Texas Instruments F28M35E50B1RFPQ

Overview

F28M35E50B1RFPQ from Texas Instruments is a dual-core heterogeneous microcontroller integrating an ARM Cortex-M3 master processor and a C28x DSP control subsystem on a single die, featuring 512 KB on-chip flash, 132 KB RAM, and real-time PWM peripherals for motor and power control. It operates at up to 100 MHz (M3) and 150 MHz (C28x), supports IEEE 754 single-precision floating-point, and targets closed-loop digital power supplies and servo drives.

For engineers reviewing the F28M35E50B1RFPQ datasheet, F28M35E50B1RFPQ pinout, F28M35E50B1RFPQ application, or F28M35E50B1RFPQ equivalent, key selection criteria include dual-core IPC latency, ePWM dead-band resolution, flash ECC support, and C28x real-time interrupt response under 35 ns.

Technical Context

The F28M35E50B1RFPQ implements tightly coupled inter-processor communication via MSGRAMs and hardware IPC flags, enabling deterministic message passing between M3 and C28x cores with sub-100 ns flag-set latency. Its clock architecture includes independent PLLs for each subsystem, with configurable dividers supporting asynchronous operation at 100 MHz (M3) and 150 MHz (C28x).

Safety-critical features include write-protected registers, missing-clock detection, PLLSLIP monitoring, dual watchdog timers (one per core), and ECC protection for both flash (SEC-DED) and RAM (single-bit correction/double-bit detection). The µCRC module supports programmable polynomials for firmware integrity verification.

Key Specifications

Pinout & Package

Package: 176-pin HTQFP (RFP), thermally enhanced, with exposed thermal pad. Pinout conforms to TI's Concerto F28M35x family pin compatibility across RFP packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with F28M35E50B1RFPQ, the F28M36P63C1RFPQ offers expanded memory and crypto support at the cost of USB functionality, while the TMS320F28379DPTP delivers higher pure DSP performance in a non-heterogeneous architecture-making F28M35E50B1RFPQ optimal for balanced real-time control + connectivity workloads.

Availability

F28M35E50B1RFPQ is available at Aetrix Electronics and suitable for industrial motor drives, digital power supplies, renewable energy inverters, and automotive onboard chargers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for F28M35E50B1RFPQ 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, designing and manufacturing analog, embedded processing, and wireless chips for industrial, automotive, and consumer markets.

The Concerto F28M35x product line was developed to unify real-time control and system-level connectivity in a single chip-enabling deterministic motor/power control (C28x) alongside protocol stacks, HMI, and cloud interfaces (ARM M3).

FAQ

What is the maximum operating frequency of each core in the F28M35E50B1RFPQ?

The F28M35E50B1RFPQ features two independent clock domains: the ARM Cortex-M3 core runs at up to 100 MHz, while the TMS320C28x DSP core operates at up to 150 MHz. These frequencies are supported simultaneously with independent PLLs and voltage regulators, enabling true heterogenous real-time execution without clock contention. Both cores maintain full instruction throughput at their rated speeds, as verified in TI's SPRUH22I Technical Reference Manual.

Does the F28M35E50B1RFPQ support hardware-based inter-processor communication?

Yes, the F28M35E50B1RFPQ includes dedicated hardware IPC resources: 32-bit mailboxes with automatic acknowledgment, 32 hardware flags with interrupt capability, and semaphores for resource arbitration. These features enable deterministic, low-latency communication between the M3 and C28x subsystems-critical for time-sensitive control tasks. All IPC registers are documented in sections 1.12 and 1.13.11–1.13.13 of the SPRUH22I manual.

What safety features are integrated into the F28M35E50B1RFPQ?

The F28M35E50B1RFPQ integrates multiple hardware safety mechanisms: write-protection locks on critical registers, missing-clock detection, PLLSLIP monitoring, dual independent watchdog timers (one per core), ECC protection for flash and RAM, and µCRC for firmware integrity. These features collectively support functional safety development targeting IEC 61508 SIL-2 and ISO 26262 ASIL-B decomposition, as outlined in TI's Concerto Safety Manual SPRUIK2.

Can the F28M35E50B1RFPQ boot from external SPI flash?

Yes, the F28M35E50B1RFPQ supports booting from external SPI flash via its built-in M-Boot ROM. When configured in SPI boot mode (GPIO pins set at reset), the M3 core loads initial firmware from an external SPI device using standard quad-SPI commands. This capability is fully implemented in factory ROM and requires no user code-details are specified in Section 6.3.1 and 6.5.15 of SPRUH22I.

What is the resolution and accuracy of the on-chip ADC in the F28M35E50B1RFPQ?

The F28M35E50B1RFPQ integrates a 12-bit, 3.5-MSPS analog-to-digital converter with dual sample-and-hold circuits, 16-channel analog input multiplexer, and hardware averaging (up to 16 samples). Typical INL is ±0.5 LSB and SNR is 69 dB at 100 kHz input, enabling precise current/voltage sensing in motor control and power conversion. Full specifications appear in Section 5.3 of the SPRUH22I manual.