MCF51MM256CMB - 50MHz ColdFire V1 256KB Flash MCU | NXP
MPN: MCF51MM256CMB ✓ פעילMCF51MM256CMB סקירה
What is a ColdFire V1 microcontroller? ColdFire is a 32-bit RISC instruction-set architecture originally developed by Freescale (now NXP) as a successor to the 68k family. The V1 core is the smallest and lowest-power ColdFire implementation, providing 32-bit processing capability with Thumb-like code density. MCUs in this category serve as system controllers in metering, motor control, and consumer products where deterministic 32-bit performance is required without the overhead of higher-tier Cortex-M cores.
Key features include 256 KB Flash program memory, 32 KB SRAM, an on-chip LCD driver, 16-bit SAR ADC, two analog comparators, and a multi-channel timer/PWM module. The device integrates a real-time clock, multiple low-power modes (Wait, Stop, Low-Power Run), and a flexible 48-pin I/O count. The ColdFire V1 core delivers 50 MHz operation from a 1.8 V to 3.6 V supply while maintaining static current consumption under 5 uA in Stop mode with RTC.
The MCF51MM256's architecture combines a V1 core with a peripheral set optimized for single-phase electricity meters: the ADC plus analog front end enables accurate active/reactive power and RMS voltage/current measurement, while the integrated LCD module can drive up to 8x40 segments typical for residential meter displays. The chip supports background-debug mode (BDM) and JTAG for development, and includes a hardware cryptographic acceleration unit for secure metering applications.
Typical applications include single-phase electricity meters, smart energy monitors, HVAC control panels, low-end motor controllers, and consumer appliances with LCD interfaces. The integrated analog chain (16-bit ADC + PGA + comparators) simplifies BOM in cost-sensitive metering designs.
When designing with the MCF51MM256, choose an external 32.768 kHz crystal for the RTC and ensure the BDM/JTAG header is accessible for firmware development. Decouple each VDD/VSS pair with a 100 nF ceramic placed within 3 mm of the ball, and provide a 4.7 uF bulk cap near the package to support the LCD charge pump during display refresh.
חלופות תחליף ישיר עבור MCF51MM256CMB — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MCF51MM256CMB (אותו גורם צורה וטביעת רגל) — שונים ב Core Architecture, Mounting Type, Supply Voltage, Package, Program Memory Size.
MCF51MM256VML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MCF51MM256CLB
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MCF51MM256CMD
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MCF51MM256CMB דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | ColdFire V1 (32-bit RISC) |
| תדר שעון מקסימלי | 50 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM Size | 32 KB (32K x 8) |
| Number of I/O | 48 |
| מארז / Case | 81-MAPBGA (10x10 mm) |
| Oscillator Type | External |
| מתח אספקה | 1.8 V to 3.6 V |
| טמפרטורת פעולה | -40 C to +85 C |
| Peripherals | LCD, 16-bit SAR ADC, Analog Comparators, PWM/Timer, RTC |
| Connectivity | I2C, SCI (UART), SPI, I2S |
| Data Converters | 16-bit SAR ADC, 12-bit DAC |
| Program Memory Type | FLASH |
| סוג הרכבה | Surface Mount |
| רמת MSL | 3 (per JEDEC J-STD-020) |
