NXP Semiconductors SPC5746CK1MKU2

Overview

SPC5746CK1MKU2 from NXP Semiconductors is a dual-core automotive microcontroller featuring a 160 MHz e200z4 CPU and an 80 MHz e200z2 CPU, 3 MB on-chip flash, 384 KB SRAM with end-to-end ECC, and integrated FlexCAN FD (8 channels), Ethernet AVB/1588, and dual-channel FlexRay. It targets ASIL-B safety-critical powertrain and chassis control units.

For engineers reviewing the SPC5746CK1MKU2 datasheet, SPC5746CK1MKU2 pinout, SPC5746CK1MKU2 application, or SPC5746CK1MKU2 equivalent, key selection criteria include dual-core deterministic timing, hardware security module (HSMv2), functional safety certification, and support for high-bandwidth automotive networks including CAN FD, FlexRay, and Ethernet AVB.

Technical Context

The SPC5746CK1MKU2 implements a crossbar switch architecture enabling concurrent access to flash, SRAM, and peripherals by multiple bus masters-including both e200z4 and e200z2 cores, eDMA, and ENET. Its System Memory Protection Unit (SMPU) provides 32 region descriptors with 16-byte granularity for memory partitioning across safety domains.

Timing integrity is enforced via three independent clock domains: FXOSC (8–40 MHz), SXOSC (32 kHz), and FIRC (16 MHz), all feeding into a frequency-modulated PLL (FMPLL) and monitored by a Clock Monitor Unit (CMU). Real-time determinism is enhanced by 64 eMIOS channels, 16 PIT timers, and two STM modules with synchronized trigger routing through the Cross Trigger Unit.

Key Specifications

Pinout & Package

SPC5746CK1MKU2 is housed in a 176-pin LQFP-EP (exposed pad) package with 0.5 mm pitch, optimized for automotive thermal and EMI performance. The exposed pad must be soldered to PCB ground for thermal dissipation and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC5748G and SPC58EC80E5, the SPC5746CK1MKU2 delivers optimal balance of FlexRay support, 8-channel CAN FD bandwidth, and ASIL-B certification in a mature, production-proven 176-LQFP package-making it the preferred choice for cost-constrained, FlexRay-reliant automotive control units where USB or Arm migration are not required.

Availability

SPC5746CK1MKU2 is available at Aetrix Electronics and suitable for powertrain control, ADAS gateways, and electric vehicle battery management systems requiring stable component supply, long-term automotive qualification, and full traceability.

Supply support for SPC5746CK1MKU2 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 functional safety and automotive-grade reliability.

The SPC5746CK1MKU2 belongs to NXP's SPC57 family of Power Architecture® microcontrollers, designed specifically for ASIL-B automotive control applications demanding high computational throughput, robust communication, and hardware-enforced safety mechanisms.

FAQ

What is the operating temperature range for the SPC5746CK1MKU2?

The SPC5746CK1MKU2 is qualified for automotive operation from –40°C to +125°C ambient temperature (Ta), with junction temperature (Tj) rated up to 150°C. This rating complies with AEC-Q100 Grade 1 requirements and supports deployment in under-hood powertrain and chassis control modules where thermal stress is significant. The 176-LQFP-EP package includes an exposed thermal pad to facilitate heat dissipation within this envelope.

Does the SPC5746CK1MKU2 support CAN FD, and how many channels are available?

Yes, the SPC5746CK1MKU2 integrates eight FlexCAN3 modules, all supporting CAN FD protocol with data rates up to 5 Mbps in the data phase. Each channel operates independently with configurable bit timing, message buffers, and error counters. This enables high-bandwidth communication for firmware updates, diagnostic logging, and real-time actuator feedback in modern ECU architectures without requiring external CAN FD transceivers.

Is the SPC5746CK1MKU2 ISO 26262 ASIL-B certified, and what safety features does it include?

Yes, the SPC5746CK1MKU2 is certified to ISO 26262 ASIL-B for specific safety mechanisms. It includes end-to-end ECC on all memory and bus transactions, a Fault Collection and Control Unit (FCCU), System Memory Protection Unit (SMPU) with 32 regions, hardware watchdog timers (SWT/STM/PIT), and lockstep-capable dual-core configuration. These features collectively support safety goals in powertrain and chassis applications, with documentation provided in NXP's Functional Safety Manual for MPC5746C.

What debug interfaces does the SPC5746CK1MKU2 support, and are they production-accessible?

The SPC5746CK1MKU2 supports IEEE 1149.1 JTAG and IEEE 1149.7 cJTAG for boundary scan and debug, plus Nexus Class 3+ trace for both e200z4 and e200z2 cores. All debug interfaces remain accessible in production devices and are compatible with standard tools including Lauterbach TRACE32 and PLS UDE. Debug authentication and access control can be configured via the Password and Device Security (PASS) module to prevent unauthorized firmware extraction.

What is the flash memory architecture of the SPC5746CK1MKU2, and does it support read-while-write (RWW)?

The SPC5746CK1MKU2 contains 3 MB of on-chip flash organized into ten 256 KB blocks, with dedicated RWW partitions in the data flash region (e.g., 0x00FC0000–0x00FFFFFF). The triple-port flash memory controller allows concurrent read, program, and erase operations-enabling background firmware updates without halting application execution. All flash accesses are protected by SECDED ECC, and the Boot Assist Flash (BAF) module supports in-system programming via SCI or CAN.