NXP Semiconductors MCF51JE128CLK

Overview

MCF51JE128CLK from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller with 128 KB Flash, 32 KB RAM, and integrated USB OTG, ADC12, DAC, PDB, and MCG clock generator. It operates up to 50.33 MHz at 2.4 V, supports -40°C to 105°C industrial temperature range, and features ultra-low-power stop modes for battery-powered remote control and embedded sensor applications.

For engineers reviewing the MCF51JE128CLK datasheet, MCF51JE128CLK pinout, MCF51JE128CLK application, or MCF51JE128CLK equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options - all grounded in the official MCF51JE256/128 Rev. 4 datasheet and ordering information.

Technical Context

The MCF51JE128CLK implements the ColdFire Instruction Set Revision C (ISA_C) CPU core with 32-bit MAC support for signed/unsigned integer and fractional arithmetic. Its Multipurpose Clock Generator (MCG) integrates PLL and FLL with internal reference trimming (±0.5% to -1% deviation over voltage/temperature), enabling precise CPU frequencies up to 50 MHz.

On-chip peripherals include dual SCI interfaces with stop3 wake-up capability, two SPI modules (SPI1 with 32-bit FIFO), I²C up to 100 kbps, 12-bit SAR ADC with 12 single-ended channels operating down to 1.8 V, and a 12-bit DAC with configurable settling time - all accessible via dedicated pins including IRO for infrared carrier modulation.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm), RoHS-compliant, with exposed thermal pad per Freescale MCF51JE256 Rev. 4 datasheet Section 2.4 and Table 28.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Kinetis KL26Z128VLH4 and MCF51JM128CLK, the MCF51JE128CLK offers unique infrared carrier modulation (CMT + IRO) and tighter analog integration (DAC + PRACMP + ADC12), making it optimal for cost-sensitive, battery-powered remote control and sensor edge nodes where ARM migration isn't justified.

Availability

MCF51JE128CLK is available at Aetrix Electronics and suitable for industrial remote control transmitters, smart energy sensor nodes, portable medical diagnostics, and automotive body control subsystems requiring stable component supply and long-term lifecycle support.

Supply support for MCF51JE128CLK 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 acquired Freescale in 2015 and maintains the ColdFire portfolio for legacy industrial and automotive applications requiring deterministic real-time performance and long product lifecycles.

The MCF51JE128CLK belongs to the ColdFire V1 microcontroller family, designed specifically for cost-sensitive, ultra-low-power embedded systems requiring integrated analog peripherals, USB connectivity, and robust system-level protection - especially in remote control, sensor interface, and industrial HMI applications.

FAQ

What is the maximum operating frequency of the MCF51JE128CLK and under what voltage conditions?

The MCF51JE128CLK achieves up to 50.33 MHz at VDD ≥ 2.4 V, 40 MHz at VDD ≥ 2.1 V, and 20 MHz at VDD ≥ 1.8 V - all across the full industrial temperature range of -40°C to 105°C. These specifications are confirmed in the MCF51JE256 Rev. 4 datasheet Section 1 and Table 17 (MCG characteristics).

Does the MCF51JE128CLK support USB On-The-Go functionality, and what does that enable in practice?

Yes, the MCF51JE128CLK integrates full USB OTG dual-role capability with an on-chip transceiver and 3.3 V regulator. This allows the same MCF51JE128CLK-based device to act as a USB host (e.g., reading from a flash drive), a USB device (e.g., appearing as a virtual COM port), or an OTG controller - eliminating external PHY components and reducing BOM cost.

How many analog-to-digital converter (ADC) channels does the MCF51JE128CLK support, and what is its resolution?

The MCF51JE128CLK includes a 12-bit successive approximation (SAR) ADC with up to 12 single-ended input channels. It operates across the full supply range (3.6 V to 1.8 V) and remains functional in stop3 low-power mode - enabling continuous sensor monitoring without waking the CPU, as documented in Section 1 and Table 15 of the MCF51JE256 Rev. 4 datasheet.

What is the purpose of the IRO pin on the MCF51JE128CLK, and which peripheral drives it?

The IRO (Infrared Output) pin on the MCF51JE128CLK is a dedicated high-current-sink output driven by the Carrier Modulator Timer (CMT) peripheral. It enables direct infrared remote control signal generation without external driver circuitry - a feature explicitly listed in Table 1 and functional unit descriptions for MCF51JE256/128 in the Rev. 4 datasheet.

Is the MCF51JE128CLK pin-compatible with other members of the MCF51JE family, such as the MCF51JE256CLK?

No - the MCF51JE128CLK uses an 80-pin LQFP package, while the MCF51JE256CLK is offered in 100-pin LQFP and 104-pin MAPBGA packages. Pin assignments differ significantly; for example, FB_AD[19:0] and Mini-FlexBus signals are unavailable on the 80-pin variant. Table 1 and Figures 3 and 5 in the MCF51JE256 Rev. 4 datasheet confirm distinct pin counts and layouts.