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NXP Semiconductors KM35 MCU Family

KM3x MCU Family enables high accuracy, secure 1-, 2- & 3-phase electricity metering solutions through a powerful analog front end (AFE)

KM3x MCU Family enables high accuracy, secure 1-, 2- & 3-phase electricity metering solutions through a powerful analog front end (AFE), by integrating auto-compensated iRTC with HW tamper detection, segment LCD controller, rich security protection and low power features.

The KM3x MCU family includes three subfamilies: KM33, KM34, and KM35; the key differences being the 24-bit sigma-delta model number to address the metering requirement for different regions.

Based on 75MHz Arm® Cortex®-M0+ core, KM35 MCUs offer up to 512 KB flash, 64 KB SRAM, and additional integrated peripherals.

Key features

Analog Front End
Security & HMI
Rich Enablement
Enabling single-chip 1,2 & 3-phase meter designs

Additional features

Analog Front End

High accuracy AFE with 4 x 24-bit Sigma-Delta ADCs for simultaneous voltage and current measurement.
16-channel, 16-bit SAR ADC inputs for accurate measurement of phase voltage in 3-phase applications

Security & HMI

Cortex®-M0+ core, memory protection unit, cross-bar peripheral bridge, GPIO, and DMA enable compliance with WELMEC & OIML standards
Active and passive tamper pins with automatic time stamping to protect against external intrusion
HW encryptions (MMCAU – DES, 3DES, AES, MD5, SHA-1/SHA-256)CRC (16/32 bits) for data integrity

Rich Enablement

Comprehensive peripheral library drivers included in the MCUXpresso ecosystem
Filter and FFT based metrology firmware provided free-of-charge
TWR-KM35Z75M NXP Tower System Module compatible with multiple peripheral modules from NXP and third parties
Certified 1,2 & 3-ph reference designs + metrology firmware
Product Longevity Program (15 years)

Enabling single-chip 1,2 & 3-phase meter designs

AFE, Security & HMI. Single crystal implementation
Single point of calibration during manufacture

Reaching new levels of memory density and integration

Up to 512 KB Flash Memory and 64 KB SRAM
Memory Mapped Cryptographic Acceleration Unit (MMCAU) for AES encryption

Applications

Electricity Meters
Flow Meters (e.g., Heat, Water, Gas)
Industrial Measurement and Sensing

Available tools

TWR-KM35Z75M Tower System Module

The TWR-KM35Z75M board is designed to work either in standalone mode or as part of the NXP Tower System, a modular development board platform that enables rapid prototyping and tool re-use through reconfigurable hardware. Begin constructing your Tower System evaluation board platform today by visiting www.nxp.com/Tower for additional Tower System boards and compatible peripherals.

Tower-compatible microcontroller module
KM35Z512VLQ7 MCU (75 MHz, 512 KB Flash, 64 KB RAM, low power, LQFP144 package)
USB interface with micro-B USB connector
Large 160-segment glass LCD
On-board debug circuit: Open source SWD (OpenSDA) with virtual serial port
Three-axis accelerometer/anti-tamper tilt sensor (MMA8451Q)
Three user-controllable LEDs
Two user push-button switches for GPIO interrupts
One user push-button switch for tamper detection
One user push-button switch for MCU reset
Potentiometer
Headers for direct GPIO and ADC access
External tamper pins
Independent, battery-operated power supply for real-time clock (RTC) and tamper detection modules
IRDA support
NTC temperature sensor
General-purpose tower plug-in (TWRPI) socket

Software Enablement

The TWR-KM35Z75M is enabled using NXP MCUXpresso SDK, MCUXpresso Config Tools, MCUXpresso IDE and a large partner ecosystem.

Integrated development environments

IAR Embedded Workbench®
Arm Keil^® Microcontroller Development Kit
NXP MCUXpresso
- An open-source software development kit (SDK)
- An easy-to-use integrated development environment (IDE)
- A comprehensive suite of system configuration tools, including pins, clocks, SDK builder and more
- Broad Arm ecosystem support through NXP Connect partners