NXP Semiconductors FS32K146HNT0VLLT

Overview

FS32K146HNT0VLLT from NXP Semiconductors is an automotive-grade 32-bit Arm Cortex-M4F microcontroller with 2 MB flash, 256 KB SRAM (both with ECC), 112 MHz HSRUN operation, and integrated CSEc security engine. It features dual 12-bit ADCs (32-channel total), three FlexCAN modules (CAN-FD capable), and operates from -40 °C to 105 °C in LQFP-100 package - deployed in vehicle body control modules requiring functional safety up to ASIL-B.

For engineers reviewing the FS32K146HNT0VLLT datasheet, FS32K146HNT0VLLT pinout, FS32K146HNT0VLLT application, or FS32K146HNT0VLLT equivalent, key selection considerations include HSRUN/RUN mode switching constraints for CSEc/EEPROM operations, FlexCAN FD channel count per package, LQFP-100 I/O allocation (up to 81 GPIO), and voltage range compliance (2.7–5.5 V) across ambient temperature extremes.

Technical Context

The FS32K146HNT0VLLT implements a dual-core architecture with Arm Cortex-M4F as primary execution core (112 MHz HSRUN, 80 MHz RUN) and optional M0+ for low-power background tasks. Its AXBS-Lite crossbar switch enables concurrent access to flash, SRAM, and peripherals by CPU, DMA, and Ethernet MAC, while NXP's system MPU enforces memory protection at the bus level - distinct from Arm Core MPU - supporting ASIL-B safety goals.

Power management includes five modes (HSRUN, RUN, STOP, VLPR, VLPS), with strict operational restrictions: CSEc cryptographic operations and FlexNVM EEPROM emulation are prohibited in HSRUN mode and require explicit transition to RUN mode (80 MHz). Clocking combines SOSC (4–40 MHz), FIRC (48 MHz), SIRC (8 MHz), LPO (128 kHz), and SPLL (up to 112 MHz), with independent TCLK (20 MHz) and SWD_CLK (25 MHz) domains for debug timing isolation.

Key Specifications

Pinout & Package

FS32K146HNT0VLLT is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the S32K14x IO Signal Description multiplexing sheet; all pins support configurable pull-up/down, slew rate control, and interrupt capability. Power supply pins include dedicated VDD/VDDA pairs with strict ≤0.1 V differential tolerance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FS32K144HFT0VLQT, FS32K146HNT0VLLT adds one FlexCAN FD channel and doubles flash/SRAM - enabling richer diagnostic logging and multi-bus redundancy. Against FS32K148HFT0MLQT, it omits Ethernet/SAI to reduce BOM cost and power while retaining full CAN-FD and security capability for non-gateway roles.

Availability

FS32K146HNT0VLLT is available at Aetrix Electronics and suitable for automotive body control, electric power steering, ADAS sensor hubs, and domain gateway applications requiring stable component supply across extended product lifecycles.

Supply support for FS32K146HNT0VLLT 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 MCUs.

The S32K1xx family - including FS32K146HNT0VLLT - was designed specifically for automotive electronic control units requiring ASIL-B compliance, robust security (CSEc), and real-time performance in harsh environments.

FAQ

What is the maximum operating frequency of the FS32K146HNT0VLLT, and under what conditions?

The FS32K146HNT0VLLT achieves 112 MHz in HSRUN mode for peak computational throughput, but this mode prohibits CSEc security operations and FlexNVM EEPROM writes. For those functions, the device must operate in RUN mode at 80 MHz. The 112 MHz rating applies only when voltage (2.7–5.5 V) and ambient temperature (-40 °C to 105 °C) remain within specified limits, and thermal design maintains junction temperature ≤125 °C.

Does the FS32K146HNT0VLLT support CAN-FD, and how many interfaces are available?

Yes, the FS32K146HNT0VLLT integrates three FlexCAN modules, each compliant with ISO 11898-1:2015 and capable of CAN-FD operation (up to 5 Mbps data phase). All three are accessible in the LQFP-100 package, with dedicated TX/RX pins and configurable bit timing - enabling redundant CAN-FD buses or mixed classical/CAN-FD network topologies without external controllers.

How does the CSEc (Cryptographic Services Engine) function in the FS32K146HNT0VLLT, and what are its limitations?

The CSEc in FS32K146HNT0VLLT implements SHE-compliant AES-128/256, SHA-256, RSA-2048, and key derivation functions for secure boot, OTA updates, and secure communication. However, CSEc execution is strictly forbidden in HSRUN mode (112 MHz); the device must switch to RUN mode (80 MHz) before initiating any CSEc command - a hardware-enforced constraint documented in the S32K1xx Data Sheet Rev. 15.

What memory protection mechanisms are implemented in the FS32K146HNT0VLLT?

The FS32K146HNT0VLLT uses NXP's system MPU - a crossbar-level memory protection unit that assigns granular read/write/execute permissions to each master (CPU, DMA, Ethernet) for every protected memory region. Unlike Arm Core MPU, this implementation enforces access control at the AXBS-Lite interconnect, satisfying ASIL-B isolation requirements for safety-critical partitions without relying on core-internal mechanisms.

Is the FS32K146HNT0VLLT pin-compatible with other S32K1xx devices in the same package?

Yes, all S32K1xx devices sharing the LQFP-100 package - including FS32K144HFT0VLQT and FS32K148HFT0MLQT - are pin-to-pin compatible per the S32K1xx Data Sheet Figure 3. Peripheral availability (e.g., third FlexCAN, QuadSPI) depends on internal silicon configuration and is enabled/disabled via software configuration registers, not pin mapping.