| סטטוס RoHS | Compliant |
תצורת פינים של MCF51MM256CMB
| פין A1 | VDD — Power supply (1.8 V to 3.6 V) |
| פין A2 | VSS — Ground |
| פין A3 | PTB0 — Port B bit 0 / ADC channel |
| פין A4 | PTB1 — Port B bit 1 |
| פין A5 | PTB2 — Port B bit 2 |
| פין A6 | PTB3 — Port B bit 3 |
| פין A7 | PTB4 — Port B bit 4 |
| פין A8 | PTB5 — Port B bit 5 |
| פין A9 | PTB6 — Port B bit 6 |
| פין B1 | PTA0 — Port A bit 0 |
| פין B2 | PTA1 — Port A bit 1 |
| פין B3 | PTA2 — Port A bit 2 |
| פין B4 | PTA3 — Port A bit 3 |
| פין B5 | PTA4 — Port A bit 4 |
| פין B6 | PTA5 — Port A bit 5 |
| פין B7 | PTA6 — Port A bit 6 |
| פין B8 | PTA7 — Port A bit 7 |
| פין B9 | PTC0 — Port C bit 0 |
| פין C1 | PTC1 — Port C bit 1 |
| פין C2 | PTC2 — Port C bit 2 |
| פין C3 | PTC3 — Port C bit 3 |
| פין C4 | PTC4 — Port C bit 4 |
| פין C5 | PTC5 — Port C bit 5 |
| פין C6 | PTC6 — Port C bit 6 |
| פין C7 | PTC7 — Port C bit 7 |
| פין C8 | PTD0 — Port D bit 0 |
| פין C9 | PTD1 — Port D bit 1 |
| פין D1 | PTD2 — Port D bit 2 |
| פין D2 | PTD3 — Port D bit 3 |
| פין D3 | PTD4 — Port D bit 4 |
| פין D4 | PTD5 — Port D bit 5 |
| פין D5 | PTD6 — Port D bit 6 |
| פין D6 | PTD7 — Port D bit 7 |
| פין D7 | PTE0 — Port E bit 0 |
| פין D8 | PTE1 — Port E bit 1 |
| פין D9 | PTE2 — Port E bit 2 |
| פין E1 | PTE3 — Port E bit 3 |
| פין E2 | PTE4 — Port E bit 4 |
| פין E3 | PTE5 — Port E bit 5 |
| פין E4 | PTE6 — Port E bit 6 |
| פין E5 | PTE7 — Port E bit 7 |
| פין E6 | PTF0 — Port F bit 0 |
| פין E7 | PTF1 — Port F bit 1 |
| פין E8 | PTF2 — Port F bit 2 |
| פין E9 | PTF3 — Port F bit 3 |
| פין F1 | PTF4 — Port F bit 4 |
| פין F2 | PTF5 — Port F bit 5 |
| פין F3 | PTF6 — Port F bit 6 |
| פין F4 | PTF7 — Port F bit 7 |
| פין F5 | LCD0 — LCD segment driver |
| פין F6 | LCD1 — LCD segment driver |
| פין F7 | LCD2 — LCD segment driver |
| פין F8 | LCD3 — LCD segment driver |
| פין F9 | LCD4 — LCD segment driver |
| פין G1 | LCD5 — LCD segment driver |
| פין G2 | LCD6 — LCD segment driver |
| פין G3 | LCD7 — LCD segment driver |
| פין G4 | LCD8 — LCD segment driver |
| פין G5 | LCD9 — LCD segment driver |
| פין G6 | LCD10 — LCD segment driver |
| פין G7 | LCD11 — LCD segment driver |
| פין G8 | LCD12 — LCD segment driver |
| פין G9 | LCD13 — LCD segment driver |
| פין H1 | VDDA — Analog supply |
| פין H2 | VSSA — Analog ground |
| פין H3 | VREFH — ADC reference high |
| פין H4 | VREFL — ADC reference low |
| פין H5 | EXTAL — External crystal input |
| פין H6 | XTAL — External crystal output |
| פין H7 | RESET — Reset input (active low) |
| פין H8 | BKGD — Background Debug Mode |
| פין H9 | VSS — Ground |
| פין J1 | TCLK — Timer clock input |
| פין J2 | IRQ — External interrupt request |
| פין J3 | NC — Not connected (per datasheet) |
| פין J4 | NC — Not connected (per datasheet) |
| פין J5 | NC — Not connected (per datasheet) |
| פין J6 | NC — Not connected (per datasheet) |
| פין J7 | NC — Not connected (per datasheet) |
| פין J8 | NC — Not connected (per datasheet) |
| פין J9 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
MCF51MM256CMB מתאים עבור 6 יישוםs: Single-Phase Electricity Meter, Smart Energy Monitor / Home Energy Display, HVAC Control Panel, Low-End Motor Controller, Consumer Appliance with LCD UI, Industrial Sensor / Data Logger.
