I²C, and SSI communications while the C28x CPU executes real-time PWM generation (9 ePWM modules, 18 outputs), encoder capture (3 eQEP), and analog acquisition (dual ADCs with shared sample-and-hold). Interprocessor communication occurs via 32-channel IPC with 2KB message RAM and hardware handshaking.

Its clocking supports independent PLLs for each subsystem: the M3 runs at 60 MHz (divided from 240 MHz PLL), and the C28x at 60 MHz (divided from same PLL), maintaining integer clock ratios required for ADC synchronization. Power domains are segregated-1.2-V digital, 1.8-V analog, and 3.3-V I/O-with dedicated VDDA1/VDDA2 and VSSA1/VSSA2 pins for noise isolation.

Key Specifications

Pinout & Package

144-pin RFP PowerPAD™ Thermally Enhanced Thin Quad Flatpack (HTQFP) with exposed thermal pad soldered to PCB ground plane for optimal thermal dissipation and digital ground integrity. Pin 1 marked by corner notch; top view orientation per Figure 6-1 in SPRS742L.

Key Features

Applications

Equivalent & Alternatives

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

Compared with F28M35E20B1RFPT, F28M35M22CRFPT offers identical real-time control capability at lower cost but sacrifices shared memory bandwidth, while F28M35H22CRFPT adds communication features that increase BOM complexity without benefit in isolated motor control designs.

Availability

F28M35E20B1RFPT is available at Aetrix Electronics and suitable for AC drive control module, servo drive control module, and string inverter applications requiring stable component supply, long-term industrial lifecycle support, and automotive-grade thermal reliability.

Supply support for F28M35E20B1RFPT 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 specializing in analog, embedded processing, and digital signal processing technologies with decades of industrial MCU heritage.

The F28M35x Concerto™ family was designed to unify communication and real-time control on a single chip for solar inverters, motor drives, and industrial power systems - eliminating inter-processor latency and simplifying system architecture.

FAQ

What is the maximum operating frequency of each core in the F28M35E20B1RFPT?

The F28M35E20B1RFPT operates its Arm Cortex-M3 core at 60 MHz and its TMS320C28x core at 60 MHz. These frequencies are fixed per device variant and confirmed in Table 5-1 of SPRS742L. The dual-core clock ratio is locked to maintain integer division for ADC synchronization, and no higher speeds are supported on this specific part number.

Does the F28M35E20B1RFPT include Ethernet or USB functionality?

No, the F28M35E20B1RFPT does not include Ethernet 1588 or USB OTG peripherals. Per Table 5-1 in SPRS742L, those features are disabled in the E20B variant. It retains two D-CAN modules, five UARTs, four SSIs, two I²Cs, and SPI interfaces - sufficient for CANopen, Modbus RTU, and proprietary fieldbus implementations.

How much shared RAM does the F28M35E20B1RFPT provide between the two cores?

The F28M35E20B1RFPT provides 64KB of shared RAM (parity-protected), accessible by both the Cortex-M3 and C28x subsystems. This memory is used for IPC message passing, waveform buffers, and coordinated control data - distinct from the 2KB dedicated IPC message RAM also present on the device.

What analog peripherals are integrated into the F28M35E20B1RFPT?

The F28M35E20B1RFPT integrates dual 12-bit ADCs (2.31 MSPS aggregate, 20 channels total), four sample-and-hold circuits, and six analog comparators each with a 10-bit integrated DAC. All analog inputs are routed to dedicated VDDA/VSSA pins to ensure noise isolation from digital switching activity.

Is the F28M35E20B1RFPT pin-compatible with other F28M35x devices?

Yes, the F28M35E20B1RFPT uses the same 144-pin HTQFP (RFP PowerPAD™) package as other F28M35x variants including F28M35H52C, F28M35M52C, and F28M35H22C. Pin assignments for power, ground, GPIO, ADC, PWM, CAN, and debug interfaces are identical across the family, enabling hardware reuse with firmware adaptation.