MAX71335C - Poly-Phase Electricity Meter SoC


Advanced Metrology Provides the Best-In-Class Performance

•  Up to Seven Metrology Channels for Polyphase Metering and Up to Four Channels for Single-/ Two-Phase Metering

•  0.1% Typical Accuracy Over 5000:1 Current Range with Integrated Metrology ADCs

•  Integrated ADCs Support Current Transformers, Rogowski Coils, and Shunts

•  Three Remote ADC Interfaces for Current Sensing with Remote Shunts

●   Dedicated RTC Circuit Ensures Accurate Timekeeping

●   Integrated Security Engines for Secure Smart Metering

•  AES-128/192/256, and AES-GCM-128

•  True Random Number Generator

•  3DES

•  On-Chip CE-OnGuard Protects Metering Operations from Unauthorized Access, and Ensuring Authenticity of Peripheral Operations

•  Supports Welmec/MID

●   Rich Peripherals Support Reduces Board Space and Lowers BOM Cost

•  Low-Power ADC for Environmental Monitoring

•  LCD Controller Supporting Up to Eight Common Planes: 8x 36/6x 38/4x 40

•  SPI (Master and Slave), Master I2C, 4x UARTs, Two Smart Card Ports, Two Touch Switch Inputs

•  Two Touch Switch Inputs

•  38kHz IR Encoder/Decoder

•  Single-Cycle 32x32 + 64 Multiply-Accumulate Unit for Demanding Signal Processing

●   Dual 32-Bit Programmable Cores Provides High- Processing Power and Flexibility

•  Metering Core Up to 20MIPS at 20MHz, Up to 8KB RAM for Data and Code

•  Application Core Up to 20MIPS at 20MHz, 256KB/128KB Flash Code Space, 12KB Data RAM

●   Configurable Operation Modes Saves Power

•  1.6μA SLP Mode (VBAT_RTC)

•  14.6μA LCD Mode (VBAT_RTC and VBAT)

•  1KB NVRAM in SLP Mode, Optional 8KB NVRAM


The ZON™ M3S/M3SL and P3S/P3SL (MAX71315C/ MAX71314C and MAX71335C/MAX71334C) integrate dual 32-bit processors and security engines for demanding single phase (MAX71315C/MAX71314C) and poly-phase (MAX71335C/MAX71334C) metering applications with up to 256KB flash, 20KB RAM, and a single-cycle 32x32 + 64 multiplier. The application processor (MPU) is a 32-bit MAXQ®30 core. The metrology processor (or compute engine, CE) is a 32-bit processor dedicated to computing the metering parameters from voltage and current samples. The integrated security engines (AES-128/192/256, AES-GCM-128, DES, TRNG) provide fast data encryption and decryption for secure smart grid communications. Integrated 38kHz encoding and decoding functions saves BOM cost and reduces board space. Two touch switch pins enable capacitive touch detection.

The device family also integrates all the essential metering function blocks: LCD controller supporting up to 8 common planes with a maximum of 288 segments, real-time clock (RTC) with automatic      temperature compensation, and multiple serial communication ports (UART, I2C, and SPI).


●   1-Phase AMI Metering

●   3-Phase AMI Metering

●   Energy Monitoring