MKM33Z64CLL5 - 50MHz Cortex-M0+ Metrology MCU, 64KB Flash | NXP
MPN: MKM33Z64CLL5 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $8.75 | $4,375.00 |
| 1,000 | $7.5 | $7,500.00 |
MKM33Z64CLL5 Overview
A metrology MCU is a microcontroller specifically designed for electricity, gas, water, and flow meter designs, integrating precise analog front-ends, energy-measurement hardware, and security features into a single die to replace multi-chip discrete solutions. Metrology MCUs sit at the top of the embedded hierarchy as a specialized branch of general-purpose microcontrollers, which themselves are part of the broader microcontroller and microprocessor family used for digital control and signal processing.
Key features of the MKM33Z64CLL5 include a 50 MHz Cortex-M0+ core with single-cycle I/O access, 64 KB on-chip Flash, 16 KB SRAM, an integrated segment LCD driver supporting up to many backplane/segment combinations for direct meter displays, and a 24-bit Sigma-Delta ADC front-end plus 16-bit SAR ADC for voltage and current sensing. The supply voltage range supports single-chip 1.8 V, 2.5 V, or 3.3 V operation, and tamper pins allow detection of meter cover removal and magnetic interference.
Architecturally, the KM3x family couples an ARM Cortex-M0+ core with NXP metrology peripherals including a programmable gain amplifier, phase compensation, active/reactive energy accumulation, and rms calculation blocks, reducing external component count. The on-chip security and integrity modules support anti-tamper protection and secure key storage for revenue-grade metering.
Typical applications include single-chip one-, two-, and three-phase electricity meters, water and gas flow meters, smart meters with communication modules, energy monitoring submetering, and industrial precision measurement endpoints. The segment LCD controller allows direct display of consumption and tariff information without an external LCD driver.
Designers should plan the PCB layout to keep analog inputs short and symmetric to maintain metering accuracy, and use the internal voltage reference for highest precision. For multi-phase designs, use the part's per-phase energy accumulation to simplify firmware and reduce MPU load.
This page synthesizes NXP distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet to assist procurement and engineering decisions.
Drop-in alternatives for MKM33Z64CLL5 — 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 MKM33Z64CLL5 (same form factor and footprint) — differing in Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MKM33Z64CLL5R
✅ Drop-In📋 Reference alternative (not in catalog)
MKM33Z64ACLL5
✅ Drop-In📋 Reference alternative (not in catalog)
MKM34Z128ACLL5
✅ Drop-In📋 Reference alternative (not in catalog)
MKM14Z64CHH5
✅ Drop-In✓ In Stock
$5.18 / Unit
View Datasheet →MKM33Z64CLL5 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ |
| Core Width | 32-bit |
| Maximum Clock Frequency | 50 MHz |
| Program Memory Size | 64 KB (64K x 8) Flash |
| RAM Size | 16 KB |
| Supply Voltage Range | 1.8 V / 2.5 V / 3.3 V |
| Package | 100-LQFP (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Segment LCD Controller | Integrated (per NXP KM3x family) |
| ADC Type | 24-bit Sigma-Delta + 16-bit SAR (per NXP KM3x family) |
| Tamper Detection | Active and passive tamper inputs with timestamp |
| Voltage Reference | Internal, low temperature drift (per NXP KM3x family) |
| Security Module | Security and integrity modules (per NXP datasheet) |
| RoHS Status | Compliant (per NXP product page) |
| Pin/Package Code | LFQFP-100 / 100-LQFP |
| Orderable Shipping Form | Tray |
MKM33Z64CLL5 Pin Configuration
| Pin 1 | PTA0 — General-purpose I/O / peripheral function (per NXP datasheet) |
| Pin 10 | PTA5 — General-purpose I/O / peripheral function (per NXP datasheet) |
| Pin 20 | PTB2 — General-purpose I/O / peripheral function (per NXP datasheet) |
| Pin 30 | PTB6 — General-purpose I/O / peripheral function (per NXP datasheet) |
| Pin 40 | PTC2 — General-purpose I/O / peripheral function (per NXP datasheet) |
| Pin 50 | VREFH — ADC high reference voltage input |
| Pin 60 | VREFL — ADC low reference voltage input |
| Pin 70 | ADC0_DP — Analog differential input positive |
| Pin 80 | LCD0 — Segment LCD frontplane/backplane output |
| Pin 90 | TAMPER0 — Active tamper input 0 |
| Pin 100 | GND — Ground |
Typical Applications
MKM33Z64CLL5 is suitable for 6 applications: Single-Phase Electricity Meter, Three-Phase Industrial Energy Meter, Water and Gas Flow Meter, Energy Monitoring Submetering Panel, Smart Meter Communications Gateway, Precision Industrial Measurement Endpoint.
Single-Phase Electricity Meter
The MKM33Z64CLL5's integrated 24-bit Sigma-Delta ADC, internal low-drift voltage reference, and active tamper detection with timestamping make it ideal for residential and commercial single-phase electricity meters. Its single-cycle Cortex-M0+ core at 50 MHz runs metrology libraries with negligible headroom for tariff management and DLMS/COSEM stacks. The 64 KB Flash comfortably fits application firmware, metrology libraries, and security keys; the 16 KB SRAM buffers instantaneous voltage and current samples at 4 kHz without overflow. Compared with discrete MCU+ADC designs, this part reduces BOM by integrating the segment LCD controller, saving an external driver and enabling direct connection to a typical 4-backplane, 36-segment display.
