NXP Semiconductors MKM33Z128CLL5

Overview

MKM33Z128CLL5 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 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 operates from 1.71–3.6 V across –40°C to +85°C.

For engineers reviewing the MKM33Z128CLL5 datasheet, MKM33Z128CLL5 pinout, MKM33Z128CLL5 application, or MKM33Z128CLL5 equivalent, key selection considerations include AFE channel count, LCD backplane support, low-power stop modes down to 0.35 μA, and dual SPI/I²C/UART interfaces with ISO7816 and IrDA capability.

Technical Context

The MKM33Z128CLL5 implements a dual-channel 24-bit Sigma-Delta AFE architecture with programmable gain amplifiers and integrated 6-bit DACs in its analog comparators, enabling high-precision metrology-grade current/voltage measurement. Its clock system includes independent 1–32 MHz and 32 kHz crystal oscillators plus a multi-purpose clock generator supporting dynamic frequency scaling between 2 MHz (VLPR) and 50 MHz (RUN).

System-level power management leverages five low-power modes-including VLLS0 (0.35 μA at 25°C with POR disabled) and VLLS3 (1.98 μA)-controlled by a robust watchdog, memory protection unit, and peripheral crossbar that routes internal signals without software intervention. The device supports hardware CRC, true random number generation, and 128-bit unique chip ID for secure firmware updates.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 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 MKM33Z128CLL5, MKM33Z64CLL5 reduces flash capacity but maintains identical analog precision and LCD capability-ideal for cost-sensitive single-phase meters. MKM34Z128CLL5 extends metrology capability with a third SD-ADC channel while preserving full software compatibility and footprint.

Availability

MKM33Z128CLL5 is available at Aetrix Electronics and suitable for smart metering, industrial panel meters, and battery-powered utility monitoring systems requiring stable component supply over extended product lifecycles.

Supply support for MKM33Z128CLL5 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 markets.

The KM Family, including MKM33Z128CLL5, was designed specifically for high-accuracy metrology and LCD-based utility metering applications, integrating precision analog front ends, ultra-low-power operation, and secure firmware execution capabilities.

FAQ

What is the maximum operating frequency of the MKM33Z128CLL5 core?

The MKM33Z128CLL5 features an ARM Cortex-M0+ core rated for up to 50 MHz operation. This frequency is achievable under specified conditions: VDD = 2.7–3.6 V, ambient temperature –40°C to +85°C, and proper clock configuration using the MCG module. At 50 MHz, the core delivers 0.95 Dhrystone MIPS per MHz, enabling real-time metrology computations in smart meter firmware.

Does the MKM33Z128CLL5 support both 32 kHz and high-frequency crystals simultaneously?

Yes, the MKM33Z128CLL5 supports concurrent use of a 32 kHz crystal for the independent RTC module and a 1–32 MHz crystal for the main system clock. These are physically separate oscillator circuits (RTC_EXTAL/RTC_XTAL and EXTAL/XTAL pins), allowing calendar timekeeping to continue uninterrupted during deep-sleep modes while the main system clock is gated.

What LCD configurations does the MKM33Z128CLL5 segment controller support?

The MKM33Z128CLL5 segment LCD controller supports two configurations: 36 frontplane lines × 8 backplane lines or 40 frontplane lines × 4 backplane lines. This flexibility accommodates common utility meter displays (e.g., 4-digit numeric + status icons) and allows direct drive without external LCD drivers, reducing system cost and complexity.

How does the MKM33Z128CLL5 achieve ultra-low power consumption in stop mode?

The MKM33Z128CLL5 achieves ultra-low power in VLLS0 mode (0.35 μA at 25°C) by disabling the POR detect circuit, retaining only the RTC, tamper logic, and wakeup units on the VBAT-supplied domain. This configuration is validated per datasheet Table 6 and enables decade-long battery operation in backup-powered metering applications.

Can the MKM33Z128CLL5's AFE operate with a 1.8 V supply?

No. The MKM33Z128CLL5's Analog Front End requires VDDA between 2.7 V and 3.6 V when active, as specified in Section 5.2.1 of the KM Family Data Sheet Rev. 7. Operating the AFE below 2.7 V violates the operating requirement and may result in incorrect conversion results or undefined behavior. The 1.71–3.6 V range applies only when AFE is disabled.