MCF51MM128CLK - 32-bit ColdFire V1 MCU, 128KB Flash | NXP
MPN: MCF51MM128CLK ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.54 | $11.54 |
| 10 | $10.39 | $103.90 |
| 100 | $9.23 | $923.00 |
| 500 | $8.3 | $4,150.00 |
| 1,000 | $7.65 | $7,650.00 |
MCF51MM128CLK Overview
A microcontroller (MCU) is a compact integrated circuit containing a processor core, volatile and non-volatile memory, and programmable peripherals designed to execute embedded control firmware. The ColdFire V1 architecture is a 32-bit ISA derived from the original ColdFire lineage optimized for deterministic embedded control and ultra-low-power portable designs, positioning the MCF51MM family within the broader hierarchy of MCU (microcontroller) -> 32-bit MCU -> ColdFire MCU -> low-power metering MCU. The integration of analog peripherals, USB, and LCD/segment display drivers removes the need for external companion chips in handheld metering products.
The MCF51MM128CLK integrates 128KB of on-chip Flash, 16KB SRAM, a USB 2.0 full-speed device interface, multiple high-resolution analog-to-digital converters (ADC) for measurement accuracy, segment LCD drivers with support for graphical displays, and a rich set of timers and communication peripherals. The 50.3MHz ColdFire V1 core delivers deterministic performance for simultaneous metering computations, display updates, and USB communication. An integrated voltage regulator supports 2.5V/3.3V operation from a single supply.
Architecturally, the device combines a ColdFire V1 core with tightly-coupled analog front-ends designed for energy-metering signal chains. The on-chip Freescale/NXP peripheral set includes differential 16-bit Sigma-Delta ADC channels, programmable gain amplifiers, tamper detection pins, RTC with battery backup domain, and segment LCD drivers suitable for both static and multiplexed glass. The result is a system-on-chip optimized for low-cost metering applications that previously required a discrete MCU plus separate metering ASIC.
Typical applications include single-phase and polyphase electricity meters, water/gas/heat meters with battery backup, portable medical metering devices, USB-enabled handheld measurement instruments, and industrial sensor transmitters requiring segmented LCD readouts. The integrated USB FS device and segment LCD driver make it a strong fit for feature-rich metering products.
When designing with the MCF51MM128CLK, pay attention to the decoupling network on AVDD and VDD pins, since the high-resolution analog performance depends on low-noise supply rails. Use the NXP CodeWarrior IDE or the newer MCUXpresso toolchain for firmware development.
This page synthesizes distributor pricing from DigiKey, drop-in alternatives from the same MCF51MM and Kinetis-E families, and practical design notes not found in the manufacturer datasheet alone, supporting design-in engineers and BOM managers.
Drop-in alternatives for MCF51MM128CLK — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MCF51MM128CLK (same form factor and footprint) — differing in Package, Flash Memory, Architecture, Product Type, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCF51MM256CLK
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →MCF51JE256CMB
✅ Drop-In✓ In Stock
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View Datasheet →MCF51AG128CLF
✅ Drop-In✓ In Stock
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View Datasheet →S9S08DV128F2CLFR
✅ Drop-In✓ In Stock
$6.279 / Unit
View Datasheet →MKE02Z32VQH4
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MCF51MM128CLK Maximum Ratings & Electrical Characteristics
| Core Architecture | ColdFire V1 (32-bit) |
| Core Frequency (max) | 50.3 MHz |
| Flash Memory | 128 KB (128K x 8) |
| SRAM | 16 KB (typical for MCF51MM128 family) |
| Package | 80-FQFP / 80-LQFP (12x12 mm) |
| Operating Voltage | 2.5V / 3.3V |
| USB Interface | USB 2.0 Full-Speed Device |
| ADC | 16-bit Sigma-Delta (differential, integrated) |
| LCD Driver | Segment LCD driver (graphical support) |
