MCF51EM256CLL - 32-bit ColdFire V1 MCU 50MHz 256KB Flash | NXP
N.º de pieza: MCF51EM256CLL ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
MCF51EM256CLL Descripción general
A 32-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single chip, sitting within the broader hierarchy of embedded processors: MCU -> RISC microprocessor -> system-on-chip. The ColdFire V1 family derives from the Motorola 68000 architecture, delivering deterministic single-cycle execution for cost-sensitive embedded control.
Key features of the MCF51EM256CLL include the 256KB (256K x 8) Flash program memory, the 50 MHz ColdFire V1 RISC core, an integrated segment LCD driver for meter displays, and dedicated metrology peripherals that reduce external component count in polyphase and single-phase energy meters.
The metrology-focused architecture places ADC channels, reference circuitry, and timing resources close to the core, enabling accurate current and voltage sampling with low phase error. This allows a single chip to perform energy computation, display driving, and communication management simultaneously, which is the defining advantage of the smart-meter-on-a-chip concept originally introduced by Freescale Semiconductor, now NXP.
Typical applications include polyphase (three-phase) and single-phase smart energy meters, prepaid electricity meters, industrial submetering, and power-quality monitoring equipment. NXP also published an MCF51EM256-based polyphase energy meter reference design for 220V systems to accelerate development.
Designers should note this part carries NXP End-of-Life status; last-time-buy planning and second-source qualification are essential for new designs. Verify stock and replacement strategy before committing to new PCB layouts.
This page synthesizes distributor availability data, lifecycle status, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet.
Alternativas directas para MCF51EM256CLL — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MCF51EM256CLL (mismo factor de forma y huella) — difiere en Mounting Type, Core Architecture, Package, Supply Voltage, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MCF51EM256VLL
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCF51MM256CML
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$9.28 / unidad
Ver hoja de datos →MCF51MM256VML
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$9.2 / unidad
Ver hoja de datos →MCF51MM256CMB
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$7.4 / unidad
Ver hoja de datos →MCF51EM256CLL Valores máximos y características eléctricas
| Core Processor | ColdFire V1 |
| Core Architecture | 32-bit RISC |
| Frecuencia de reloj máxima | 50 MHz |
| Flash Memory Size | 256 KB (256K x 8) |
| ADC Resolution | 16-bit |
| LCD Controller | Integrated segment LCD controller |
| Target Application Family | Smart meter / metrology |
| Encapsulado | 100-LQFP (14x14 mm) |
| Tipo de montaje | Surface Mount |
| Estado del ciclo de vida | End of Life (per NXP product page) |
Guía de configuración de pines de MCF51EM256CLL 100-lqfp (14x14 mm)
Configuración de pines para MCF51EM256CLL (encapsulado 100-lqfp (14x14 mm)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para MCF51EM256CLL.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MCF51EM256CLL es adecuado para 6 aplicacións: Polyphase Smart Energy Meter, Single-Phase Residential Smart Meter, Prepaid Electricity Meters, Industrial Submetering Equipment, Power Quality Monitoring Devices, Street Lighting and Load Management Meters.
Polyphase Smart Energy Meter
The MCF51EM256CLL was purpose-built for polyphase (three-phase) energy metering. Its 16-bit ADC samples multiple voltage and current channels with the resolution and timing consistency needed for accurate active and reactive energy computation, while the integrated metrology peripherals offload measurement tasks from the ColdFire V1 core running at 50 MHz. The embedded LCD controller directly drives the meter's segment display, eliminating external display drivers and reducing bill-of-materials cost. NXP validated this use case with an MCF51EM256-based Poly Phase Energy Meter Reference Design for 220V systems, which provides a proven analog front-end, firmware architecture, and calibration approach. Designers gain a single-chip solution combining metrology computation, display, and communication interfaces in one 100-LQFP package, though EOL status requires a last-time-buy or migration plan for continuing products.
Recomendado
Single-Phase Residential Smart Meter
For single-phase residential smart meters, the MCF51EM256CLL delivers the same smart-meter-on-a-chip integration at lower channel count: the 16-bit ADC handles one voltage and one current sampling path with adequate resolution for utility-class accuracy, while the LCD controller drives the customer-facing display. The 256KB Flash accommodates metering firmware, tariff tables, communication protocol stacks (such as DLMS/COSEM class implementations), and data logging simultaneously, avoiding external memory in cost-sensitive residential designs. The ColdFire V1 core at 50 MHz provides headroom for encryption and protocol processing alongside real-time metrology sampling. Because the part is End-of-Life, residential meter manufacturers should secure channel stock for field-service spares while qualifying the Kinetis-based metering platform for future production runs.
Recomendado
Prepaid Electricity Meters
Prepaid meters require secure token validation, local display feedback, and reliable energy measurement in a single controller - exactly the MCF51EM256CLL's profile. The 256KB Flash stores both the metrology firmware and security/authentication code, while the LCD controller renders credit balance and consumption information without external display ICs. The 50 MHz ColdFire V1 core executes token decryption and validation routines with sufficient margin alongside continuous energy sampling by the 16-bit ADC. Integrated communication interfaces support the load-switch control and data exchange paths typical of prepaid infrastructures. Developers can leverage NXP's MCF51EM256 reference design as a starting point. Since the device is End-of-Life, prepaid meter platforms should plan firmware-porting effort toward a supported NXP MCU family as part of any new program.