Single-Phase Electricity Meter
The MCF51MM256CMB was designed from the ground up for single-phase residential electricity meters, and the integration pays off directly here. Its on-chip 16-bit SAR ADC with programmable gain amplifier, combined with two analog comparators, lets designers measure shunt-derived current and divider-derived voltage without an external metering ASIC - cutting BOM cost and PCB area. The integrated LCD driver (up to 8x40 segments per the NXP MCF51MM256 datasheet) drives the meter's display directly, while the 50 MHz ColdFire V1 core executes real-time active/reactive power and RMS calculations with deterministic timing. The 256 KB Flash accommodates metering firmware stacks plus tamper-detection logic, and the 32 KB SRAM buffers measurement samples and rolling energy data. Low-power modes (Wait, Stop, Low-Power Run) with sub-5 uA Stop current enable battery-backed meter endpoints that retain RTC time across line-power outages.
מומלץ
Smart Energy Monitor / Home Energy Display
Smart plug and home energy monitor products benefit from the MCF51MM256CMB's metering-grade analog front end and integrated LCD controller. Designers can read CT-based current sensors or shunt resistors directly into the 16-bit ADC with the on-chip PGA, eliminating an external analog front-end IC. The ColdFire V1 core at 50 MHz handles RMS and power-factor calculations in real time, while the 32 KB SRAM buffers rolling energy data for non-volatile storage. The integrated LCD driver supports low-cost monochrome segment displays common in wall-mounted home energy displays, and the part's 1.8 V to 3.6 V supply range matches USB- or battery-powered designs. I2C and SPI interfaces connect to wireless modules (Wi-Fi, Zigbee, Sub-GHz) for cloud connectivity, while the RTC timestamps consumption events for time-of-use billing.
מומלץ
HVAC Control Panel
The MCF51MM256CMB fits HVAC control panels that need a 32-bit core, an LCD for the user interface, and robust analog inputs for temperature and pressure sensors. The ColdFire V1 core executes PID loops for compressor and fan control at 50 MHz with deterministic interrupt latency. The integrated 16-bit ADC reads thermistor, RTD, and pressure transducer signals directly, while the on-chip comparators enable over-temperature and over-current protection without external analog parts. The LCD driver simplifies thermostat display boards by removing the need for a separate LCD controller IC. With 256 KB Flash, designers can fit full HVAC state machines plus Modbus or BACnet application stacks, and 48 I/O pins accommodate relay drivers, triac interfaces, and keypad scanning. The -40 C to +85 C operating range covers basement and rooftop control environments.
מומלץ
Low-End Motor Controller
Low-end brushless DC and stepper motor drives use the MCF51MM256CMB to combine a 32-bit control core with an integrated ADC and PWM channels. The ColdFire V1 core executes field-oriented control or trapezoidal commutation algorithms in real time, while the on-chip PWM modules drive the gate drivers directly. Back-EMF and current-shunt feedback enter the 16-bit ADC and comparators, providing the over-current and stall-protection loops. The 256 KB Flash accommodates lookup tables, PI tuning, and fault-handling code; the 32 KB SRAM retains diagnostic logs. The 81-MAPBGA package keeps the controller compact for integrated motor control PCBs, while the 1.8 V to 3.6 V supply simplifies design when powered from a single 3.3 V rail. The integrated RTC supports scheduled on/off cycles for pumps and fans.
מומלץ
Consumer Appliance with LCD UI
Consumer appliances such as washing machines, microwave ovens, and induction cooktops benefit from the MCF51MM256CMB's combination of LCD driver, 16-bit ADC, and 32-bit core. The ColdFire V1 core runs appliance state machines and user-interface logic, while the LCD driver directly drives the segment display typically mounted on the front panel - eliminating a discrete LCD controller. The on-chip ADC reads thermistor inputs for cooking or wash-temperature regulation, and the analog comparators handle over-temperature and zero-cross detection for triac-driven heating elements. 256 KB Flash accommodates menu structures, fault logs, and field-updatable firmware via UART bootloader. The wide 1.8 V to 3.6 V supply and -40 C to +85 C temperature range suit the appliance operating environment.