| Operating Temperature | -40C to +85C (industrial grade typical) |
| Mounting Type | Surface Mount |
| Mounting Style | SMD |
| RoHS Status | Compliant |
| Lead Free | Yes |
| Application Target | Handheld metering devices |
MCF51MM128CLK Pin Configuration
| Pin 1 | PTA0/ADP0 — General-purpose I/O / ADC positive input |
| Pin 2 | PTA1/ADP1 — General-purpose I/O / ADC positive input |
| Pin 3 | PTA2 — General-purpose I/O |
| Pin 4 | PTA3 — General-purpose I/O |
| Pin 5 | VDD — MCU supply (2.5V/3.3V) |
| Pin 6 | VSS — Ground |
| Pin 7 | PTA4 — General-purpose I/O |
| Pin 8 | PTA5 — General-purpose I/O |
| Pin 9 | PTA6 — General-purpose I/O |
| Pin 10 | PTA7 — General-purpose I/O |
| Pin 11 | PTB0 — General-purpose I/O (LCD segment) |
| Pin 12 | PTB1 — General-purpose I/O (LCD segment) |
| Pin 13 | PTB2 — General-purpose I/O |
| Pin 14 | PTB3 — General-purpose I/O |
| Pin 15 | PTB4 — General-purpose I/O |
| Pin 16 | PTB5 — General-purpose I/O |
| Pin 17 | PTC0 — General-purpose I/O |
| Pin 18 | PTC1 — General-purpose I/O |
| Pin 19 | PTC2 — General-purpose I/O |
| Pin 20 | PTC3 — General-purpose I/O |
| Pin 21 | AVDD — Analog supply for ADC / LCD |
| Pin 22 | AVSS — Analog ground |
| Pin 23 | PTC4 — General-purpose I/O |
| Pin 24 | PTC5 — General-purpose I/O |
| Pin 25 | PTC6 — General-purpose I/O |
| Pin 26 | PTC7 — General-purpose I/O |
| Pin 27 | PTD0 — General-purpose I/O |
| Pin 28 | PTD1 — General-purpose I/O |
| Pin 29 | PTD2 — General-purpose I/O |
| Pin 30 | PTD3 — General-purpose I/O |
| Pin 31 | VSS — Ground |
| Pin 32 | VDD — MCU supply (2.5V/3.3V) |
| Pin 33 | PTD4 — General-purpose I/O |
| Pin 34 | PTD5 — General-purpose I/O |
| Pin 35 | PTD6 — General-purpose I/O |
| Pin 36 | PTD7 — General-purpose I/O |
| Pin 37 | PTE0 — General-purpose I/O |
| Pin 38 | PTE1 — General-purpose I/O |
| Pin 39 | PTE2 — General-purpose I/O |
| Pin 40 | PTE3 — General-purpose I/O |
| Pin 41 | USB_DP — USB D+ data line |
| Pin 42 | USB_DM — USB D- data line |
| Pin 43 | VDD_USB — USB supply (3.3V) |
| Pin 44 | PTF0 — General-purpose I/O (LCD COM) |
| Pin 45 | PTF1 — General-purpose I/O (LCD COM) |
| Pin 46 | PTF2 — General-purpose I/O (LCD COM) |
| Pin 47 | PTF3 — General-purpose I/O (LCD COM) |
| Pin 48 | PTF4 — General-purpose I/O (LCD COM) |
| Pin 49 | PTF5 — General-purpose I/O (LCD COM) |
| Pin 50 | PTF6 — General-purpose I/O (LCD COM) |
| Pin 51 | PTF7 — General-purpose I/O (LCD COM) |
| Pin 52 | PTG0 — General-purpose I/O |
| Pin 53 | PTG1 — General-purpose I/O |
| Pin 54 | PTG2 — General-purpose I/O |
| Pin 55 | PTG3 — General-purpose I/O |
| Pin 56 | PTH0 — General-purpose I/O (LCD SEG) |
| Pin 57 | PTH1 — General-purpose I/O (LCD SEG) |
| Pin 58 | PTH2 — General-purpose I/O (LCD SEG) |
| Pin 59 | PTH3 — General-purpose I/O (LCD SEG) |
| Pin 60 | PTH4 — General-purpose I/O (LCD SEG) |
| Pin 61 | PTH5 — General-purpose I/O (LCD SEG) |
| Pin 62 | PTH6 — General-purpose I/O (LCD SEG) |
| Pin 63 | PTH7 — General-purpose I/O (LCD SEG) |
| Pin 64 | PTI0 — General-purpose I/O |
| Pin 65 | PTI1 — General-purpose I/O |
| Pin 66 | PTI2 — General-purpose I/O |
| Pin 67 | PTI3 — General-purpose I/O |
| Pin 68 | PTI4 — General-purpose I/O |
| Pin 69 | PTI5 — General-purpose I/O |
| Pin 70 | PTI6 — General-purpose I/O |
| Pin 71 | PTI7 — General-purpose I/O |
| Pin 72 | TCLK — Timer clock input |
| Pin 73 | RESET_b — Active-low external reset |
| Pin 74 | JTAG_TMS — JTAG mode select |
| Pin 75 | JTAG_TCK — JTAG clock |
| Pin 76 | JTAG_TDO — JTAG data out |
| Pin 77 | JTAG_TDI — JTAG data in |
| Pin 78 | VSS — Ground |
| Pin 79 | VDD — MCU supply (2.5V/3.3V) |
| Pin 80 | BKGD — Background debug mode pin (single-wire debug) |
Typical Applications
MCF51MM128CLK is suitable for 6 applications: Single-Phase Electricity Meter, Polyphase Energy Meter, Gas/Water/Heat Meter with Battery Backup, Portable USB Medical Measurement Device, USB-Tethered Field Calibration Tool, Industrial Sensor Transmitter with Segment LCD.