Recomendado
Industrial Submetering Equipment
Industrial submeters monitor energy consumption per machine, department, or tenant, and the MCF51EM256CLL fits this role with its integrated metrology peripherals and 16-bit ADC providing utility-grade measurement accuracy at panel-level cost. The embedded LCD controller supports local readout panels, while the 256KB Flash holds multi-tariff logging and communication firmware simultaneously. The 50 MHz ColdFire V1 RISC core offers deterministic execution for real-time sampling loops, and the 100-LQFP (14x14 mm) surface-mount package suits compact DIN-rail and panel-mounted submeter form factors. Submetering products have long field lifetimes, so the End-of-Life status makes component obsolescence risk management critical: engineers should implement last-time-buys sized to the service life and begin qualification of supported replacements from NXP's current metering portfolio.
Recomendado
Power Quality Monitoring Devices
Power quality analyzers need simultaneous, accurately timed sampling of voltage and current channels to compute sag/swell events, harmonics, and power factor - tasks the MCF51EM256CLL's 16-bit ADC and metrology peripherals support directly. The 50 MHz ColdFire V1 core provides computational headroom for RMS tracking and event flagging while the LCD controller drives local indication. With 256KB Flash, the device can buffer event logs and run communication stacks in parallel. For portable power-quality instruments, the single-chip integration reduces analog component count and board area compared to discrete front-end plus MCU architectures. Note that the sampling performance of any final design depends on the ADC configuration details specified in the MCF51EM256 datasheet, which should be consulted for channel sequencing and conversion timing parameters during design.
Recomendado
Street Lighting and Load Management Meters
Municipal street-lighting controllers and load-management meters combine energy measurement with scheduling and communication - a workload the MCF51EM256CLL handles on one chip. The 16-bit ADC measures lamp current and supply voltage for consumption billing, the LCD controller provides local status display, and the 256KB Flash stores astronomical scheduling tables, metering firmware, and protocol stacks together. The 50 MHz ColdFire V1 core concurrently services real-time sampling and communication interrupts with predictable latency. These deployments run for 15-20 years in the field, which makes the device's End-of-Life status particularly consequential: operators should bank spare inventory now and qualify a supported successor (such as NXP's Kinetis metering family) for future controller revisions to protect the installed base.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCF51EM256CLL — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCF51EM256VLL | MCF51MM256CML | MCF51MM256VML | MCF51MM256CMB |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | ColdFire V1, 32-bit | ColdFire V1, 32-bit | ColdFire V1, 32-bit | ColdFire V1, 32-bit | ColdFire V1, 32-bit |
| Max Clock Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| Metrology / LCD Peripherals | Metrology peripherals + integrated LCD controller | Metrology peripherals + integrated LCD controller | MM peripheral set - verify LCD/metrology mapping | MM peripheral set - verify LCD/metrology mapping | MM peripheral set - verify LCD/metrology mapping |
| Lifecycle Status | End of Life | End of Life (same family) | End of Life (same generation) | End of Life (same generation) | End of Life (same generation) |
Diferenciadores clave
- Metrology-specific peripheral set (frente a MCF51MM256CML)
- Single-chip smart meter integration (frente a General-purpose ColdFire MCUs (e.g., MCF51AC family))
- Established reference design ecosystem (frente a MCF51MM256VML)
Notas de diseño
The MCF51EM256CLL is End-of-Life per the NXP product page, which also references a discontinuance and replacement product change notice. Before continuing any design, confirm whether your order falls inside or after the final last-time-buy window. For production programs, size your last-time-buy to cover the full field-service life (metering deployments often run 15+ years), and start qualifying the pin-compatible alternatives listed on this page or NXP's current metering portfolio. Never assume distributor stock today implies stock availability in a later build cycle.
Metrology accuracy in energy meters depends heavily on the analog front-end around the 16-bit ADC. Keep voltage-divider and current-sense routing away from LCD segment drive lines, which carry fast switching edges to the display glass. Use star grounding for the analog measurement section and follow the MCF51EM256-based Poly Phase Energy Meter Reference Design layout from Freescale/NXP, which demonstrates proper separation of metering analog inputs from digital and display circuitry. Calibrate phase error in firmware during production, since ADC channel timing skew directly affects power-factor accuracy at low power factors.
The 100-LQFP (14x14 mm) package places many LCD segment pins along all four sides; plan your PCB stack-up so the display glass connector sits adjacent to the LCD pins to avoid long segment traces that increase crosstalk and EMI. Decouple every VDD pin pair with 100 nF ceramics placed within 2 mm of the pins, per standard Freescale/NXP ColdFire layout practice. If migrating to the MCF51MM256 family later, the LQFP-100 footprint reuse is the main benefit, but confirm pin function mapping in the MM datasheet before pouring copper.
Información de cumplimiento
Compliance status not stated in the verified web data; consult the NXP product page's Environmental Quality section for the MCF51EM256CLL.