NXP Semiconductors MC56F81746VLF

Overview

MC56F81746VLF from NXP Semiconductors is a 32-bit digital signal controller (DSC) based on the 56800EX core, delivering 100 MIPS at 100 MHz in fast mode. It integrates dual 12-bit ADCs with x1/x2/x4 programmable gain amplifiers, an eFlexPWM module with 8 NanoEdge PWM outputs (312 ps resolution), and 64 KB flash / 12 KB RAM. Designed for motion control and industrial inverters, it operates from 2.7 V to 3.6 V across –40°C to 105°C.

For engineers reviewing the MC56F81746VLF datasheet, MC56F81746VLF pinout, MC56F81746VLF application, or MC56F81746VLF equivalent, key selection criteria include its 64-pin LQFP package, V-temperature grade (–40°C to 105°C), dual QSCI with LIN slave support, LPI2C with full PMBus compliance, and hardware CRC generator for functional safety-critical firmware integrity.

Technical Context

The MC56F81746VLF implements the 56800EX core with modified dual Harvard architecture-three address buses and four data buses enabling concurrent instruction fetch and dual data access per cycle. Its unified DSP/MCU architecture supports fractional/integer arithmetic, single-cycle 32×32→64-bit MAC, and zero-overhead context switching via full register stack shadowing.

Peripheral integration centers on deterministic real-time control: the eFlexPWM submodule enables 312 ps edge placement with independent deadtime control per complementary pair; dual 12-bit ADCs synchronize conversions via crossbar-triggering from PWM or timers; and the inter-module crossbar routes signals between ADCs, comparators, DAC, eFlexPWM, QDC, and GPIO without CPU intervention.

Key Specifications

Pinout & Package

MC56F81746VLF uses a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Power pins include VDD (pins 29, 44, 60), VSS (pins 30, 43, 61), VDDA (pin 22), VSSA (pin 23), and VCAP (pin 26). JTAG debug interface occupies TDI (pin 64), TDO (pin 62), TCK (pin 1), and TMS (pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F81746VLF, MC56F82746VLF offers headroom for future firmware expansion without changing PCB layout, while TMS320F280049CPT provides superior computational throughput for advanced observer-based control-but requires revalidation of PWM timing and analog calibration routines.

Availability

MC56F81746VLF is available at Aetrix Electronics and suitable for industrial motor drives, solar inverters, uninterruptible power supplies (UPS), and smart appliance control systems requiring stable component supply across extended product lifecycles.

Supply support for MC56F81746VLF 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 real-time control and functional safety.

The MC56F81xxx family was designed specifically for cost-sensitive, high-reliability industrial power conversion and motion control-emphasizing deterministic PWM timing, analog integration, and embedded safety features without external co-processors.

FAQ

What is the maximum operating frequency and temperature range for the MC56F81746VLF?

The MC56F81746VLF operates at up to 100 MHz in fast mode and is rated for –40°C to 105°C ambient temperature (V-grade). This specification is validated across the full 2.7 V to 3.6 V supply range and applies to all on-chip peripherals including eFlexPWM, ADCs, and communication modules. The device maintains timing closure and ADC accuracy within these limits per NXP's MC56F81XXX Rev. 1.1 datasheet Section 1.3.

Does the MC56F81746VLF support LIN communication, and how is it implemented?

Yes, the MC56F81746VLF supports LIN slave functionality through its two queued serial communication interface (QSCI) modules. Each QSCI includes hardware LIN protocol support-including sync field detection, identifier filtering, checksum calculation, and automatic response handling-without CPU intervention. This capability is confirmed in Section 1.5.10 of the MC56F81XXX datasheet and enables direct integration into automotive body control modules or industrial sensor networks using single-wire LIN physical layer.

How many PWM outputs does the MC56F81746VLF provide, and what is the resolution of NanoEdge PWM?

The MC56F81746VLF provides eight NanoEdge PWM outputs with 312 ps resolution for period, duty cycle, and deadtime registers when enabled. These outputs are part of the eFlexPWM module and support independent edge placement, complementary pair configuration, and hardware synchronization to ADC triggers. This specification is documented in Section 1.5.1 and Table 1 of the MC56F81XXX datasheet, confirming sub-nanosecond timing precision for SiC/GaN gate driver control.

What analog peripherals are integrated into the MC56F81746VLF, and how are they configured?

The MC56F81746VLF integrates two 12-bit cyclic ADCs (each with 8 external channels and x1/x2/x4 programmable gain amplifiers), four analog comparators with integrated 8-bit DAC references, two operational amplifiers (gain up to x16), and one 12-bit DAC. All analog blocks share dedicated VDDA/VSSA rails and are routed via the inter-module crossbar for trigger synchronization. Configuration is performed through dedicated peripheral registers-not GPIO MUX-as specified in Sections 1.5.2 through 1.5.5 of the MC56F81XXX datasheet.

Is the MC56F81746VLF pin-compatible with other members of the MC56F81xxx family?

Yes, the MC56F81746VLF in 64-pin LQFP is pin-compatible with MC56F81768VLF, MC56F81748VLF, and MC56F81766VLF-sharing identical pin assignments for power, ground, JTAG, ADC inputs, PWM outputs, and communication interfaces. Differences are limited to internal memory size and peripheral enablement (e.g., op-amp count), which are software-configurable. This compatibility is explicitly stated in Table 2 and Section 4.1 of the MC56F81XXX datasheet.