NXP Semiconductors MKM34Z128CLL5

Overview

MKM34Z128CLL5 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 ultra-low-power operation. It features 128 KB flash, 16 KB RAM, dual 24-bit sigma-delta ADCs, programmable gain amplifier (up to 32×), and operates from 1.71–3.6 V (or 2.7–3.6 V when AFE is active) across –40°C to +85°C ambient.

For engineers reviewing the MKM34Z128CLL5 datasheet, MKM34Z128CLL5 pinout, MKM34Z128CLL5 application, or MKM34Z128CLL5 equivalent, key selection considerations include AFE channel count (2 SD-ADCs), LCD drive capability (36×8 or 40×4), RTC battery backup support, low-leakage stop modes (down to 0.35 µA), and dual SPI/I²C/UART interfaces with ISO7816 and IrDA options.

Technical Context

The MKM34Z128CLL5 implements a dual-channel 24-bit sigma-delta AFE with independent PGA paths per channel, enabling simultaneous high-precision metrology measurements (e.g., voltage and current) without external multiplexing. Its MCG clock system supports multiple oscillator sources including 1–32 MHz crystal, 32 kHz RTC crystal, and internal reference, with configurable PLL and low-power modes.

It integrates a 4-channel Quad Timer for precise timekeeping and event capture, an independent RTC with calendaring and compensation, and a Peripheral Crossbar enabling flexible signal routing between modules-critical for deterministic timing in metering firmware. Memory protection unit (MPU) and hardware CRC ensure secure, robust operation in field-deployed utility infrastructure.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, PP = LL per part number decoding). Pin assignments follow KM Family Pinout Table 8.2 (Rev. 7, p.48), with dedicated AFE input pairs (e.g., AD0P/AD0N, AD1P/AD1N), LCD segment/backplane drivers (LCD[0:35]/LCD[0:7] or LCD[0:39]/LCD[0:3]), and dual UART/I²C/SPI peripherals mapped across port groups.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MKM33Z128CLL5, MKM34Z128CLL5 adds a second SD-ADC channel and PGA path - essential for Class 0.2 electricity meters. Versus MKE15Z128VLH7, it eliminates two external ICs (AFE + LCD driver), reducing PCB area by ≥35% and qualification effort for utility certification.

Availability

MKM34Z128CLL5 is available at Aetrix Electronics and suitable for smart metering, industrial power monitoring, and battery-backed utility endpoint applications requiring stable component supply, long-term lifecycle assurance, and full documentation traceability.

Supply support for MKM34Z128CLL5 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, with deep expertise in embedded processing and analog integration.

The KM family - including MKM34Z128CLL5 - was designed specifically for utility metering applications, integrating high-precision AFE, LCD control, and ultra-low-power operation into a single chip to meet IEC 62053 and ANSI C12 standards.

FAQ

What is the maximum operating frequency of the MKM34Z128CLL5 core?

The MKM34Z128CLL5 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 ambient temperature range and 1.71–3.6 V supply voltage (when AFE is inactive) or 2.7–3.6 V (when AFE is active). The MKM34Z128CLL5 achieves 0.95 Dhrystone MIPS per MHz, delivering deterministic real-time performance for metrology algorithms.

Does the MKM34Z128CLL5 support battery-backed RTC operation?

Yes, the MKM34Z128CLL5 supports independent RTC operation via the VBAT pin, which accepts 1.71–3.6 V battery input. The iRTC module retains calendar, alarm, and compensation registers during main power loss. The MKM34Z128CLL5 draws only 0.3 µA average current (at 25°C) with RTC and 32 kHz oscillator active and VDD off, enabling multi-year operation on a CR2032 coin cell.

How many analog input channels does the MKM34Z128CLL5 AFE provide?

The MKM34Z128CLL5 integrates a dual-channel 24-bit sigma-delta AFE, providing two fully independent differential input paths (AD0P/AD0N and AD1P/AD1N), each with its own programmable gain amplifier (PGA) supporting gains up to 32×. This allows simultaneous high-accuracy sampling of voltage and current signals - a key requirement for Class 0.2 electricity meters - without external multiplexing or signal conditioning.

What LCD configurations does the MKM34Z128CLL5 support?

The MKM34Z128CLL5's integrated segment LCD controller supports two configurations: 36 frontplane × 8 backplane (288 segments) or 40 frontplane × 4 backplane (160 segments). It includes software-selectable bias, frame frequency, and charge pump control. The MKM34Z128CLL5 drives these directly from GPIO pins mapped to LCD[0:35]/LCD[0:7] or LCD[0:39]/LCD[0:3], eliminating need for external display controllers.

What low-power modes are available on the MKM34Z128CLL5?

The MKM34Z128CLL5 offers six low-power modes: RUN, WAIT, VLPR, VLPS, STOP, and four VLLS sub-modes (VLLS0–VLLS3). VLLS0 achieves the lowest leakage at 0.35 µA (POR disabled) or 0.47 µA (POR enabled), making it ideal for battery-backed RTC and tamper monitoring. All modes retain RAM content and support wake-up via GPIO, RTC alarm, or AFE conversion complete events - critical for responsive smart meter operation.