NXP Semiconductors MC56F8257MLH

Overview

MC56F8257MLH from Freescale Semiconductor is a 60 MHz digital signal controller (DSC) based on the 56800E core, integrating DSP processing power and microcontroller functionality with dual 12-bit ADCs (2×8 channels), six-channel NanoEdge PWM (520 ps resolution), and 64 KB flash/8 KB RAM. It operates from 3.0–3.6 V across –40 °C to +105 °C and targets motor control, digital power supplies, and industrial inverters.

For engineers reviewing the MC56F8257MLH datasheet, MC56F8257MLH pinout, MC56F8257MLH application, or MC56F8257MLH equivalent, key selection criteria include its eFlexPWM fault input support (4 inputs), MSCAN 2.0A/B compliance, and crossbar-configurable peripheral interconnect for real-time control systems.

Technical Context

The MC56F8257MLH implements a dual-Harvard 56800E core delivering up to 60 MIPS, with three parallel execution units and hardware DO/REP loops enabling efficient C-compiled control code. Its architecture supports simultaneous program/data memory access and includes a 16×16-bit MAC unit with four 36-bit accumulators.

Peripherals are tightly coupled via an inter-module crossbar: ADC conversions can be triggered by eFlexPWM events, comparator outputs drive PWM fault inputs, and timer captures synchronize with PWM edges-enabling deterministic timing in servo and PMSM control loops.

Key Specifications

Pinout & Package

MC56F8257MLH is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. All I/O pins support 5 V tolerance, configurable pull-up/hysteresis, and individual push-pull/open-drain output control. Power pins include VDD/VSS pairs distributed for noise reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F8257MLH, MC56F8272VLH adds networking peripherals but requires layout changes, while dsPIC33EP512MU810 offers higher memory and sample rate but omits CAN and crossbar-making MC56F8257MLH optimal for cost-constrained, CAN-based industrial motor and power control where deterministic peripheral interconnect is critical.

Availability

MC56F8257MLH is available at Aetrix Electronics and suitable for industrial motor control, digital power supplies, solar inverters, and battery management systems requiring stable component supply and long-term lifecycle support.

Supply support for MC56F8257MLH 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, connectivity, and analog solutions for automotive, industrial, and consumer markets.

The MC56F8257MLH belongs to the 56800E-based DSC product line, designed specifically for cost-sensitive, high-performance real-time control applications requiring integrated DSP acceleration, flexible PWM, and industrial communications.

FAQ

What is the maximum operating frequency of the MC56F8257MLH core?

The MC56F8257MLH features a 56800E core rated for 60 MHz operation, delivering up to 60 million instructions per second (MIPS). This frequency is sustained across the full –40 °C to +105 °C temperature range and 3.0–3.6 V supply, with the PLL generating internal clocks for core and peripherals. The MC56F8257MLH does not support overclocking beyond 60 MHz.

Does the MC56F8257MLH support CAN communication?

Yes, the MC56F8257MLH integrates one Freescale Scalable Controller Area Network (MSCAN) 2.0A/B module compliant with ISO 11898-1, supporting both standard and extended frames at data rates up to 1 Mbps. It includes five receive buffers and three transmit buffers, and the CANRX/CANTX pins are assigned to dedicated package pins in the 64LQFP package.

How many analog-to-digital converter channels does the MC56F8257MLH have?

The MC56F8257MLH contains two independent 12-bit ADC modules (ADCA and ADCB), each supporting eight external analog inputs for a total of 16 channels. Each ADC includes a programmable gain amplifier (×1, ×2, ×4), 600 ns conversion time, and hardware synchronization triggers from eFlexPWM or timers via the crossbar.

What PWM resolution does the MC56F8257MLH provide?

The MC56F8257MLH's eFlexPWM module delivers 520 ps resolution on six NanoEdge channels via fractional delay logic, enabling sub-nanosecond edge placement accuracy. This allows precise deadtime control and phase shifting for advanced motor control topologies like space-vector modulation and soft-switching converters.

Is the MC56F8257MLH pin-compatible with other devices in the MC56F825x family?

Yes, the MC56F8257MLH shares the same 64-pin LQFP package and pinout with MC56F8255MLH and MC56F8256MLH. All three variants use identical pin assignments for power, clock, ADC, PWM, CAN, I²C, QSPI, and debug interfaces-enabling hardware reuse across flash/RAM configurations within the MC56F825x series.