NXP Semiconductors MC56F81668LVLH

Overview

MC56F81668LVLH 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 with 312 ps NanoEdge resolution. Designed for industrial motor control and solar inverters, it supports real-time closed-loop control with deterministic interrupt latency.

For engineers reviewing the MC56F81668LVLH datasheet, MC56F81668LVLH pinout, MC56F81668LVLH application, or MC56F81668LVLH equivalent, key selection criteria include VDD/VSSA supply separation, 64-pin LQFP package compatibility, -40°C to 105°C V-grade temperature range, and support for PMBus via dual LPI2C interfaces.

Technical Context

The MC56F81668LVLH implements the 56800EX core with dual-Harvard architecture, supporting concurrent instruction fetch and dual data accesses per cycle. Its unified DSP/MCU architecture delivers 100 MIPS while enabling efficient C compilation and zero-overhead context switching via shadow register stack.

Peripheral integration centers on deterministic real-time control: the eFlexPWM submodule provides 8 NanoEdge PWM outputs with 312 ps edge placement resolution, synchronized to ADC conversions via the inter-module crossbar; dual 12-bit ADCs operate at up to 12.5 MHz with parallel scan mode and hardware-triggered sequencing.

Key Specifications

Pinout & Package

MC56F81668LVLH is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are multiplexed via GPIOx_PER and SIM GPSx registers; all I/O pins default to GPIO input after reset except JTAG and RESET_B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F81768LVLH, the MC56F81668LVLH omits QSPI but retains identical ADC, PWM, and memory specs-making it optimal for fixed-peripheral industrial drives. Versus STM32F334R8T6, the MC56F81668LVLH delivers deterministic 100 MHz DSC performance and hardware-accelerated motor control instructions not available in general-purpose Cortex-M devices.

Availability

MC56F81668LVLH is available at Aetrix Electronics and suitable for industrial motor control, solar inverter, and uninterruptible power supply applications requiring stable component supply across extended product lifecycles.

Supply support for MC56F81668LVLH 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 was designed specifically for high-performance, real-time digital power and motor control applications-emphasizing deterministic PWM timing, analog integration, and functional safety compliance.

FAQ

What is the maximum operating frequency of the MC56F81668LVLH core?

The MC56F81668LVLH core operates at up to 100 MHz in fast mode, delivering 100 MIPS performance. This frequency is achieved using the internal PLL with an 8–16 MHz crystal oscillator input. The device also supports 50 MHz operation in normal mode for lower-power applications. All timing specifications in the datasheet-including ADC conversion rates and PWM resolution-are validated at the 100 MHz maximum frequency.

Does the MC56F81668LVLH support PMBus communication?

Yes, the MC56F81668LVLH supports Full PMBus via its two LPI2C modules. Each LPI2C interface complies with Standard, Fast, Fast+, and Ultra Fast I²C modes and includes dedicated command/receive FIFOs, clock stretching, and arbitration logic required for PMBus slave/master operation. This enables direct digital communication with PMBus-compliant DC-DC controllers and power monitors without external protocol translation.

What analog peripherals are integrated into the MC56F81668LVLH?

The MC56F81668LVLH integrates dual 12-bit cyclic ADCs with x1/x2/x4 programmable gain amplifiers, two operational amplifiers configurable as PGAs or filters, four analog comparators each with an integrated 8-bit DAC reference, and one 12-bit DAC with automatic waveform generation. These peripherals are interconnected via the inter-module crossbar, allowing hardware-synchronized ADC sampling triggered by PWM events or timer outputs.

What is the temperature grade and supply voltage range for the MC56F81668LVLH?

The MC56F81668LVLH is specified as a V-grade device with an operating ambient temperature range of -40°C to +105°C. It operates from a single 2.7 V to 3.6 V supply, with separate VDDA and VSSA pins for analog circuitry to maintain ADC/DAC accuracy. The device includes brown-out reset (2.0 V), low-voltage interrupt (2.2 V and 2.7 V thresholds), and power-on reset circuitry fully integrated.

How many PWM outputs does the MC56F81668LVLH support, and what is their resolution?

The MC56F81668LVLH supports up to 12 PWM outputs via its eFlexPWM module, with 8 channels featuring NanoEdge high-resolution capability. When enabled, NanoEdge provides 312 ps resolution for PWM period, duty cycle, and deadtime-enabling precise gate drive timing for wide-bandgap power devices. All PWM outputs are software-controllable, support complementary pair configuration, and can be forced simultaneously via hardware events.