NXP Semiconductors FS32K146HRT0VLHT

Overview

FS32K146HRT0VLHT from NXP Semiconductors is an automotive-grade 32-bit Arm Cortex-M4F microcontroller with 2 MB flash, 256 KB SRAM (both with ECC), and dual 12-bit ADCs supporting up to 32 channels each. It operates at up to 112 MHz in HSRUN mode (−40 °C to +105 °C) and integrates FlexCAN with optional CAN-FD, LPUART/LIN, LPSPI, LPI2C, FlexIO, and CSEc cryptographic engine. It targets body control modules requiring ASIL-B functional safety compliance.

For engineers reviewing the FS32K146HRT0VLHT datasheet, FS32K146HRT0VLHT pinout, FS32K146HRT0VLHT application, or FS32K146HRT0VLHT equivalent, key selection considerations include its 100-pin LQFP package, HSRUN/RUN power mode switching requirement for CSEc/EEPROM operations, 156 GPIO capability, IEEE-1588 Ethernet readiness, and S32K1xx family-specific memory protection architecture using NXP's system MPU.

Technical Context

The FS32K146HRT0VLHT implements a dual-core capable architecture with Arm Cortex-M4F core (112 MHz HSRUN / 80 MHz RUN) and optional M0+ co-processor support per family spec, featuring integrated FPU, DSP extensions, and NVIC. Its clock system includes SOSC (4–40 MHz), FIRC (48 MHz), SIRC (8 MHz), LPO (128 kHz), and SPLL (up to 112 MHz), with dedicated TCLK (20 MHz) and SWD_CLK (25 MHz) domains.

Power management uses PMC-controlled modes-HSRUN, RUN, STOP, VLPR, VLPS-with strict operational constraints: CSEc execution and EEPROM write/erase are prohibited in HSRUN mode and require explicit transition to RUN mode (80 MHz). Memory subsystem includes ECC-protected 2 MB flash, 64 KB FlexNVM (with EEPROM emulation), 256 KB SRAM, 4 KB FlexRAM, and 4 KB code cache.

Key Specifications

Pinout & Package

FS32K146HRT0VLHT is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, 14 × 14 mm body size, and exposed thermal pad. This RoHS-compliant package supports reflow soldering and provides mechanical robustness for automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Compared with FS32K144HRT0VLHT, the FS32K146HRT0VLHT adds 1 MB flash, 64 KB SRAM, and second ADC-critical for feature-rich BCMs-while avoiding the Ethernet overhead and cost of FS32K148HRT0VLHT unless domain gateway functionality is required.

Availability

FS32K146HRT0VLHT is available at Aetrix Electronics and suitable for body control modules, advanced lighting systems, electric power steering support units, and domain gateway nodes requiring stable component supply across automotive production lifecycles.

Supply support for FS32K146HRT0VLHT 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in Arm-based MCUs and functional safety certification.

The S32K1xx product line delivers scalable, ASIL-B ready Arm Cortex-M microcontrollers optimized for automotive body electronics, chassis, and gateway applications-designed to simplify ISO 26262 compliance and reduce system-level safety validation effort.

FAQ

What is the maximum operating frequency of the FS32K146HRT0VLHT, and under what conditions is it valid?

The FS32K146HRT0VLHT achieves 112 MHz in HSRUN mode, validated across −40 °C to +105 °C ambient temperature. However, this frequency is incompatible with CSEc cryptographic operations or EEPROM writes/erases, which mandate a switch to 80 MHz RUN mode per NXP documentation. The device automatically asserts error flags if security or flash operations are attempted at 112 MHz.

Does the FS32K146HRT0VLHT support CAN-FD, and what configuration is required?

Yes, the FS32K146HRT0VLHT supports CAN-FD through its three FlexCAN modules, with at least one channel capable of FD operation per S32K1xx family specification. No additional silicon configuration is needed-CAN-FD is enabled via register settings in the FlexCAN controller; external CAN-FD transceivers and proper bus termination remain mandatory for physical layer compliance.

How does the memory protection unit (MPU) in the FS32K146HRT0VLHT differ from Arm's core MPU?

The FS32K146HRT0VLHT implements NXP's system MPU-not Arm's core MPU-located at the crossbar switch level. It enforces memory access rights for all masters (CPU, DMA, Ethernet), unlike Arm's core MPU which monitors only CPU-initiated accesses. This architecture enables broader safety partitioning across peripherals and is explicitly designed to meet ASIL-B requirements in automotive systems.

What are the thermal limits for the FS32K146HRT0VLHT in HSRUN versus RUN mode?

In HSRUN mode, the FS32K146HRT0VLHT is rated for −40 °C to +105 °C ambient temperature with a maximum junction temperature of 125 °C. In RUN mode, ambient extends to +125 °C with junction limit of 135 °C. These distinctions are enforced by hardware; exceeding ambient limits in HSRUN mode triggers thermal shutdown to prevent permanent damage.

Can the FS32K146HRT0VLHT execute secure boot from internal flash, and how is authenticity verified?

Yes, the FS32K146HRT0VLHT supports secure boot from internal flash using its Cryptographic Services Engine (CSEc). Authenticity is verified via SHA-256 hash comparison and AES-128 decryption of signed firmware images stored in protected flash regions. The CSEc performs root-of-trust validation before releasing the core from reset, ensuring only cryptographically signed code executes.