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NXP Semiconductors MCF51AC256BCLKE
- Part No.:
- MCF51AC256BCLKE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
MCF51AC256BCLKE.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
MCF51AC256BCLKE from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller without CAN interface, housed in an 80-pin LQFP package (14 mm × 14 mm), operating up to 50.33 MHz at 2.7–5.5 V, featuring 256 KB flash, 32 KB SRAM, 24-channel 12-bit ADC, dual analog comparators, and dual FTM modules - used in industrial motor control and embedded HMI systems.
For engineers reviewing the MCF51AC256BCLKE datasheet, MCF51AC256BCLKE pinout, MCF51AC256BCLKE application, or MCF51AC256BCLKE equivalent, key selection considerations include its CAN-disabled configuration, 80-pin LQFP footprint, V1 ColdFire ISA_C instruction set, 50.33 MHz core speed, and integrated peripherals including RGPIO, MCG, CRC, and SCI/FTM/ADC subsystems.
Technical Context
The MCF51AC256BCLKE 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. Its multipurpose clock generator (MCG) integrates FLL/PLL, crystal oscillator (XTAL/EXTAL), and low-power oscillator (LPO) for flexible clock sourcing across operational modes.
It features two independent flexible timer modules (FTM1 and FTM2), each supporting input capture, output compare, edge- or center-aligned PWM, deadtime insertion, and hardware-triggered ADC conversions. The 24-channel 12-bit ADC operates asynchronously for noise reduction and supports automatic compare interrupts and on-chip temperature sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ColdFire V1 32-bit RISC CPU with ISA_C instruction set, enabling deterministic real-time execution and efficient code density. |
| Max Core Frequency | 50.33 MHz at 2.7–5.5 V supply - defines maximum deterministic timing resolution for control loops and interrupt latency. |
| Flash / SRAM | 256 KB on-chip flash (read/program/erase over full temp/voltage range) and 32 KB SRAM - supports complex firmware with data buffering and secure storage. |
| ADC Resolution & Channels | 12-bit SAR ADC with 24 analog inputs, asynchronous clocking, and auto-compare interrupt - enables high-precision sensor acquisition in noisy environments. |
| Timer Modules | Dual FTM modules (FTM1: 6 channels; FTM2: 6 channels), each supporting PWM, input capture, deadtime, and ADC trigger - suitable for multi-axis motor control and power conversion. |
| Package | 80-pin LQFP, 14 mm × 14 mm, 0.5 mm pitch - provides ample I/O (69 GPIOs, 16 RGPIO pins) and thermal performance for industrial PCB layouts. |
| Operating Temp | –40°C to +85°C ambient - qualified for extended industrial temperature operation without derating. |
Pinout & Package
Package: 80-pin LQFP, 14 mm × 14 mm, 0.5 mm pitch, exposed pad (thermal enhancement). Pinout conforms to Figure 2 of Rev.7 datasheet, with dedicated signal groups for analog inputs (AD1P0–AD1P23), rapid GPIO (RGPIO0–RGPIO15), FTM channels (FTM1CH0–FTM1CH5, FTM2CH0–FTM2CH5), and serial interfaces (SCI1/SCI2, SPI1/SPI2, IIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PTA0–PTA7 | Port A general-purpose I/O with analog comparator outputs (ACMP2O), CAN TX/RX (not available on B variant) | Configurable digital I/O; ACMP2O enables external feedback routing; CAN pins omitted per part number B designation. |
| PTB0–PTB7 | Port B with TPM3 timer channels and ADC inputs AD1P0–AD1P7 | Supports high-speed timer capture and 8-channel analog sensing - critical for motor phase current sampling. |
| PTD0–PTD7 | Port D with ACMP1+, ACMP1−, ACMP1O, KBI, and ADC inputs AD1P8–AD1P15 | Enables dual analog comparator operation and keyboard interrupt wake-up - used in safety-critical threshold monitoring. |
| PTE0–PTE7 | Port E with RGPIO0–RGPIO7, SCI1, SPI1, and SS1 | RGPIO mode allows CPU-clock-speed toggling for bit-banged protocols or fast status signaling. |
| PTF0–PTF7 | Port F with RGPIO8–RGPIO15 and FTM1/FTM2 channels | Direct mapping to FTM PWM outputs - simplifies gate driver interfacing in inverter designs. |
| PTH0–PTH6 | Port H with FTM2CH2–FTM2CH5, SPSCK2, MOSI2, MISO2, PSTCLK | Supports second SPI interface with FIFO and 16-bit transfers - ideal for display or sensor hub communication. |
