NXP Semiconductors MC56F81748VLH

Overview

MC56F81748VLH from NXP Semiconductors is a 32-bit digital signal controller (DSC) based on the 56800EX core, delivering up to 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 312 ps NanoEdge resolution, and supports industrial motor control, solar inverters, and UPS systems.

For engineers reviewing the MC56F81748VLH datasheet, MC56F81748VLH pinout, MC56F81748VLH application, or MC56F81748VLH equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative parts for motion control, power conversion, and embedded safety-critical designs.

Technical Context

The MC56F81748VLH implements the 56800EX core with modified dual Harvard architecture, supporting concurrent instruction fetches and dual data accesses per cycle. It features four 36-bit accumulators, hardware DO/REP loops, bit-reverse addressing for FFT, and full register shadowing for zero-overhead context switching.

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 delivers 8 high-resolution outputs with 312 ps edge placement precision via NanoEdge technology.

Key Specifications

Pinout & Package

MC56F81748VLH is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Table 2 of the MC56F81xxx datasheet Rev. 1.1, with primary reset states and multiplexed peripheral assignments confirmed for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F82748VLH, the MC56F81748VLH omits USB and crypto engines to reduce cost and power, making it optimal for standalone motor drives. Against dsPIC33CK256MP508-I/M8, it delivers higher analog integration and finer PWM resolution-critical for solar microinverters and medical power supplies demanding <1% THD.

Availability

MC56F81748VLH is available at Aetrix Electronics and suitable for industrial motor control, solar inverter design, and uninterruptible power supply development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MC56F81748VLH 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 control architectures.

The MC56F81748VLH belongs to NXP's 56800EX-based DSC family, engineered specifically for high-precision real-time control in power electronics-emphasizing deterministic timing, analog integration, and functional safety compliance.

FAQ

What is the maximum ADC sampling rate supported by the MC56F81748VLH?

The MC56F81748VLH supports a maximum ADC clock frequency of 12.5 MHz, enabling a minimum conversion period of 80 ns. With 10-cycle single conversion time and 8-cycle additional time, it achieves sustained sampling rates up to 10 MSps per ADC channel when operating in parallel scan mode-sufficient for high-bandwidth current loop control in 20 kHz switching inverters.

Does the MC56F81748VLH support hardware-based deadtime insertion for complementary PWM outputs?

Yes, the MC56F81748VLH's eFlexPWM module provides independent top and bottom deadtime insertion for each complementary PWM pair. Deadtime values can be programmed with 312 ps resolution when NanoEdge is enabled, and registers are double-buffered to prevent glitches during runtime updates-essential for preventing shoot-through in three-phase bridge drivers.

Can the MC56F81748VLH operate in stop mode while maintaining ADC or PWM functionality?

No-the MC56F81748VLH disables ADC and eFlexPWM modules in stop mode. However, Periodic Interrupt Timers (PIT0/PIT1) and the Windowed COP watchdog remain active and can wake the CPU from stop mode. For low-power sensing, use wait mode instead, where ADC and PWM retain full functionality while CPU clocks are gated.

What clock sources are available for the MC56F81748VLH's PLL and how do they impact system reliability?

The MC56F81748VLH PLL accepts 4–16 MHz crystal/resonator inputs or internal 8 MHz IRC. Loss-of-reference detection triggers a 128-cycle reset, and selectable clock sources (crystal, IRC, bus) for COP/EWM ensure continued watchdog operation even if main oscillator fails-meeting EN60730 Class B requirements for industrial safety-critical systems.

How does the inter-module crossbar in the MC56F81748VLH simplify system-level timing coordination?

The inter-module crossbar in the MC56F81748VLH provides hardware routing between peripherals-e.g., ADC end-of-conversion can directly trigger PWM reload, comparator output can force DAC update, and timer overflow can initiate DMA transfers-without CPU intervention. This eliminates software latency and jitter, enabling deterministic sub-microsecond timing alignment across analog, PWM, and communication subsystems.