NXP Semiconductors FS32K146HRT0CLLT

Overview

FS32K146HRT0CLLT from NXP Semiconductors is an automotive-grade 32-bit Arm Cortex-M4F microcontroller with 2 MB flash, 256 KB SRAM (ECC), 112 MHz HSRUN operation, dual 12-bit ADCs (32-channel), and triple FlexCAN modules with optional CAN-FD support - deployed in engine control units and battery management systems requiring ASIL-B functional safety compliance.

For engineers reviewing the FS32K146HRT0CLLT datasheet, FS32K146HRT0CLLT pinout, FS32K146HRT0CLLT application, or FS32K146HRT0CLLT equivalent, key selection criteria include HSRUN-mode clocking constraints (no CSEc/EEPROM access at 112 MHz), -40 °C to 125 °C extended temperature rating, QuadSPI with HyperBus™ support, integrated CSEc security engine, and pin-to-pin compatibility across S32K14x LQFP-100 packages.

Technical Context

The FS32K146HRT0CLLT implements a dual-core architecture with Arm Cortex-M4F as primary execution core (112 MHz HSRUN) and Cortex-M0+ for low-power background tasks, sharing AXBS-Lite crossbar switch and eDMA controller. Its clock system integrates SPLL (up to 112 MHz), FIRC (48 MHz), SIRC (8 MHz), and LPO (128 kHz), enabling deterministic mode transitions between HSRUN, RUN, VLPR, VLPS, and STOP.

Safety-critical operation is enabled by hardware-level features including System MPU (crossbar-level memory protection), ECC on flash/SRAM, CRC module, internal WDOG and external EWM, and CSEc cryptographic engine - all validated per ISO 26262 up to ASIL-B. Memory subsystem includes 2 MB program flash with ECC, 64 KB FlexNVM for EEPROM emulation, and 4 KB FlexRAM configurable as SRAM or EEPROM backup.

Key Specifications

Pinout & Package

FS32K146HRT0CLLT is housed in a 100-pin LQFP package (14 × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow S32K14x family standard layout, supporting pin-to-pin compatibility across K142/K144/K146/K148 variants in same package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S32K148HRT0MLLT, FS32K146HRT0CLLT reduces system cost by omitting Ethernet/SAI while retaining identical CAN-FD, ADC, and security capabilities; versus MPC5748G, it delivers Arm-native development flow, smaller footprint, and superior energy efficiency for mid-tier automotive controllers.

Availability

FS32K146HRT0CLLT is available at Aetrix Electronics and suitable for engine control units, battery management systems, and electric power steering controllers requiring stable component supply across automotive production lifecycles.

Supply support for FS32K146HRT0CLLT 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 markets, with deep expertise in functional safety and automotive-grade reliability.

The S32K1xx product line was designed specifically for automotive body, chassis, and powertrain applications demanding ASIL-B compliance, robust EMC performance, and long-term supply stability - with FS32K146HRT0CLLT representing the flagship 2 MB flash variant in the M-grade temperature range.

FAQ

What is the maximum operating frequency of the FS32K146HRT0CLLT and under what conditions?

The FS32K146HRT0CLLT achieves a maximum operating frequency of 112 MHz in HSRUN mode, enabled by the System Phase-Locked Loop (SPLL) with external 8–40 MHz crystal input. This frequency is only supported within the -40 °C to +125 °C ambient temperature range and requires VDD between 2.7 V and 5.5 V. Notably, no write or erase access to CSEc or EEPROM is permitted at 112 MHz - FS32K146HRT0CLLT must transition to RUN mode (≤80 MHz) for secure memory operations.

Does the FS32K146HRT0CLLT support CAN-FD, and how many CAN interfaces does it include?

Yes, the FS32K146HRT0CLLT includes three FlexCAN modules, each capable of CAN-FD operation (ISO 11898-1) with data phase bit rates up to 5 Mbps. CAN-FD support is enabled via configuration registers and requires external transceivers compliant with ISO 11898-2/5. All three CAN modules are fully independent, supporting concurrent communication on separate vehicle networks - a key capability leveraged in FS32K146HRT0CLLT-based domain controllers.

What safety certifications apply to the FS32K146HRT0CLLT, and which hardware features enable them?

The FS32K146HRT0CLLT is qualified per ISO 26262 up to ASIL-B, supported by integrated hardware safety mechanisms including System MPU (crossbar-level memory protection), ECC on flash and SRAM, CRC module, dual watchdogs (WDOG + EWM), and CSEc cryptographic engine. These features are documented in the FS32K146HRT0CLLT Functional Safety Manual (FSM) and enable diagnostic coverage exceeding 90% for systematic faults - critical for FS32K146HRT0CLLT deployment in engine control and braking systems.

How does the memory architecture of the FS32K146HRT0CLLT support secure over-the-air (OTA) updates?

The FS32K146HRT0CLLT uses 2 MB program flash with ECC and a dedicated CSEc engine to authenticate and decrypt OTA firmware images. Secure boot validates ECDSA-signed images before execution; encrypted updates are decrypted in-place using AES-128 keys stored in protected CSEc memory. The FS32K146HRT0CLLT also supports dual-bank flash swapping to ensure fail-safe rollback - a requirement verified in FS32K146HRT0CLLT safety-certified bootloader implementations.

What is the pin count and package type of the FS32K146HRT0CLLT, and is it pin-compatible with other S32K14x devices?

The FS32K146HRT0CLLT uses a 100-pin LQFP package (14 × 14 mm, 0.5 mm pitch) with exposed thermal pad. It is fully pin-to-pin compatible with other S32K14x family members in the same LQFP-100 package, including S32K142HRT0CLLT, S32K144HRT0CLLT, and S32K148HRT0CLLT - enabling scalable design reuse across performance tiers without PCB redesign. This compatibility is explicitly confirmed in the S32K1xx Data Sheet Rev. 6, Section 2 (Feature Comparison).