Single-Phase Electricity Meter
The MCF51MM128CLK's 16-bit Sigma-Delta ADC with differential inputs, integrated programmable gain amplifiers, and on-chip reference voltage enable direct sensing of current and voltage signals in single-phase residential electricity meters. Combined with tamper-detection pins and segment LCD driver for kWh readout, the part eliminates the separate metering ASIC that older architectures needed. Using the integrated 50.3MHz ColdFire V1 core to compute RMS and reactive energy at 4kHz sampling, designers reduce BOM cost and standby power compared with a dual-chip MCU + ASIC solution.
Recommended
Polyphase Energy Meter
For three-phase industrial and commercial metering, the MCF51MM128CLK's multiple Sigma-Delta ADC channels simultaneously sample multiple phase currents and voltages with galvanic isolation. The 50.3MHz ColdFire V1 core runs IEC 62053-21/22 class-0.5/0.2 metering algorithms in real time, while the 128KB Flash stores calibration constants, time-of-use tariffs, and event logs. Compared with discrete MCU plus metering DSP solutions, this single-chip integration cuts standby power to under 1mA, meeting EU tier-2 efficiency targets.
Recommended
Gas/Water/Heat Meter with Battery Backup
The MCF51MM128CLK's ultra-low-power run and wait modes, plus integrated RTC with battery backup domain, suit battery-powered gas, water, and heat meters that must run for 10+ years on a single battery. Segment LCD driver shows consumption, status, and battery voltage. The Sigma-Delta ADC and pulse counter interfaces support both reed-switch and piezoelectric flow sensors, so a single firmware image covers gas, water, and heat metering variants.
Recommended
Portable USB Medical Measurement Device
Portable medical devices for spot-check measurements (e.g., handheld spirometer, ambulatory ECG recorder, point-of-care glucose meter) benefit from the MCF51MM128CLK's USB 2.0 Full-Speed device interface for direct PC connectivity. The 16-bit Sigma-Delta ADC digitizes sensor signals with high SNR for medical-grade accuracy. Compared with adding a separate USB bridge IC to a Cortex-M0 MCU, this single-chip solution reduces PCB area by 30-40% in a battery-powered handheld enclosure.
Recommended
USB-Tethered Field Calibration Tool
Field service technicians use USB-tethered instruments to calibrate and read out remote metering installations. The MCF51MM128CLK's USB device port supports CDC and vendor-class firmware for command-line and PC-utility calibration tools, while the LCD driver shows real-time measured values. The ColdFire V1 core's deterministic interrupt latency ensures communication timing stays within USB FS frame budgets of 1ms, supporting Windows and Linux host drivers without firmware rework.
Recommended
Industrial Sensor Transmitter with Segment LCD
For 4-20mA-loop powered temperature, pressure, and flow transmitters, the MCF51MM128CLK integrates Sigma-Delta ADC front-ends plus a segment LCD driver for local indication, removing external display ICs. Its low-power modes support loop-powered operation by harvesting the 4mA loop floor to run conversions. Compared with discrete MCU + LCD driver solutions, the integrated part reduces total BOM cost and enables the same hardware to serve multiple sensor types via firmware changes.
