Maxim reference platform speeds design of next-gen smart meters

by Toni McConnel , TechOnline India - October 13, 2011

It is designed to provide utility companies a versatile way to evaluate smart grid technology

The Newport smart meter reference platform from Maxim Integrated Products is designed to provide utility companies a versatile way to evaluate smart grid technology and manufacturers an easy-to-use smart-meter design to accelerate time to market. High integration and best-in-class accuracy reduce infrastructure costs. The Newport platform provides solutions for metrology, communication, security, interface, power, and timekeeping to the smart grid. A separate G3-PLC concentrator board is available to support meter-to-concentrator communications testing.

 

The Newport evaluation platform integrates the 71M6541 energy-metering system on chip (SoC) that provides 0.1% accuracy across a wide current range of 2000:1. The G3-PLC chipset, which includes the MAX2991 and MAX2992, features adaptive tone mapping, notching, and robust mode to ensure communication in the noisiest of conditions. The MAXQ1050 secure microcontroller supports advanced and scalable encryption standards and protects against physical attacks from hackers.

The Newport smart meter reference platform is designed to provide the flexibility to handle uncertainties such as security algorithms, different communication protocols, and the need for field-upgradable meters. Designers can use the platform to evaluate the MAX2991/MAX2992 G3-PLC compliant chipset, the 71M6541 metering SoC, and the MAXQ1050 secure microcontroller for their next-generation smart meters.

 

The Newport platform includes two communications sockets, allowing for independent neighborhood area network (NAN) and home are network (HAN) interfaces. Maxim’s G3-PLC chipset (MAX2991/MAX2992) is installed in one socket to provide communication for either meter to concentrator (route A), meter to

in-home display and home gateway (route B), or both. . The chipset complies with the emerging IEEE P1901.2 standard for OFDM-based communication over power lines and offers guaranteed interoperability. The MAX2992 also includes an on-chip CCM authentication coprocessor with AES-128 encryption/decryption.

The 71M6541 highly integrated metering SoC provides the metrology for the Newport platform and features < 0.1% accuracy over the -40 degrees Celsius to +85 degrees Celsius industrial temperature range and 2000:1 current range. The 71M6541 combines a programmable and customizable 32-bit metrology computation engine, a 22-bit delta-sigma ADC featuring the company’s Single Converter Technology; a 5MHz 8051-compatible MPU core with a low-power RTC and digital temperature compensation; flash memory; LCD driver; UARTs; and I2C interface.

 

This combination of blocks allows the system to be optimized for specialized measurements and to work with various sensors including shunts, current transformers, and Rogowski coils. According to the company, the Newport platform is also the only solution today that supports isolated shunt-metering technology that reduces BOM cost, while enhancing reliability and immunity to magnetic tampering.

The Newport platform adds the MAXQ1050, which supports advanced asymmetric encryption schemes such as elliptic curve and also protects against physical hacking. The MAXQ1050 incorporates a sophisticated security mechanism to protect secret key data; two self-destruct inputs, and various other environmental monitors (temperature and voltage sensors) erase secret key data when an attack condition is detected, thereby preventing sensitive information from falling into the hands of an attacker. The device supports high-speed encryption with hardware accelerators for AES, RSA, DSA, ECDSA, SHA-1, SHA-224, SHA-256, and 3DES. A true hardware random-number generator is included for key generation and challenge generation.

 

Complete power management is provided by the MAX17498, a current-mode pulse-width-modulated regulator for AC-DC and DC-DC power-conversion applications. The DS3231M real time clock offers enhanced timing accuracy, and the MAX13256 and MAX13412 provide an isolated RS-485 interface.

Maxim will be demonstrating the Newport Smart Meter reference platform at several international venues. Interested parties are encouraged to visit Metering, Billing/CRM Europe (October 4–6, Booth E70); CEATEC Japan  (October 4–8, Booth 7F06); and Metering, Billing/CRM Latin America (October 25–27, Booths 5, 6 and 7).

 

The Newport Smart Meter reference platform will be available for sampling by qualified customers. To request a sample, visit www.maxim-ic.com/Newport.

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