NXP Semiconductors MKM35Z512VLL7R

Overview

MKM35Z512VLL7R from NXP Semiconductors is a 32-bit Arm® Cortex®-M0+ microcontroller optimized for high-accuracy electricity metering, featuring 512 KB flash, 64 KB SRAM, four 24-bit ΣΔ ADCs with PGA, hardware tamper detection with timestamping, and an integrated segment LCD controller. It operates across –40 to 105 °C and supports single-chip 1-/2-/3-phase metering with WELMEC/OIML compliance.

For engineers reviewing the MKM35Z512VLL7R datasheet, MKM35Z512VLL7R pinout, MKM35Z512VLL7R application, or MKM35Z512VLL7R equivalent, this device delivers metrology-grade analog front-end performance, secure cryptographic acceleration (AES/MMCAU), low-power RTC with VBAT backup, and multi-mode power optimization down to 261 nA deep sleep current.

Technical Context

The MKM35Z512VLL7R integrates a dedicated Metering Memory Mapped Arithmetic Unit (MMAU) and four independent ΣΔ AFE channels with programmable gain amplifiers-enabling simultaneous high-resolution sampling of voltage and current inputs in polyphase energy measurement systems. Its iRTC includes hardware tamper detection with time stamping and battery-backed memory retention.

It features dual clock domains: a high-accuracy 32.768 kHz crystal oscillator in the VBAT domain for tamper-resilient timekeeping, and a configurable MCG with FLL/PLL supporting up to 75 MHz system clock. The device uses a 100-pin LQFP package with dedicated AFE pins (PTB7, PTE3, PTK4) and supports single-crystal implementation for reduced BOM count.

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 electricity metering applications.

Compared with MKM35Z512VLQ7R, the MKM35Z512VLL7R offers identical metrology IP and security but in a compact 100-pin package-reducing PCB area and assembly cost. Against MC56F84789VLL, it delivers certified metering capability out-of-box, eliminating external component validation effort and time-to-certification risk.

Availability

MKM35Z512VLL7R is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade gateway systems, and prepayment energy controllers requiring stable component supply across long product lifecycles and global utility deployments.

Supply support for MKM35Z512VLL7R 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The KM35 sub-family is designed specifically for metrology-grade electricity metering, integrating analog front-end precision, hardware security, and ultra-low-power operation to meet international standards including WELMEC 7.2 and IEC 62056.

FAQ

What is the maximum operating frequency of the MKM35Z512VLL7R core?

The MKM35Z512VLL7R features an Arm® Cortex®-M0+ core rated for up to 75 MHz operation under standard conditions (3.0 V, 25 °C). This frequency is sustained using the on-chip PLL with a 1–32 MHz external crystal or the internal 4 MHz reference clock. The core maintains full functionality-including MMAU and MMCAU acceleration-at this speed, enabling real-time harmonic analysis and tariff switching in multi-rate meters.

Does the MKM35Z512VLL7R support WELMEC and OIML compliance out of the box?

Yes, the MKM35Z512VLL7R is architected to support WELMEC 7.2 and OIML R46 compliance through integrated hardware features: four 24-bit ΣΔ ADCs with matched PGAs, factory-trimmed voltage reference (10–15 ppm/°C), hardware-based tamper detection with timestamping, and metrology-optimized DMA routing. While final certification requires system-level testing, the MKM35Z512VLL7R provides the foundational IP required for Class 0.2 accuracy and security validation.

How does the MKM35Z512VLL7R handle tamper detection and response?

The MKM35Z512VLL7R implements hardware tamper detection across multiple vectors: case-open switches (via dedicated TAMPERx pins), magnetic field sensors (using internal comparator thresholds), power supply glitches (via LVD monitoring), and clock fault injection. Events trigger immediate timestamping in VBAT-backed registers and can force entry into secure lockdown mode-disabling non-essential peripherals while preserving critical logs. All tamper responses execute autonomously without CPU intervention.

What LCD segment count does the MKM35Z512VLL7R support, and how is it powered in low-power modes?

The MKM35Z512VLL7R's integrated segment LCD controller supports up to 4×60 segments (or 8×56/6×58 configurations) and remains fully operational in all low-power modes-including VLPR (220 μA) and VLLS0 (261 nA). It uses internal charge pumps and bias generation, eliminating external components. Segment drive strength is software-configurable, and contrast is adjustable via internal voltage dividers referenced to VDD or VREFH.

Can the MKM35Z512VLL7R operate its AFE while in very-low-power run mode (VLPR)?

Yes, the MKM35Z512VLL7R supports AFE operation in VLPR mode at reduced performance: AFE modulator clock is limited to 1.6 MHz (vs. 6.5 MHz in normal run), enabling ~2.5 kSPS per channel at 24-bit resolution. This allows continuous current/voltage monitoring during sleep states-critical for detecting tamper events or load changes without waking the full CPU, while consuming less than 500 μA total system current.