NXP Semiconductors MKM33Z64CLH5

Overview

MKM33Z64CLH5 from NXP Semiconductors (formerly Freescale) is a 50 MHz ARM Cortex-M0+ microcontroller optimized for smart metering with integrated analog front end (AFE), segment LCD controller, and low-power operation. It features 64 KB flash, 16 KB RAM, 16-bit SAR ADC, 24-bit sigma-delta AFE with PGA (up to 32× gain), dual comparators with 6-bit DACs, and operates from 1.71–3.6 V (AFE off) or 2.7–3.6 V (AFE on) across –40°C to +85°C ambient.

For engineers reviewing the MKM33Z64CLH5 datasheet, MKM33Z64CLH5 pinout, MKM33Z64CLH5 application, or MKM33Z64CLH5 equivalent, key selection criteria include AFE channel count, LCD backplane support (8), RTC battery retention voltage range (1.71–3.6 V), VLPS/VLLS power modes, and 64-pin LQFP package compatibility with metering PCB layouts.

Technical Context

The MKM33Z64CLH5 implements a dual-domain clock architecture with independent 1–32 MHz crystal oscillator and 32 kHz RTC oscillator, enabling simultaneous high-speed processing and ultra-low-power timekeeping. Its AFE subsystem integrates two 24-bit sigma-delta ADCs with programmable gain amplifiers and digital averaging, supporting metrology-grade current/voltage sensing in single-phase electricity meters.

System-level power management includes five low-power modes (VLPR, VLPS, VLLS0–3) with sub-μA stop-mode currents (e.g., 0.35 μA in VLLS0 with POR disabled), memory protection unit (MPU), 4-channel DMA, and peripheral crossbar for flexible signal routing-critical for deterministic real-time metering firmware execution.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm), lead-free, moisture sensitivity level 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metering microcontroller applications.

Compared with MKM33Z64CLH5, MKM33Z128CLH5 offers double flash capacity in identical packaging for seamless firmware scalability, while MKE15Z64VLD4 trades integrated metrology for CAN FD connectivity and requires redesign of analog signal chain and PCB layout.

Availability

MKM33Z64CLH5 is available at Aetrix Electronics and suitable for smart metering, utility infrastructure monitoring, and industrial energy management systems requiring stable component supply, long-term lifecycle assurance, and metrology-grade analog integration.

Supply support for MKM33Z64CLH5 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 applications, with deep expertise in microcontrollers and analog signal processing.

The MKM33Z64CLH5 belongs to NXP's Kinetis KM series, designed specifically for smart metering applications requiring high-precision analog measurement, ultra-low-power operation, and integrated human-machine interface capabilities.

FAQ

What is the maximum operating frequency of the MKM33Z64CLH5 core?

The MKM33Z64CLH5 features an ARM Cortex-M0+ core rated for up to 50 MHz operation. This frequency is supported across the full –40°C to +85°C temperature range and 1.71–3.6 V supply voltage (when AFE is inactive). At 50 MHz, the core delivers 0.95 Dhrystone MIPS per MHz, enabling efficient execution of metrology algorithms and communication protocols in the MKM33Z64CLH5.

Does the MKM33Z64CLH5 support both 16-bit SAR and 24-bit sigma-delta ADCs simultaneously?

Yes, the MKM33Z64CLH5 integrates two independent analog subsystems: a 16-bit SAR ADC with up to 16 single-ended inputs and a dedicated 24-bit sigma-delta AFE with two channels, each including PGA and digital averaging. Both can operate concurrently-the SAR ADC handles auxiliary sensors (e.g., temperature), while the AFE performs high-accuracy current/voltage metrology in the MKM33Z64CLH5.

What LCD configuration does the MKM33Z64CLH5 support?

The MKM33Z64CLH5's integrated segment LCD controller supports two configurations: 36 frontplanes × 8 backplanes or 40 frontplanes × 4 backplanes. This enables direct drive of standard 8-digit numeric displays common in electricity meters without external driver ICs. All LCD pins are multiplexed with GPIO functionality, allowing flexible use in the MKM33Z64CLH5 design.

What is the minimum supply voltage for RTC operation with VBAT in the MKM33Z64CLH5?

The MKM33Z64CLH5 supports RTC operation with VBAT supply down to 1.71 V, as specified in its operating characteristics. This allows use of standard CR2032 lithium coin cells (nominal 3.0 V, endpoint ~2.0 V) to retain calendar, alarms, and tamper registers for over 10 years. The iRTC battery supply voltage range is explicitly 1.71–3.6 V for the MKM33Z64CLH5.

How many low-power modes does the MKM33Z64CLH5 offer, and what is the lowest current draw?

The MKM33Z64CLH5 provides five configurable low-power modes: VLPR, VLPS, and VLLS0–VLLS3. The lowest current draw is achieved in VLLS0 mode with POR detect circuit disabled: ≤0.35 μA at 25°C and 3.0 V. This enables decade-long battery backup for RTC and tamper logging, a critical requirement for utility-grade metering applications using the MKM33Z64CLH5.