NXP Semiconductors MC56F81766LMLF

Overview

MC56F81766LMLF 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 128 KB flash, 20 KB RAM, dual 12-bit ADCs with x4 programmable gain amplifiers, and an eFlexPWM module delivering 312 ps NanoEdge resolution. It targets industrial motor control, solar inverters, and UPS systems requiring real-time analog-digital processing and high-resolution PWM.

For engineers reviewing the MC56F81766LMLF datasheet, MC56F81766LMLF pinout, MC56F81766LMLF application, or MC56F81766LMLF equivalent, key selection criteria include its 64-pin LQFP package, -40°C to 105°C V-grade temperature range, dual QSCI with LIN slave support, 2× LPI2C with PMBus compliance, and integrated CRC generator for functional safety-critical firmware validation.

Technical Context

The MC56F81766LMLF implements the 56800EX core with dual Harvard architecture, supporting concurrent instruction fetch and dual data accesses per cycle, plus hardware DO/REP loops and bit-reverse addressing for FFT acceleration. Its unified DSP/MCU architecture enables C-efficient code for control-law execution and sensor fusion.

Peripherals are tightly coupled via the Inter-Module Crossbar and Event Generator: ADC conversions synchronize directly to eFlexPWM triggers, comparator outputs feed into DAC references, and quadrature decoder position counts route to timer inputs-enabling deterministic, low-latency closed-loop motion control without CPU intervention.

Key Specifications

Pinout & Package

MC56F81766LMLF uses a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with dedicated analog supply (VDDA/VSSA), core regulator output (VCAP), and JTAG/EOnCE test interface (TCK/TDI/TDO/TMS). Power and ground pins are distributed across multiple corners for low-impedance return paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F81746LMLF, the MC56F81766LMLF provides double flash/RAM and NanoEdge PWM for complex control algorithms and high-efficiency SiC/GaN designs; versus MC56F81668VLH, it trades M-grade temperature for LPI2C with full PMBus-making it optimal for commercial/industrial digital power systems requiring standards-compliant telemetry.

Availability

MC56F81766LMLF is available at Aetrix Electronics and suitable for industrial motor drives, solar inverters, and uninterruptible power supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MC56F81766LMLF 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal microcontrollers and digital signal processing.

The MC56F81xxxL family was designed specifically for high-performance, real-time embedded control in power electronics-integrating DSP-level math capability with MCU-level peripheral flexibility to replace discrete DSP+MCU combinations in inverters, motor drives, and digital power supplies.

FAQ

What is the maximum operating frequency of the MC56F81766LMLF core?

The MC56F81766LMLF core operates at up to 100 MHz in fast mode, delivering 100 MIPS performance. This frequency is achieved using the on-chip PLL with an 8–16 MHz crystal input, and it enables sub-microsecond execution of critical control loops such as FOC current regulation and MPPT algorithms. The MC56F81766LMLF maintains this speed across its full -40°C to +105°C operating range when supplied with 2.7–3.6 V.

Does the MC56F81766LMLF support hardware-based functional safety features?

Yes, the MC56F81766LMLF includes multiple hardware safety mechanisms: a windowed COP watchdog with selectable clock sources (including 200 kHz IRC), an External Watchdog Monitor (EWM) with independent safe-state output, CRC-16/32 hardware generator for memory and firmware validation, and brownout reset with dual LVI thresholds (2.2 V and 2.7 V). These features collectively support EN60730 Class B compliance in motor control and power conversion applications using the MC56F81766LMLF.

How many analog-to-digital converter channels does the MC56F81766LMLF have, and what is their resolution?

The MC56F81766LMLF integrates two independent 12-bit cyclic ADCs (ADCA and ADCB), each supporting up to eight external analog inputs. Both ADCs feature a built-in programmable gain amplifier with x1, x2, and x4 settings, enabling direct measurement of low-amplitude signals such as shunt resistor voltages. Each ADC achieves a minimum conversion time of 10 clock cycles at up to 12.5 MHz input clock, and conversions can be hardware-triggered by eFlexPWM or timers via the inter-module crossbar-ensuring deterministic sampling aligned to power stage switching events in the MC56F81766LMLF.

What communication interfaces are available on the MC56F81766LMLF?

The MC56F81766LMLF provides two queued SCI (QSCI) modules with LIN slave support, one queued SPI (QSPI) module supporting up to 25 Mbit/s, and two LPI2C modules compliant with PMBus v1.3. The QSCI modules include four-word FIFOs and support both full-duplex and single-wire modes, while the LPI2C modules offer master/slave operation, clock stretching, arbitration, and command/receive FIFOs-making them ideal for configuring isolated gate drivers and digital power ICs in systems built around the MC56F81766LMLF.

Is the MC56F81766LMLF pin-compatible with other members of the MC56F81xxxL family?

Yes, the MC56F81766LMLF in the 64-pin LQFP package shares identical pinout with other 64-pin variants in the MC56F81xxxL family-including MC56F81746LMLF, MC56F81668VLH, and MC56F81648VLH. Signal assignments for power, ground, JTAG, ADC inputs, PWM outputs, and communication interfaces are consistent across these parts, enabling hardware reuse and migration paths. However, peripheral enable registers must be configured per device to match enabled features (e.g., NanoEdge PWM is absent in non-766/746 variants), so firmware adaptation is required when upgrading to or from the MC56F81766LMLF.