NXP Semiconductors MCF51MM256VLK

Overview

MCF51MM256VLK from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller with 256 KB flash, 32 KB RAM, and integrated measurement engine including 16-bit ADC, 12-bit DAC, dual op-amps, dual trans-impedance amplifiers, and programmable delay block - designed for handheld metering applications operating across –40°C to 105°C at supply voltages from 1.8 V to 3.6 V.

For engineers reviewing the MCF51MM256VLK datasheet, MCF51MM256VLK pinout, MCF51MM256VLK application, or MCF51MM256VLK equivalent, key selection considerations include its dual-role USB OTG interface, ultra-low-power stop3 mode with 6 µs wake-up, ColdFire ISA_C instruction set, on-chip CRC, and Mini-FlexBus expansion capability for external memory/peripherals.

Technical Context

The MCF51MM256VLK implements the ColdFire V1 CPU core with MAC unit supporting signed/unsigned integer and fractional arithmetic. Its Multipurpose Clock Generator (MCG) integrates PLL and FLL with internal reference trimming enabling ±0.5% to –1% deviation over voltage and temperature, delivering CPU frequencies from 4 kHz to 50.33 MHz depending on supply voltage and ambient conditions.

It features two independent 128 KB flash arrays supporting concurrent read/program/erase and interrupt handling during programming, plus security circuitry preventing unauthorized access to flash and RAM. The measurement engine includes PDB-triggered ADC/DAC synchronization, 4 differential + 8 single-ended ADC channels, and dedicated infrared output (IRO) with high-current sink for remote control.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm), thermally enhanced with exposed pad, compliant with JEDEC MS-026.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with K22F51212VLH12 and MCF52259CAG80, the MCF51MM256VLK offers unique on-die analog signal chain integration - particularly its dual TRIAMPs, CMT, and PDB-synchronized ADC/DAC - making it optimal for cost-sensitive, battery-operated metering where analog front-end consolidation reduces component count and power consumption.

Availability

MCF51MM256VLK is available at Aetrix Electronics and suitable for handheld energy meters, portable gas detectors, industrial remote controllers, and smart water flow meters requiring stable component supply and long-term industrial lifecycle support.

Supply support for MCF51MM256VLK 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.

The MCF51MM256VLK belongs to NXP's ColdFire V1 microcontroller family, engineered specifically for ultra-low-power, high-precision analog-intensive applications such as utility metering and portable instrumentation.

FAQ

What is the maximum CPU frequency supported by the MCF51MM256VLK under 3.3 V operation?

The MCF51MM256VLK supports up to 50.33 MHz CPU frequency when operating above 2.4 V and within the –40°C to 105°C temperature range. At 3.3 V, full 50.33 MHz operation is guaranteed per the datasheet's electrical characteristics table, provided the MCG is configured with appropriate PLL settings and stable clock sources.

Does the MCF51MM256VLK support USB device mode without external components?

Yes, the MCF51MM256VLK supports full-speed USB 2.0 device mode with an integrated transceiver and on-chip 3.3 V regulator (VUSB33). No external PHY or LDO is required - only standard USB termination resistors and ESD protection diodes are recommended for robustness in end equipment.

How many analog input channels does the 16-bit ADC in the MCF51MM256VLK support?

The MCF51MM256VLK's ADC16 module supports up to four dedicated differential input channels (each requiring two pins) and eight single-ended input channels, for a total of 16 analog input points. All channels operate across the full 1.8 V to 3.6 V supply range and remain functional in stop3 mode.

Can the MCF51MM256VLK generate infrared carrier signals directly?

Yes, the MCF51MM256VLK includes a Carrier Modulator Timer (CMT) with dedicated IRO output pin capable of generating modulated infrared carrier signals (e.g., 38 kHz) with programmable duty cycle and depth. The CMT operates independently in stop3 mode, enabling ultra-low-power remote control functionality.

What debug interface does the MCF51MM256VLK use, and is it compatible with standard tools?

The MCF51MM256VLK uses the ColdFire DEBUG_Rev_B+ interface with single-wire BDM (Background Debug Mode) over the BKGD pin. It is fully compatible with standard P&E Micro and Segger J-Link debug probes supporting ColdFire V1, and integrates seamlessly with CodeWarrior Development Studio and modern Eclipse-based IDEs via OpenOCD support.