NXP Semiconductors MCF51AC128AVFUE

Overview

MCF51AC128AVFUE from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller with CAN interface, 128 KB flash, 32 KB SRAM, and 64-pin QFP package operating up to 50.33 MHz at 2.7–5.5 V. It integrates dual analog comparators, 24-channel 12-bit ADC, two FTM modules, SCI/SCI2, SPI1/SPI2, IIC, CRC, and MCG for industrial motor control and automotive body electronics.

For engineers reviewing the MCF51AC128AVFUE datasheet, MCF51AC128AVFUE pinout, MCF51AC128AVFUE application, or MCF51AC128AVFUE equivalent, key selection criteria include CAN 2.0A/B compliance, 64-pin QFP thermal performance (–40°C to 105°C), 12-bit ADC timing in low-power modes, FTM deadtime insertion capability, and background debug module (BDM) single-wire trace support.

Technical Context

The MCF51AC128AVFUE implements the ColdFire V1 core with ISA_C instruction set, delivering 0.76 DMIPS/MHz when executing from flash and supporting background debug via single-wire BDM with 6 hardware breakpoints. Its MCG includes FLL/PLL clock synthesis with trimmable internal reference (0.2% resolution), enabling precise frequency generation from crystal (1–16 MHz) or LPO sources.

System-level integration includes CF1_INTC handling 40 peripheral interrupts with fixed vector mapping, dual FTM modules supporting center-aligned PWM with synchronized register loads and fault input protection, and MSCAN with five receive buffers, three prioritized transmit buffers, and programmable wakeup filtering - all operating within the same 64-pin QFP footprint as the MCF51AC256AVFUE but with reduced flash capacity.

Key Specifications

Pinout & Package

64-pin QFP package (14 mm × 14 mm), RoHS-compliant, with exposed pad for thermal dissipation. Pin functions validated per Figure 3 (MCF51AC256 Series 64-Pin QFP/LQFP) and Table 4 of Rev.7 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCF51AC128AVFUE, the MCF51AC256AVFUE offers double flash capacity without altering pinout or thermal design, while the S9KEAZ128AMLH provides ARM toolchain alignment at the cost of deterministic FTM timing and rapid GPIO performance critical for motor control.

Availability

MCF51AC128AVFUE is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and medical infusion pump designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCF51AC128AVFUE 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, formed from the spin-off of Freescale Semiconductor in 2015.

The MCF51AC128AVFUE belongs to NXP's ColdFire microcontroller product line, designed specifically for cost-sensitive, real-time embedded systems requiring CAN connectivity, analog integration, and robust debug capabilities in harsh environments.

FAQ

What is the maximum operating frequency and voltage range for the MCF51AC128AVFUE?

The MCF51AC128AVFUE operates at up to 50.33 MHz across a supply voltage range of 2.7 V to 5.5 V. This wide voltage range supports direct connection to both 3.3 V and 5 V systems without level-shifting, and the specified frequency is guaranteed over the full industrial temperature range (–40°C to 105°C) per Rev.7 datasheet Section 2.11.

Does the MCF51AC128AVFUE support CAN FD or only classical CAN 2.0?

The MCF51AC128AVFUE implements only classical CAN 2.0A/B protocol (ISO 11898-1:2003), supporting standard and extended identifiers, up to 8-byte payloads, and bit rates up to 1 Mbps. It does not support CAN FD features such as flexible data-rate or extended payload length, as confirmed by the MSCAN functional description in Section 1.3.1 of the datasheet.

How many analog comparator channels does the MCF51AC128AVFUE include, and what are their key capabilities?

The MCF51AC128AVFUE includes two analog comparators (ACMP1 and ACMP2). Each supports rail-to-rail input operation, selectable interrupt on rising/falling/both edges, comparison against internal bandgap reference, and output visibility on dedicated pins (ACMP1O, ACMP2O), as documented in Table 2 and Section 1.3.1 of the Rev.7 datasheet.

What debug interfaces are supported by the MCF51AC128AVFUE, and is JTAG available?

The MCF51AC128AVFUE supports only the single-wire Background Debug Mode (BDM) interface via the BKGD/MS pin - it does not include JTAG. The BDM implementation provides full debugging capability including 6 hardware breakpoints, real-time trace via VBUS, and on-chip trace buffer, as detailed in Section 1.3.1 and Figure 1 of the datasheet.

Is the MCF51AC128AVFUE pin-compatible with the MCF51AC256AVFUE, and can they share the same PCB layout?

Yes, the MCF51AC128AVFUE and MCF51AC256AVFUE are fully pin-compatible in the 64-pin QFP package (VFUE suffix), sharing identical pin assignments, electrical characteristics, and thermal profiles. This allows direct substitution on the same PCB without layout changes, as verified in Figure 3 and Table 4 of the Rev.7 datasheet.