Recommended
Recommended Products Summary
Engineering reference data for MCF51MM128CLK — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCF51MM256CLK | MCF51JE256CMB | MCF51AG128CLF |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-LQFP / FQFP (12x12 mm) | 80-LQFP (12x12 mm) - same | 81-MAPBGA / 80-LQFP variants | 80-LQFP (12x12 mm) - same |
| Core Architecture | ColdFire V1 (32-bit) | ColdFire V1 (32-bit) | ColdFire V1 (32-bit, higher clock) | ColdFire V1 (32-bit) |
| Core Frequency (max) | 50.3 MHz | 50.3 MHz | 50.3 MHz | 50.3 MHz |
| Flash Memory | 128 KB | 256 KB (+100%) | 256 KB (+100%) | 128 KB (same) |
| USB | USB FS Device (integrated) | USB FS Device (integrated) | USB FS Device (integrated) | USB FS Device (integrated) |
| ADC | 16-bit Sigma-Delta differential | 16-bit Sigma-Delta differential | 12-bit SAR | 16-bit Sigma-Delta differential |
| Segment LCD Driver | Yes (graphical support) | Yes (graphical support) | No | Yes (graphical support) |
| Automotive Grade | No (industrial) | No (industrial) | No (industrial) | Yes (AEC-Q100) |
Key Differentiators
- Only 32-bit MCU with integrated USB + LCD + 16-bit Sigma-Delta in a single 80-LQFP (vs MCF51JE256CMB)
- Industrial-grade pricing vs automotive-grade derivative (vs MCF51AG128CLF)
- 128KB Flash in legacy ColdFire V1 footprint (vs MCF51MM256CLK)
Design Notes
The MCF51MM128CLK's Sigma-Delta ADC depends on a low-noise AVDD rail; add a 10uF + 0.1uF ceramic decoupling pair as close to pin 21/22 as possible, and route AVDD from VDD via a ferrite bead to isolate ADC switching noise. A dedicated ground pour for AVSS (pin 22) returns the ADC reference current without crossing noisy digital grounds, preserving the 16-bit noise floor at 4kHz conversion rate.
Although the MCF51MM128CLK is a low-power device, in USB-enabled handheld applications the internal voltage regulator dissipates ~250mW with all peripherals active (including segment LCD and Sigma-Delta ADC). Estimated: with theta_JA of about 60 C/W on a 4-layer 80-LQFP board, junction temperature rise is below 15C, keeping Tj within the 85C limit without a heatsink. Add thermal vias on the LQFP thermal pad to maintain margin at high ambient.
Route USB DP (pin 41) and DM (pin 42) as a 90-ohm differential pair to the USB connector, keeping the pair length-matched within 150 mils. Place the USB ESD protection diode adjacent to the connector side, not the MCU side, to ensure transient currents do not couple into the analog ground. Reference NXP application note AN4834 for USB PCB layout rules specific to ColdFire V1 devices.
Do not skip the BKGD pull-up resistor (typically 4.7k-10k to VDD) on pin 80, or single-wire debug will fail to connect via CodeWarrior. The segment LCD pins need the VLCD supply capacitor (typically 1uF ceramic) tied to the dedicated LCD charge pump pin; without it, the LCD display ghosts at low temperatures. For battery backup, the RTC domain must be supplied through the dedicated backup pin - sharing it with VDD defeats the RTC retention under main power loss.
When driving a multiplexed segment LCD, use maximum segment pin-to-pin trace length matching to within 1cm to avoid striping artifacts at multiplex ratios above 4:1. The ColdFire V1 LCD peripheral supports programmable bias and charge-pump frequency; tune the bias resistor to match the multiplex ratio for optimum contrast at -40C. Connecting unused LCD COM/SEG pins to VLC ground through a 100k resistor eliminates ghost segments in static or low-multiplex displays.
Compliance Information
RoHS-compliant per NXP product page and alldatasheet listing. Not AEC-Q100 qualified; choose MCF51AG128CLF for automotive. Lead-free and halogen-free per Surface Mount / SMD package marking.
