NXP Semiconductors MKM33Z128ACLH5

Overview

MKM33Z128ACLH5 from NXP Semiconductors (formerly Freescale) is a 50 MHz ARM Cortex-M0+ microcontroller optimized for smart metering and LCD-based industrial instrumentation. It integrates 128 KB flash, 16 KB RAM, dual 24-bit sigma-delta AFEs with PGA (up to 32× gain), 16-bit SAR ADC, segment LCD controller (36×8 or 40×4), and dual UARTs with ISO7816 support - enabling single-chip implementation of utility-grade energy meters with real-time display and secure communication.

For engineers reviewing the MKM33Z128ACLH5 datasheet, MKM33Z128ACLH5 pinout, MKM33Z128ACLH5 application, or MKM33Z128ACLH5 equivalent, key selection considerations include its dual AFE architecture for simultaneous voltage/current measurement, low-power stop modes down to 0.35 µA (VLLS0, POR disabled), 32 kHz RTC with battery backup, and LQFP-64 package compatibility with metering reference designs.

Technical Context

The MKM33Z128ACLH5 implements a dual-sigma-delta analog front end with two independent 24-bit modulators, each paired with a programmable gain amplifier supporting gains up to 32×, enabling high-resolution current and voltage sensing in polyphase metering. Its clock system includes a 1–32 MHz crystal oscillator, 32 kHz RTC oscillator, and multi-purpose clock generator supporting dynamic frequency scaling across run, VLPR, and multiple stop modes.

System-level integration includes a Peripheral Crossbar for flexible signal routing, 4-channel DMA with 64 request sources, memory protection unit with multi-master arbitration, and hardware CRC and true random-number generator for firmware integrity and secure boot. The device supports ISO7816-compliant UARTs for smart card interfaces and IrDA operation on one SCI channel.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MKL27Z128VLH7 and MKE15Z128VLH7, the MKM33Z128ACLH5 uniquely integrates dual AFEs with PGA, segment LCD controller, and ISO7816 UARTs - eliminating 4–6 external components in Class 0.5S electricity meters while maintaining sub-µA stop-mode operation.

Availability

MKM33Z128ACLH5 is available at Aetrix Electronics and suitable for smart metering, industrial panel instrumentation, and battery-powered utility monitoring requiring stable component supply, long-lifecycle support, and metrology-grade analog performance.

Supply support for MKM33Z128ACLH5 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MKM33Z128ACLH5 belongs to NXP's Kinetis KM family - designed specifically for high-accuracy, low-power smart metering and industrial human-machine interface applications with integrated analog front ends and LCD controllers.

FAQ

What is the maximum operating frequency of the MKM33Z128ACLH5 core?

The MKM33Z128ACLH5 features an ARM Cortex-M0+ core rated for up to 50 MHz operation. This frequency is supported across the full operating voltage range of 2.7–3.6 V (when AFE is active) and 1.71–3.6 V (when AFE is inactive), delivering 0.95 Dhrystone MIPS per MHz for deterministic real-time metrology processing. The MKM33Z128ACLH5 achieves this performance using its multi-purpose clock generator and internal PLL.

Does the MKM33Z128ACLH5 support battery-backed real-time clock operation?

Yes, the MKM33Z128ACLH5 supports full RTC functionality with battery backup via its dedicated VBAT pin. When main VDD is removed, the iRTC remains powered by an external 1.71–3.6 V battery source, retaining calendar, alarm, and tamper event timestamps. The MKM33Z128ACLH5 specifies VBAT current consumption as low as 0.3 µA (with RTC and 32 kHz oscillator disabled) and 1.3 µA (with RTC active), enabling multi-year operation on a single CR2032 cell.

How many analog-to-digital converter channels does the MKM33Z128ACLH5 integrate?

The MKM33Z128ACLH5 integrates two distinct ADC subsystems: a 16-bit successive approximation register (SAR) ADC for general-purpose sensing, and a dual-channel 24-bit sigma-delta analog front end (AFE) comprising two independent 24-bit modulators with integrated programmable gain amplifiers (PGA). This architecture allows simultaneous high-resolution current and voltage sampling - a requirement for IEC 62053-21 Class 0.5S metering - without external signal conditioning.

What LCD configurations does the MKM33Z128ACLH5 segment controller support?

The MKM33Z128ACLH5 segment LCD controller supports two configurations: 36 frontplane × 8 backplane or 40 frontplane × 4 backplane. This flexibility accommodates common utility meter glass layouts, including 4-digit numeric displays with status symbols (e.g., kWh, kVARh, tamper flags). All segment and backplane outputs are driven directly from the MKM33Z128ACLH5's GPIO pins under hardware control, eliminating need for external LCD driver ICs.

Which communication interfaces on the MKM33Z128ACLH5 support ISO7816 standards?

The MKM33Z128ACLH5 includes two UART modules that support ISO7816-3 physical layer and protocol timing for smart card interfaces. These UARTs are designated as SCI0 and SCI1 in the KM Family reference manual and can operate at standard ISO7816 bit rates (e.g., 9600, 38400 baud) with automatic guard time and character timing control. This capability enables direct integration of secure element communication in DLMS/COSEM-compliant meters - a key feature distinguishing the MKM33Z128ACLH5 from general-purpose MCUs.