| PTJ0–PTJ7 | Port J with PST0–PST3 and DDATA0–DDATA3 | Parallel synchronous interface for high-throughput peripheral bridging (e.g., LCD controller or FPGA co-processor). |
Key Features
| Feature | Design Value |
|---|---|
| Rapid GPIO (RGPIO) | 16 pins accessible at CPU clock speed with atomic set/clear/toggle - eliminates software overhead in real-time I/O toggling (e.g., LED strobing or fault signaling). |
| Flexible Timer Modules (FTM) | Two independent 16-bit timers with 6 channels each, supporting complementary PWM with programmable deadtime - enables precise 3-phase inverter control without external logic. |
| Cyclic Redundancy Check (CRC) | Hardware-accelerated CRC16-CCITT generator with programmable seed - ensures integrity of firmware updates and EEPROM-stored calibration data. |
| Background Debug Module (BDM) | Single-wire debug interface with 6 hardware breakpoints and real-time trace buffer - enables non-intrusive debugging in resource-constrained embedded targets. |
| Multipurpose Clock Generator (MCG) | FLL/PLL with internal reference trimming (0.2% resolution), XTAL/EXTAL support, and LPO backup - delivers stable clocks across voltage/temp while minimizing external components. |
Applications
| Industrial Motor Control | Embedded Human-Machine Interface |
|---|---|
Use Scenario: Closed-loop control of BLDC or stepper motors in factory automation drives. IC Role / Device Role / Timing Role: Real-time execution of field-oriented control (FOC) algorithms using FTM-generated PWM, ADC-sampled current feedback, and RGPIO-based fault signaling. Use Value: 50.33 MHz V1 ColdFire core and dual FTM modules enable sub-microsecond PWM update and synchronized ADC sampling - critical for torque ripple reduction. | Use Scenario: Touch-enabled panel controller with local display, keypad, and serial connectivity to PLC. IC Role / Device Role / Timing Role: Host processor managing capacitive touch scanning (via ADC), parallel LCD interface (PTJ), and dual SCI links for Modbus RTU and diagnostics. Use Value: 24-channel ADC supports multi-point touch sensing; 69 GPIOs and PTJ parallel bus allow direct LCD/FPGA interfacing without glue logic. |
| Power Supply Monitoring System | Industrial Data Logger |
Use Scenario: DIN-rail mounted unit measuring AC line voltage/current, temperature, and relay status in UPS or PDU systems. IC Role / Device Role / Timing Role: Analog front-end controller acquiring isolated sensor signals via ADC and comparators, logging events via SPI-connected flash, and triggering alarms via RGPIO. Use Value: Dual analog comparators (ACMP1/ACMP2) provide hardware-level overvoltage/overcurrent trip detection with <1 µs response - faster than software polling. | Use Scenario: Standalone environmental logger capturing temperature, humidity, and vibration in manufacturing facilities. IC Role / Device Role / Timing Role: Low-power data aggregator using stop3 mode, RTC-interrupted wake-ups, and CRC-verified SD card writes via SPI2 FIFO. Use Value: Three low-power stop modes plus peripheral clock gating reduce active current to 2.5 mA @ 50 MHz - extends battery life in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Kinetis K22FN512VLH12 | ARM Cortex-M4F core, 120 MHz, 512 KB flash, 128 KB RAM, no PST/parallel bus, different pinout | Lacks PTJ parallel interface and PST clocking; requires redesign for LCD/FPGA bridging | Select if migrating to ARM ecosystem with higher performance and DSP capability; not drop-in compatible. |
| MCF51JM128CLK | ColdFire V1 core, 48 MHz, 128 KB flash, 16 KB RAM, 64-pin LQFP, no FTM2 or ACMP2 | Reduced memory, fewer timers, and missing analog comparator - insufficient for dual-loop motor control | Choose only for cost-sensitive, lower-feature variants where 256 KB flash and dual FTM are unnecessary. |
Compared with K22FN512VLH12 and MCF51JM128CLK, the MCF51AC256BCLKE uniquely retains the ColdFire V1 ISA_C compatibility, 80-pin parallel interface (PTJ), and dual FTM architecture - making it irreplaceable in legacy motor control and HMI designs requiring hardware-synchronized PWM and external bus expansion.
