NXP Semiconductors MC56F81668VLH

Overview

MC56F81668VLH 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 and delivering 100 MIPS. It integrates dual 12-bit ADCs with x1/x2/x4 programmable gain amplifiers, an eFlexPWM module with 312 ps NanoEdge resolution across 8 channels, and supports industrial motor control, solar inverters, and UPS systems.

For engineers reviewing the MC56F81668VLH datasheet, MC56F81668VLH pinout, MC56F81668VLH application, or MC56F81668VLH equivalent, key selection criteria include its 128 KB flash / 20 KB RAM memory map, -40°C to 105°C V-temp rating, 64-pin LQFP package, and support for PMBus-compliant LPI2C, QSCI with LIN slave, and hardware CRC generation.

Technical Context

The MC56F81668VLH 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. It supports fractional/integer arithmetic, single-cycle 32×32→64-bit MAC, and zero-overhead context switching via full register shadowing.

Its analog subsystem includes two independent 12-bit cyclic ADCs (each with 8 external channels), two operational amplifiers (gain up to ×16), four comparators with integrated 8-bit DAC references, and one 12-bit DAC with automatic waveform generation. The eFlexPWM module provides 8 high-resolution outputs with 312 ps edge placement precision and configurable deadtime per complementary pair.

Key Specifications

Pinout & Package

MC56F81668VLH is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Table 2 of the MC56F81xxx datasheet Rev. 1.1, including dedicated ADC inputs, eFlexPWM outputs, LPI2C/SPI/SCI signals, and JTAG debug interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F82748VLH and TMS320F280049CPTT, the MC56F81668VLH delivers optimal integration for cost-sensitive industrial inverters-retaining full NanoEdge PWM, dual ADC+PGA, and 12-bit DAC while avoiding over-specification in memory and automotive interfaces.

Availability

MC56F81668VLH is available at Aetrix Electronics and suitable for industrial motor control, solar inverter development, and uninterruptible power supply (UPS) designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MC56F81668VLH 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 MC56F81xxx family was designed specifically for high-performance, cost-optimized digital power conversion and motion control applications-emphasizing integrated analog peripherals, deterministic real-time response, and functional safety readiness.

FAQ

What is the maximum operating frequency and temperature rating for the MC56F81668VLH?

The MC56F81668VLH operates at up to 100 MHz in fast mode and is rated for industrial temperature range of -40°C to 105°C (V grade). Its 56800EX core delivers 100 MIPS at this frequency, and the device maintains full specification compliance-including ADC accuracy, PWM resolution, and memory access timing-across the entire temperature range without derating.

Does the MC56F81668VLH support hardware-based functional safety features?

Yes, the MC56F81668VLH includes multiple hardware safety mechanisms: windowed COP watchdog with selectable clock sources (including 200 kHz IRC), External Watchdog Monitor (EWM) with independent safe-state output, hardware CRC generator for memory and firmware validation, and brownout reset with critical low-voltage interrupt. These features align with EN60730 Class B and IEC61508 SIL-2 requirements when implemented per NXP's safety manual.

How many analog-to-digital converter channels does the MC56F81668VLH provide, and what is their resolution?

The MC56F81668VLH integrates two independent 12-bit cyclic ADCs (ADCA and ADCB), each supporting up to 8 external input channels. Both ADCs feature programmable gain amplifiers (x1/x2/x4), 12.5 MHz maximum clock rate, and simultaneous sampling capability. This configuration enables precise, synchronized acquisition of motor phase currents and DC-link voltage in single-chip inverter designs.

What PWM resolution and channel count does the MC56F81668VLH offer for high-efficiency power conversion?

The MC56F81668VLH features the eFlexPWM module with 8 high-resolution outputs enabled by NanoEdge technology, achieving 312 ps resolution for period, duty cycle, and deadtime registers. All 8 channels support independent polarity control, programmable deadtime insertion, and hardware-triggered reload-making it ideal for SiC/GaN-based power supplies and inverters requiring sub-microsecond timing precision.

Which communication interfaces are available on the MC56F81668VLH for power management and system monitoring?

The MC56F81668VLH provides two LPI2C modules compliant with PMBus v1.3, two queued SCI (QSCI) modules with LIN slave functionality, and one queued SPI (QSPI) module. These interfaces support telemetry exchange with digital power ICs (e.g., PMBus-configurable DC-DC controllers), automotive body networks (LIN), and high-speed peripheral expansion (QSPI flash or ADCs), all with hardware FIFOs and DMA support.