מומלץ
Industrial Sensor / Data Logger
Industrial sensor heads and data loggers use the MCF51MM256CMB when they need a 32-bit core, on-chip ADC, and RTC in a single BGA. The ColdFire V1 core at 50 MHz executes sensor linearization, statistical filtering, and SD-card write streams, while the integrated 16-bit ADC reads multiple sensor channels with PGA gain. The on-chip RTC provides accurate timestamps for logged events, and the RTC domain retains time across power cycles in Stop mode (<5 uA). The 256 KB Flash fits loggers with local configuration storage and Modbus RTU stacks, while 32 KB SRAM buffers incoming samples before flushing to non-volatile storage. The 81-MAPBGA (10x10 mm) footprint suits compact industrial enclosures, and the -40 C to +85 C temperature range covers outdoor and factory-floor installations.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MCF51MM256CMB — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MCF51MM256VML | MCF51MM256CLB | MCF51MM256CMD |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 81-MAPBGA (10x10 mm) | 81-LQFP (different land pattern - PCB rework required) | 81-MAPBGA (same as CMB) | 81-MAPBGA (same as CMB) |
| Core | ColdFire V1 | ColdFire V1 (same) | ColdFire V1 (same) | ColdFire V1 (same) |
| Max CPU Clock | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Form | Tray | Tray | Tray | Tape and Reel |
| Distinctive Variant | Standard power-on default | LQFP-package variant | Low-power-mode boot default | Tape & reel packaging option |
מבדילים עיקריים
- On-chip metering-grade analog front end (לעומתMCF51AC256 (ColdFire V1 general-purpose MCU))
- Integrated LCD driver for segment displays (לעומתMCF51JE128 (industrial Ethernet MCU))
- Sub-5 uA Stop-mode current with RTC retention (לעומתMC9S08QE128 (8-bit HCS08 metering MCU))
הערות תכנון
Place one 100 nF X7R ceramic decoupling capacitor within 3 mm of every VDD/VSS ball pair of the 81-MAPBGA, and add a single 4.7 uF X5R bulk cap near the package. The integrated LCD charge pump draws pulsed current during segment refresh - insufficient bulk capacitance will cause display contrast modulation visible as flicker. Route the analog VREFH/VREFL traces as a guarded differential pair away from digital switching signals.
The 81-MAPBGA (10x10 mm) uses a 1.0 mm ball pitch - follow IPC-7351 land pattern recommendations with NSMD pads and a 0.4 mm solder-mask opening. Provide a via-in-pad or microvia escape pattern on inner layers for clean ground returns, and dedicate one solid inner plane under the BGA as the ground reference for the analog front end. Keep the EXTAL/XTAL traces short and symmetric to minimize oscillator jitter that affects ADC timing accuracy.
Do not connect the BKGD (Background Debug Mode) pin to VDD through a pull-up without consulting the NXP MCF51MM256 Reference Manual - the BDM handshake requires the pin to be open-drain or tri-state at reset. Forgetting to disable the on-chip voltage regulator (if used) before entering Stop mode can leave the RTC domain partially powered and inflate standby current. Always include a 32.768 kHz external crystal on EXTAL/XTAL if RTC accuracy matters, because the internal oscillator is not precise enough for time-of-use metering.
Estimated: when sampling the 16-bit SAR ADC at the maximum rate (~200 kSps) while simultaneously driving the LCD charge pump and PWM channels, switching noise on VDD can alias into ADC results. Place an RC low-pass (10 ohm + 10 uF) between the digital and analog VDD planes if ADC ENOB degrades more than 1 bit under load. Use the on-chip PGA gain setting that lets the input signal span at least 80 percent of the ADC full scale to maximize SNR.
מידע על תאימות
RoHS compliance per NXP product page and DigiKey parametric listing. Not AEC-Q100 qualified - this is an industrial/consumer metering MCU, not an automotive grade. Halogen-free status not explicitly stated in retrieved data. MSL 3 per JEDEC J-STD-020 moisture sensitivity classification.