NXP Semiconductors MCF51MM256VLL

Overview

MCF51MM256VLL 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 and low-power sensor interface applications operating from 1.8 V to 3.6 V across –40°C to 105°C.

For engineers reviewing the MCF51MM256VLL datasheet, MCF51MM256VLL pinout, MCF51MM256VLL application, or MCF51MM256VLL equivalent, key selection criteria include its dual-role USB OTG support, ultra-low-power stop3 mode with 6 µs wake-up, ColdFire ISA_C instruction set, on-chip 104-pin MAPBGA package, and integrated analog front-end for precision current/voltage sensing in battery-powered instrumentation.

Technical Context

The MCF51MM256VLL implements a ColdFire V1 CPU core with MAC unit supporting signed/unsigned integer and fractional arithmetic, and operates at up to 50.33 MHz above 2.4 V. Its Multipurpose Clock Generator (MCG) integrates PLL and FLL with internal reference trimming enabling ±0.5% to –1% deviation over voltage and temperature.

It features two independent 128 KB Flash arrays permitting concurrent execution and programming, hardware CRC acceleration, and a robust debug interface compliant with ColdFire DEBUG_Rev_B+ using single-wire BDM. The Mini-FlexBus supports external memory expansion with user-programmable chip selects and address/data multiplexing capability.

Key Specifications

Pinout & Package

Package: 104-pin MAPBGA (10 mm × 10 mm, 0.8 mm pitch). Pinout validated per Freescale Document MCF51MM256 Rev. 5, Section 2.1 and Table 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with K22F51212 and MCF52259, the MCF51MM256VLL delivers unique value in ultra-low-power, analog-intensive metering by integrating TRIAMPs, PDB-coordinated ADC/DAC, and CMT - reducing BOM count and PCB area where precision current measurement and IR remote control are required.

Availability

MCF51MM256VLL is available at Aetrix Electronics and suitable for handheld energy meters, portable gas detectors, smart water flow meters, industrial panel meters, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MCF51MM256VLL 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 MCF51MM256VLL belongs to the ColdFire V1 microcontroller family, engineered specifically for low-cost, low-power, high-precision metering and sensor interface applications in handheld and portable instrumentation.

FAQ

What is the maximum operating frequency of the MCF51MM256VLL and under what voltage conditions?

The MCF51MM256VLL achieves up to 50.33 MHz when supplied at ≥2.4 V, 40 MHz at ≥2.1 V, and 20 MHz at ≥1.8 V - all across the full industrial temperature range of –40°C to +105°C. This voltage-frequency scaling allows dynamic power optimization in battery-powered MCF51MM256VLL designs without sacrificing real-time responsiveness.

Does the MCF51MM256VLL support USB On-The-Go functionality, and what hardware resources does it integrate for this purpose?

Yes, the MCF51MM256VLL supports full USB On-The-Go (OTG) in device, host, and OTG configurations. It integrates an on-chip transceiver, 3.3 V USB regulator, VBUS sensing, ID pin detection, and USB_PULLUP control - eliminating external PHY, LDO, or discrete pull-up resistors in MCF51MM256VLL-based designs.

How many analog-to-digital converter (ADC) channels does the MCF51MM256VLL provide, and what is their resolution and configuration flexibility?

The MCF51MM256VLL includes a 16-bit successive approximation ADC with up to four dedicated differential input pairs and eight single-ended channels. It supports hardware-triggered conversions via the Programmable Delay Block (PDB), range-compare functions, and operation down to 1.8 V - enabling synchronized, high-accuracy measurements in MCF51MM256VLL metering systems.

What low-power features does the MCF51MM256VLL offer for battery-operated applications?

The MCF51MM256VLL offers two ultra-low-power stop modes, including stop3 with 6 µs wake-up time and Time-of-Day (TOD) counter running independently. Its ultra-low-power external oscillator sustains TOD accuracy during deep sleep, and peripherals like PRACMP and ADC remain functional in stop3 - extending battery life in MCF51MM256VLL-based portable instruments.

Is the MCF51MM256VLL pin-compatible with other members of the MCF51MM family, such as the MCF51MM128VLL?

No, the MCF51MM256VLL is not pin-compatible with the MCF51MM128VLL. While both share the same 104-pin MAPBGA package footprint, the MCF51MM128VLL is only offered in 80-pin LQFP and 81-pin MAPBGA variants per Freescale's ordering information - meaning MCF51MM256VLL's 104-pin MAPBGA layout has no direct pin-for-pin alternative in the same family.