NXP Semiconductors MC56F81746LMLF

Overview

MC56F81746LMLF from NXP Semiconductors is a 32-bit digital signal controller (DSC) based on the 56800EX core, operating at up to 100 MHz in fast mode. It integrates 64 KB flash memory, 12 KB RAM, two 12-bit ADCs with x1/x2/x4 programmable gain amplifiers, one 12-bit DAC, and an eFlexPWM module with NanoEdge 312 ps resolution-targeting industrial motor control and solar inverter applications.

For engineers reviewing the MC56F81746LMLF datasheet, MC56F81746LMLF pinout, MC56F81746LMLF application, or MC56F81746LMLF equivalent, key selection criteria include VDD/VSSA supply separation, M-grade temperature range (-40°C to 125°C), 48-pin LQFP package, LIN-capable QSCI interfaces, and crossbar-synchronized ADC-PWM triggering for real-time closed-loop control.

Technical Context

The MC56F81746LMLF implements the 56800EX core with dual-Harvard architecture, supporting concurrent instruction fetch and dual data accesses per cycle, plus single-cycle 32×32→64-bit MAC operations. Its analog subsystem includes two independent 12-bit cyclic ADCs with 8-channel external inputs each, programmable gain amplifiers, and hardware-triggered conversion synchronized via the inter-module crossbar.

Its eFlexPWM module delivers 8 high-resolution PWM outputs with NanoEdge placement (312 ps edge resolution), independent deadtime insertion per complementary pair, and FORCE_OUT event for simultaneous output update. The device supports two LPI2C modules compliant with Full PMBus, two QSCI modules with LIN slave functionality, and a 32-bit periodic interval timer (PIT) that operates in Wait/Stop modes and wakes the CPU.

Key Specifications

Pinout & Package

MC56F81746LMLF is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Power pins include dedicated VDD/VSS (I/O), VDDA/VSSA (analog), and VCAP (core regulator bypass). Critical functional groups are segregated: ADC inputs on Port A/B, PWM outputs on Port C/D, and communication interfaces on Port E/F.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital signal controller applications.

Compared with MC56F81746LMLF, the MC56F81748LMLF offers expanded memory and I/O for complex motion control, while the TMS320F280049CPTT provides superior floating-point throughput and TI-specific analog features-but requires migration from NXP's DSC toolchain and peripheral libraries.

Availability

MC56F81746LMLF is available at Aetrix Electronics and suitable for industrial motor control, solar inverter, and uninterruptible power supply (UPS) applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC56F81746LMLF 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC56F81xxxL family targets cost-sensitive, high-reliability embedded control applications-specifically engineered for real-time digital power conversion, motor drive, and energy management systems where deterministic timing and analog integration are critical.

FAQ

What is the maximum operating frequency of the MC56F81746LMLF core?

The MC56F81746LMLF core operates at up to 100 MHz in fast mode and 50 MHz in normal mode. This frequency is achieved using the internal PLL with an 8–16 MHz crystal reference. The 100 MHz rating is validated across the full M-grade temperature range (-40°C to 125°C) and 2.7–3.6 V supply, enabling deterministic execution of 20 kHz motor control loops with margin.

Does the MC56F81746LMLF support LIN communication natively?

Yes, the MC56F81746LMLF includes two queued serial communication interface (QSCI) modules with built-in LIN slave functionality compliant with ISO 17987-4. Each QSCI supports automatic header detection, checksum validation, and sleep/wake-up frame handling without CPU intervention-enabling seamless integration into automotive body control modules and industrial sensor networks.

How many analog-to-digital converter channels does the MC56F81746LMLF have, and what is their resolution?

The MC56F81746LMLF integrates two independent 12-bit cyclic analog-to-digital converters (ADCs), each supporting up to 8 external input channels. Both ADCs feature programmable gain amplifiers (x1/x2/x4), dynamic range optimization, and hardware-triggered conversion synchronized via the inter-module crossbar-providing simultaneous sampling capability essential for three-phase current reconstruction in motor drives.

What package type and pin count does the MC56F81746LMLF use?

The MC56F81746LMLF is supplied in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. This package matches the footprint of other MC56F81xxxL variants in the same pin-count group and supports standard PCB assembly processes including reflow soldering and automated optical inspection.

Is the MC56F81746LMLF qualified for automotive applications?

The MC56F81746LMLF carries an M-grade temperature rating (-40°C to 125°C ambient), which satisfies under-hood thermal requirements for many automotive powertrain and chassis applications. While it is not AEC-Q100 qualified out-of-box, its design-including windowed COP watchdog, CRC engine, and redundant clock sources-aligns with ASIL-B functional safety concepts and is commonly deployed in non-safety-critical automotive subsystems such as HVAC actuators and auxiliary power converters.