Availability
MCF51AC256BCLKE is available at Aetrix Electronics and suitable for industrial motor control, embedded HMI, power supply monitoring, and data logging applications requiring stable component supply, long-term lifecycle support, and verified industrial temperature qualification.
Supply support for MCF51AC256BCLKE 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 specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep heritage in microcontroller innovation through its acquisition of Freescale.
The MCF51AC256 series belongs to NXP's ColdFire microcontroller product line, designed specifically for seamless migration from 8-bit MC9S08 platforms to 32-bit performance while maintaining code compatibility and industrial-grade reliability.
FAQ
Does the MCF51AC256BCLKE include a CAN interface?
No, the MCF51AC256BCLKE does not include a CAN interface. The "B" in the part number explicitly denotes the CAN-disabled variant, confirmed in Table 1 and Section 1.4 of the Rev.7 datasheet. Pins PTA0 (TxCAN) and PTA1 (RxCAN) are reserved but non-functional on this device, and related MSCAN registers are not implemented.
What is the maximum operating frequency of the MCF51AC256BCLKE?
The MCF51AC256BCLKE operates at a maximum core frequency of 50.33 MHz across its full supply voltage range (2.7 V to 5.5 V) and temperature range (–40°C to +85°C), as specified in Section 1.3.1 and Table 16 of the Rev.7 datasheet.
Which package type and dimensions does the MCF51AC256BCLKE use?
The MCF51AC256BCLKE uses an 80-pin LQFP package measuring 14 mm × 14 mm with 0.5 mm pitch, as documented in Section 1.5 and Figure 2 of the Rev.7 datasheet. It includes an exposed thermal pad for enhanced heat dissipation in industrial applications.
How many analog-to-digital converter channels does the MCF51AC256BCLKE support?
The MCF51AC256BCLKE supports 24 analog input channels for its 12-bit ADC, as confirmed in Table 1 (Device Comparison) and Section 1.3.1 of the Rev.7 datasheet. These channels are mapped across Ports A, B, D, G, H, and J (AD1P0–AD1P23).
Is the MCF51AC256BCLKE pin-compatible with the MCF51AC256ACLKE?
Yes, the MCF51AC256BCLKE is pin-compatible with the MCF51AC256ACLKE, sharing identical 80-pin LQFP packaging, pin assignments, and electrical characteristics - differing only in the absence of CAN functionality and temperature grade (both rated –40°C to +85°C).
MCF51AC256BCLKE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-LQFP
- Series:
- MCF51AC
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- Coldfire V1
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, SCI, SPI
- Peripherals:
- LVD, PWM, WDT
- Number of I/O:
- 69
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 24x12b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCF51AC256BCLKE FAQ
1.How can I place an order for MCF51AC256BCLKE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCF51AC256BCLKE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCF51AC256BCLKE reliable?
The price and inventory of MCF51AC256BCLKE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCF51AC256BCLKE is usually 5 days.
3.What payment methods are accepted for MCF51AC256BCLKE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCF51AC256BCLKE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCF51AC256BCLKE?
MCF51AC256BCLKE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCF51AC256BCLKE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCF51AC256BCLKE?
For technical support, including MCF51AC256BCLKE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCF51AC256BCLKE requirements.
6.How does Aetrix verify that MCF51AC256BCLKE is sourced from the original manufacturer or authorized distributors?
All MCF51AC256BCLKE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCF51AC256BCLKE meets industry standards.
7.What is the process for return or replacement of MCF51AC256BCLKE?
All MCF51AC256BCLKE units undergo pre-shipment inspection (PSI). If there is an issue with MCF51AC256BCLKE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCF51AC256BCLKE part is unused and in its original packaging.
Return procedure for MCF51AC256BCLKE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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