NXP Semiconductors MC56F81746MLF

Overview

MC56F81746MLF 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 motion control and industrial inverters.

For engineers reviewing the MC56F81746MLF datasheet, MC56F81746MLF pinout, MC56F81746MLF application, or MC56F81746MLF equivalent, key selection criteria include its 48-pin LQFP package, M-grade temperature range (–40°C to +125°C), dual LPI2C interfaces supporting Full PMBus, and hardware CRC generator for functional safety compliance.

Technical Context

The MC56F81746MLF implements the 56800EX core with dual-Harvard architecture, enabling 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 pre-amplifier gain, and hardware-triggered conversion synchronization via crossbar.

Its eFlexPWM module delivers 8 high-resolution PWM outputs with NanoEdge placement (312 ps edge resolution), independent deadtime insertion per complementary pair, and fault management via up to eight assignable fault inputs. System-level timing is managed by two 32-bit Periodic Interval Timers (PITs), one quadrature decoder, and a windowed COP watchdog with selectable clock sources including 200 kHz IRC and crystal oscillator.

Key Specifications

Pinout & Package

MC56F81746MLF is housed in a 48-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are multiplexed via GPIO and SIM registers; primary reset state assigns pins to core peripherals including ADC, PWM, and communication modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F81746MLF, the MC56F81748MLF offers double flash/RAM capacity in identical M-grade 48-pin packaging-ideal for feature-rich firmware-while the MC56F81646VLF trades extended temperature for higher pin count and lower qualification cost, making it viable for commercial-grade motion control boards.

Availability

MC56F81746MLF is available at Aetrix Electronics and suitable for industrial motor control, solar inverter development, and medical device production requiring stable component supply across long product lifecycles.

Supply support for MC56F81746MLF 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.

The MC56F81xxxL family was designed specifically for real-time embedded control in power electronics, combining DSP performance with MCU flexibility and integrated analog/motor control peripherals.

FAQ

What is the maximum operating frequency of the MC56F81746MLF core?

The MC56F81746MLF core operates at up to 100 MHz in fast mode, delivering 100 MIPS performance. This frequency is achieved using the internal PLL locked to an external 4–16 MHz crystal oscillator or the on-chip 8 MHz IRC. The 56800EX architecture sustains this throughput with single-cycle MAC operations and concurrent instruction/data access-critical for real-time motor control loops in the MC56F81746MLF.

Does the MC56F81746MLF support hardware-based functional safety features?

Yes, the MC56F81746MLF includes multiple hardware safety mechanisms: a windowed COP watchdog with selectable clock sources (200 kHz IRC, crystal, bus clock), an External Watchdog Monitor (EWM) with independent safe-mode output, and a hardware CRC generator supporting 16/32-bit polynomials. These features enable compliance with EN60730 Class B and IEC 61508 SIL-2 requirements when implemented per NXP's safety manual for the MC56F81746MLF.

How many analog input channels does the MC56F81746MLF support, and what is their resolution?

The MC56F81746MLF integrates two independent 12-bit cyclic ADCs, each supporting up to 8 external analog input channels (ADCA0–ADCA7 and ADCB0–ADCB7). Each ADC includes a programmable gain amplifier (x1/x2/x4), supports single-ended and differential conversions, and achieves 10-cycle conversion time at up to 12.5 MHz clock rate-enabling synchronized current/voltage sampling critical in the MC56F81746MLF's motor control applications.

What PWM resolution does the MC56F81746MLF provide, and how is it achieved?

The MC56F81746MLF's eFlexPWM module provides 312 ps edge placement resolution via NanoEdge technology-a fractional delay capability that enhances base 16-bit PWM timing. This resolution is achieved through dedicated hardware interpolation logic within each PWM submodule, allowing sub-nanosecond deadtime tuning without CPU overhead. It directly benefits high-frequency SiC/GaN inverter designs implemented with the MC56F81746MLF.

Is the MC56F81746MLF pin-compatible with other devices in the MC56F81xxxL family?

Yes, the MC56F81746MLF in 48-pin LQFP is pin-compatible with the MC56F81748MLF (128 KB flash) and MC56F81646VLF (64-pin LQFP, V-grade) within the same package variant. Signal multiplexing and pin assignments match per NXP's MC56F81XXXL datasheet Table 2, enabling hardware reuse across firmware variants. However, the MC56F81746MLF is not pin-compatible with 64-pin or 32-pin variants due to differing pin counts and I/O allocations.