NXP Semiconductors MC56F81748MLH

Overview

MC56F81748MLH 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 with 64 KB flash and 12 KB RAM. It integrates dual 12-bit ADCs (2×8-channel), two programmable op-amps, four analog comparators with 8-bit DAC references, one 12-bit DAC, and an eFlexPWM module supporting NanoEdge 312 ps resolution - deployed in industrial motor control and solar inverter systems.

For engineers reviewing the MC56F81748MLH datasheet, MC56F81748MLH pinout, MC56F81748MLH application, or MC56F81748MLH equivalent, key selection criteria include its M-grade temperature range (–40°C to +125°C), 48-pin LQFP package, dual QSCI with LIN slave support, LPI2C with full PMBus compliance, and hardware CRC generator for functional safety-critical firmware validation.

Technical Context

The MC56F81748MLH implements the 56800EX core with modified dual-Harvard architecture: three address buses, four data buses (two 32-bit primary), single-cycle 32×32→64-bit MAC, and full shadow register stack enabling zero-overhead context switching. Its interrupt controller supports five priority levels, nested interrupts, and two programmable fast interrupts assignable to any source.

Peripherals are interconnected via an inter-module crossbar and event generator, enabling hardware-synchronized ADC-PWM triggering, comparator-DAC routing, and DMA-driven transfers across eFlexPWM, QSCI, QSPI, and LPI2C. The eFlexPWM submodule delivers 8 high-resolution outputs with NanoEdge placement, independent deadtime control per complementary pair, and FORCE_OUT simultaneous output update.

Key Specifications

Pinout & Package

MC56F81748MLH is housed in a 48-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are multiplexed via GPIOx_PER and SIM GPSx registers; all 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 MC56F81748MLH, the MC56F81768MLH offers scalable memory for advanced control algorithms without changing hardware design, while the MC56F81648VLH provides identical functionality in a lower-cost V-grade variant - making MC56F81748MLH the optimal balance of extended temperature resilience, compact 48-pin packaging, and sufficient memory for most solar, UPS, and motor control deployments.

Availability

MC56F81748MLH is available at Aetrix Electronics and suitable for industrial motor control, solar inverter systems, and uninterruptible power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC56F81748MLH 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, IoT, and mobile applications, with deep expertise in mixed-signal and real-time control silicon.

The MC56F81xxxL family was designed specifically for high-performance, safety-aware digital power conversion and motion control - combining DSP-level computational throughput with MCU-level peripheral integration and functional safety features.

FAQ

What is the maximum operating frequency of the MC56F81748MLH core?

The MC56F81748MLH core operates at up to 100 MHz in fast mode, delivering 100 MIPS performance. This frequency is achieved using the on-chip PLL with an 8–16 MHz crystal input. The core also supports 50 MHz operation in normal mode for reduced power consumption in less demanding tasks. All timing-critical peripherals - including eFlexPWM, ADC, and QSCI - are fully synchronized to this clock domain, ensuring deterministic real-time behavior in MC56F81748MLH-based control systems.

Does the MC56F81748MLH support LIN communication?

Yes, the MC56F81748MLH supports LIN slave functionality through its two queued serial communication interface (QSCI) modules. Each QSCI includes hardware LIN protocol support, including automatic header detection, checksum calculation, and response handling - all without CPU intervention. The MC56F81748MLH can operate as a LIN slave node in automotive body electronics or industrial sensor networks, with configurable baud rates and built-in 1/16-bit-time noise filtering for robust operation in electrically noisy environments.

What analog peripherals are integrated into the MC56F81748MLH?

The MC56F81748MLH integrates dual 12-bit cyclic ADCs (each with 8 external channels and x1/x2/x4 programmable gain amplifiers), two operational amplifiers (configurable as PGAs up to x16 gain), four analog comparators (each with an integrated 8-bit DAC reference), and one 12-bit DAC with auto-waveform generation (square, triangle, sawtooth). These analog resources are tightly coupled via the inter-module crossbar, enabling hardware-triggered ADC sampling from PWM events and comparator outputs routed directly to DAC references - all within the MC56F81748MLH die.

Is the MC56F81748MLH pin-compatible with other members of the MC56F81xxxL family?

The MC56F81748MLH uses a 48-pin LQFP package and shares identical pin assignments with the MC56F81648VLH and MC56F81648MLH. However, it is not pin-compatible with 64-pin variants (e.g., MC56F81768MLH) due to differing package footprints and signal allocations. Within the 48-pin group, peripherals such as QSCI, LPI2C, and eFlexPWM are mapped to the same pins - allowing direct substitution between MC56F81748MLH and MC56F81648VLH/MLH when memory and temperature grade requirements align.

What functional safety features does the MC56F81748MLH include?

The MC56F81748MLH includes multiple hardware-based functional safety mechanisms: a windowed COP watchdog with selectable clock sources (200 kHz IRC, crystal, bus clock), an external watchdog monitor (EWM) with independent safe-state output, hardware CRC generator supporting 16/32-bit polynomials and seed configuration, and brownout reset with critical low-voltage interrupt. These features collectively support compliance with IEC 61508 SIL2 and EN60730 Class B requirements - validated in MC56F81748MLH reference designs for solar inverters and industrial drives.