NXP Semiconductors MKM33Z64ACLH5

Overview

MKM33Z64ACLH5 from NXP Semiconductors (formerly Freescale) is a 50 MHz ARM Cortex-M0+ microcontroller optimized for smart metering and LCD-based industrial sensing applications. It integrates a 64 KB flash memory, 16 KB RAM, 16-bit SAR ADC, 24-bit sigma-delta AFE with PGA (gain up to 32), dual analog comparators with 6-bit DACs, and a segment LCD controller supporting up to 36×8 or 40×4 configurations. It operates across –40°C to +85°C at 1.71–3.6 V (AFE disabled) or 2.7–3.6 V (AFE enabled).

For engineers reviewing the MKM33Z64ACLH5 datasheet, MKM33Z64ACLH5 pinout, MKM33Z64ACLH5 application, or MKM33Z64ACLH5 equivalent, key selection considerations include its integrated AFE for precision metrology, low-power stop modes down to 0.35 µA (VLLS0, POR disabled), LCD driver capability, and dual SPI/I²C/UART interfaces with ISO7816 support - critical for utility meter design, portable instrumentation, and battery-powered HMI systems.

Technical Context

The MKM33Z64ACLH5 implements a single-core ARM Cortex-M0+ executing at up to 50 MHz with 0.95 Dhrystone MIPS/MHz, paired with a multi-purpose clock generator supporting 1–32 MHz crystal and 32 kHz RTC oscillators. Its system architecture includes a 4-channel DMA controller, memory protection unit (MPU), robust watchdog, and peripheral crossbar for flexible signal routing between on-chip modules.

Analog subsystem integration includes a 24-bit sigma-delta AFE comprising two SD ADCs with PGA and one additional SD ADC, a 16-bit SAR ADC, two analog comparators each with embedded 6-bit DAC and programmable reference input, and a 1.2 V internal voltage reference. The device supports four low-power modes (VLPR, VLPS, STOP, VLLSx) with sub-µA retention in VLLS0 and dedicated iRTC battery supply (1.71–3.6 V).

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, PP = LH per part number decoding). Pin assignments follow KM Family Pinout specification Rev. 1 (2014), with multiplexed signals including ADC inputs, LCD segments/backplanes, UART/I²C/SPI peripherals, and AFE-specific pins (e.g., AFE_VREFH/L, AFE_INx, AFE_PGA_OUT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MKL27Z64VLH4 and MKE15Z64VLD4, the MKM33Z64ACLH5 uniquely combines metrology-class AFE, segment LCD control, and ultra-low-power stop modes - making it the only drop-in solution for Class 0.2 electricity meters without external analog or display components.

Availability

MKM33Z64ACLH5 is available at Aetrix Electronics and suitable for smart metering, portable instrumentation, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and verified metrology performance.

Supply support for MKM33Z64ACLH5 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 markets, with deep expertise in microcontrollers and analog signal processing.

The MKM33Z64ACLH5 belongs to NXP's Kinetis KM series - a product line engineered specifically for smart utility metering, featuring integrated AFE, LCD controllers, and ultra-low-power operation to meet IEC 62053 and ANSI C12 standards.

FAQ

What is the maximum operating frequency of the MKM33Z64ACLH5?

The MKM33Z64ACLH5 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 (with AFE disabled) or 2.7–3.6 V (with AFE enabled). System and bus clocks derive from this core clock via configurable dividers, with flash clock limited to 25 MHz in normal run mode.

Does the MKM33Z64ACLH5 include hardware support for cryptographic operations?

The MKM33Z64ACLH5 does not integrate dedicated cryptographic accelerators (e.g., AES, SHA, RSA). However, it includes a hardware CRC module for fast cyclic redundancy checks and a true random-number generator (TRNG) compliant with NIST SP 800-90B - both used in firmware integrity verification and secure key derivation for DLMS/COSEM implementations.

What LCD configuration does the MKM33Z64ACLH5 support?

The MKM33Z64ACLH5 supports two segment LCD configurations: 36 frontplanes × 8 backplanes (288 segments) or 40 frontplanes × 4 backplanes (160 segments). It provides internal bias generation, charge pump, and static/dynamic drive modes - eliminating need for external LCD bias ICs in smart meter displays.

Can the MKM33Z64ACLH5 operate from a coin-cell battery in RTC-only mode?

Yes. The MKM33Z64ACLH5 supports iRTC operation with VBAT supply from 1.71 V to 3.6 V. In VLLS3 mode with RTC and 32 kHz oscillator active, typical current draw is 1.98 µA at 25°C and 3.0 V - enabling >10-year operation from a CR2032 coin cell when paired with low-leakage external circuitry.

What is the purpose of the AFE_VREFH and AFE_VREFL pins on the MKM33Z64ACLH5?

AFE_VREFH and AFE_VREFL define the high and low reference voltages for the 24-bit sigma-delta AFE. These pins accept external precision references (e.g., 2.5 V differential) or connect to internal 1.2 V reference. They set the full-scale input range for SD ADC conversions - critical for achieving <0.1% gain error in revenue-grade metering applications.