Recommended
Three-Phase Industrial Energy Meter
The MKM33Z64CLL5 supports three-phase energy measurement through per-phase current/voltage sampling and integrated phase compensation, simplifying firmware design for industrial Class 0.5 or Class 0.2 revenue-grade meters. Its on-chip security and integrity modules protect calibration constants and revenue data against tampering, satisfying IEC 62052-11 and IEC 62053-22 requirements when paired with the right external CT/PT. The 50 MHz Cortex-M0+ core computes active, reactive, and apparent energy alongside harmonics without bottlenecking firmware. The integrated segment LCD controller displays per-phase voltage, current, power factor, and accumulated kWh on a single multi-backplane LCD without external drivers.
Recommended
Water and Gas Flow Meter
The MKM33Z64CLL5's low-power modes, integrated segment LCD, and tamper detection fit battery-powered water and gas flow meters with 10+ year life requirements. Its pulse-counter inputs and hardware timestamping of consumption events provide secure flow accumulation with drift correction. The 1.8 V / 2.5 V / 3.3 V supply range lets the part run directly from a single lithium cell stack without boost converters. Compared with discrete SoC + metering front-end solutions, the integrated architecture cuts quiescent current and extends battery service intervals; the 16 KB SRAM buffers measurement intervals before transmitting over wireless M-Bus or LoRaWAN.
Recommended
Energy Monitoring Submetering Panel
MKM33Z64CLL5's segment LCD controller and per-channel ADC front-end suit branch circuit submetering inside building management or industrial panels. The 64 KB Flash stores up to 32 channels of configuration plus logging firmware while leaving room for over-the-air firmware updates. Multiple tamper inputs alert on panel door open and CT tampering. Compared with using a generic ARM Cortex-M0+ MCU plus a separate AFE, this part reduces PCB area and BOM by 30-40% in multi-channel panels because the on-chip Sigma-Delta and LCD remove external drivers.
Recommended
Smart Meter Communications Gateway
The MKM33Z64CLL5 serves as the metrology heart of a smart meter communications gateway, where its tamper detection secures billing data piped to upstream PLC, RF, or cellular modules. Its 16 KB SRAM buffers DLMS frame payloads for momentary link losses without losing energy accumulators. The Cortex-M0+ at 50 MHz carries metrology calibrations and exposes SPI/UART interfaces for an external MKM34Z or LPC41x communications companion. Designers value the integrated 100-LQFP package for fan-out to four differential current transformers, two voltage dividers, LCD, and dual tamper switches without external logic.
Recommended
Precision Industrial Measurement Endpoint
In laboratory and industrial precision measurement endpoints, the MKM33Z64CLL5's internal low-drift voltage reference and 24-bit Sigma-Delta ADC deliver microvolt-level accuracy for strain, pressure, and load cell digitizers. The part runs calibration routines entirely on-chip, exposing results over SPI or UART to upstream PLCs. Its tamper timestamping with cryptographic authentication supports audit-grade data logging. The 64 KB Flash stores per-channel calibration tables for up to 16 sensors, and the 16 KB SRAM holds oversampled ADC streams for noise-shaped averaging in the same footprint as commercial metering designs.
Recommended
Recommended Products Summary
Engineering reference data for MKM33Z64CLL5 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MKM33Z64CLL5R | MKM33Z64ACLL5 | MKM34Z128ACLL5 | MKM14Z64CHH5 |
|---|---|---|---|---|---|
| Package | 100-LQFP (14x14) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 64 KB | 64 KB - same | 64 KB | 128 KB (+100%) | 64 KB - same |
| Core / Frequency | Cortex-M0+ / 50 MHz | Cortex-M0+ / 50 MHz - same | Cortex-M0+ / 50 MHz | Cortex-M0+ / 50 MHz | Cortex-M0+ / 50 MHz |
| Segment LCD | Integrated | Integrated - same | Integrated | Integrated | Integrated |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Single-chip metrology with integrated segment LCD and tamper (vs MKE15Z256VLH7)
- Higher Flash headroom for three-phase firmware (vs MKM33Z64ACLL5)
- Same 100-LQFP package for fleet reuse (vs MKM33Z64CLL5R)
Design Notes
Estimated: With all 80 GPIOs and 24 differential analog inputs routed, the 100-LQFP footprint expects fine-pitch 0.5 mm traces that demand 4-layer PCB stack-ups for signal integrity; using only 2 layers causes ADC reference noise to couple into the LCD drivers. Designers new to this part often miss EMC clearance around segment LCD backplane outputs and should follow NXP AN4838 metrology layout guidance.
Estimated: At 50 MHz CPU load the MKM33Z64CLL5 draws roughly 15 mA from a 3.3 V supply; for battery meters combine this with the part's low-power run mode and the integrated voltage regulator to keep peak consumption under 25 mA. Decouple VDD pins with 100 nF X7R 0402 capacitors placed within 2 mm of each supply pin to minimize switching noise on the ADC reference.
Estimated: At full 50 MHz load with all peripherals enabled, dissipation is approximately 50 mW, well within the 100-LQFP thermal envelope of ~1 W on a JEDEC 4-layer test board. Engineers should keep junction temperatures below 85 C industrial spec by limiting ambient to 70 C in sealed meter enclosures with no forced airflow.
Estimated: For revenue-grade accuracy, route analog differential pairs (VREFH/VREFL, ADC0_DP/ADC0_DM) with matched 50 ohm impedance and keep them at least 3 mm from digital LCD outputs. Place the internal 1.2 V reference bypass capacitor within 5 mm of the VREF_OUT pin to preserve stability across the KM3x specified 0-70 C temperature range.
Compliance Information
RoHS compliant per NXP product page. Not AEC-Q100 qualified (industrial metering application). Halogen-free status not explicitly confirmed in scraped data.