NXP Semiconductors MC56F81748LMLH

Overview

MC56F81748LMLH 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 312 ps NanoEdge resolution, and 128 KB flash/20 KB RAM - all in a 48-pin LQFP package rated for -40°C to 125°C operation. It targets high-precision motor control and industrial power conversion.

For engineers reviewing the MC56F81748LMLH datasheet, MC56F81748LMLH pinout, MC56F81748LMLH application, or MC56F81748LMLH equivalent, key selection criteria include its M-grade temperature rating, 8-channel NanoEdge PWM capability, dual high-speed ADC support with hardware-triggered synchronization to PWM, and integrated LPI2C modules compliant with full PMBus.

Technical Context

The MC56F81748LMLH implements the 56800EX core with modified dual-Harvard architecture, supporting concurrent instruction fetch and dual data accesses per cycle, plus single-cycle 32×32→64-bit MAC operations. Its unified DSP/MCU architecture enables efficient C compilation and zero-overhead context switching via full register stack shadowing.

Peripheral integration centers on deterministic real-time control: the eFlexPWM submodule supports 8 independent NanoEdge PWM outputs with 312 ps edge placement resolution and configurable deadtime per complementary pair; two 12-bit cyclic ADCs operate up to 12.5 MHz with parallel scan mode and crossbar-synchronized triggering from PWM or timers.

Key Specifications

Pinout & Package

MC56F81748LMLH is housed in a 48-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined by GPIO peripheral enable and SIM GPS registers; primary reset state assigns each pin to its default signal role.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F81748LMLH, the MC56F81768LMLH offers expanded serial connectivity at identical thermal and package compatibility, while the MC56F81648VLH reduces memory and temperature capability for price-sensitive volume production - neither is pin-compatible without firmware adaptation due to differing peripheral enable register mappings.

Availability

MC56F81748LMLH is available at Aetrix Electronics and suitable for industrial motor control, solar microinverter, and uninterruptible power supply (UPS) applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MC56F81748LMLH 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, with over 40 years of embedded processing expertise.

The MC56F81xxxL family delivers integrated digital signal control for real-time power electronics, combining DSP performance with MCU flexibility to replace discrete controller + signal processor combinations in motion and energy conversion systems.

FAQ

What is the maximum operating frequency and temperature grade of the MC56F81748LMLH?

The MC56F81748LMLH operates at up to 100 MHz core frequency in fast mode and is rated for -40°C to +125°C ambient temperature (M-grade). This makes it suitable for under-hood automotive inverters and industrial motor drives where thermal robustness is critical. The device maintains full specification compliance across this range without derating. MC56F81748LMLH uses internal PLL multiplication from 4–16 MHz crystal inputs to achieve the 100 MHz core clock.

Does the MC56F81748LMLH support hardware-synchronized ADC sampling with PWM events?

Yes, the MC56F81748LMLH supports direct hardware-triggered ADC conversions using eFlexPWM reload and compare events via the inter-module crossbar. This enables deterministic sampling aligned to switching cycles - essential for current-loop control in motor drives. Each of the two 12-bit ADCs can be independently triggered, and both support parallel scan mode for simultaneous multi-channel acquisition. MC56F81748LMLH's ADCs achieve 10-cycle conversion time at up to 12.5 MHz clock rate.

What PWM resolution does the MC56F81748LMLH provide, and how is it achieved?

The MC56F81748LMLH delivers 312 ps PWM edge placement resolution using its NanoEdge feature within the eFlexPWM module. This is achieved through fractional delay logic that interpolates between base clock edges, enabling sub-nanosecond timing control without increasing system clock frequency. All 8 NanoEdge-capable PWM channels support independent deadtime insertion and FORCE_OUT synchronized updates. MC56F81748LMLH uses this resolution for precise SiC/MOSFET gate timing in high-efficiency resonant converters.

Which communication interfaces with PMBus support does the MC56F81748LMLH include?

The MC56F81748LMLH integrates two LPI2C modules fully compliant with PMBus v1.3, supporting commands such as READ_VIN, READ_IOUT, STORE_DEFAULT_ALL, and OPERATION. These interfaces operate in Fast+, Ultra Fast, and High-Speed modes and include hardware FIFOs, clock stretching, and arbitration logic. MC56F81748LMLH uses them for direct telemetry exchange with digital power controllers in UPS and server PSU applications without external protocol translators.

Is the MC56F81748LMLH pin-compatible with other members of the MC56F81xxxL family?

No, the MC56F81748LMLH is not universally pin-compatible across the MC56F81xxxL family. While it shares the 48-pin LQFP package with MC56F81648VLH and MC56F81768LMLH, pin assignments differ for certain peripherals (e.g., QSCI vs. LPI2C signal mapping, ADC input channel allocation). Board-level compatibility requires verification against the specific signal multiplexing table in the MC56F81XXXL datasheet Rev. 3. MC56F81748LMLH pinout is fixed per Table 2 and cannot be assumed interchangeable without layout review.