Isolated energy measurement chipset reduces design cost, size, and complexity

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By eeNews Europe

The company’s compact MAX78700/MAX78615+LMU isolated energy measurement chipset with preloaded firmware has been developed to help engineers meet challenges when embedding high-voltage AC (or DC) measurement into their design.

As in electricity utility meters, isolation must be maintained between different phases, which historically has been accomplished using bulky current sensors. For most other systems, however, the need for full galvanic isolation from the rest of the system is often required to meet safety standards. This demands additional isolation components that penalize both size and cost of the system.

The MAX78700/MAX78615 chipset addresses these challenges by integrating a unique isolated interface between the analog (MAX78700) and digital (MAX78615) domains and requiring only a single pulse transformer. This innovative approach significantly reduces size, complexity, and cost. This complete solution includes nonvolatile memory and preloaded application-specific firmware, providing an autonomous measurement subsystem ready for integration into any system.

The chipset is ideal for solar inverters, data centers, outdoor lighting, renewable energy systems, and smart grid applications.

The MAX78700/MAX78615 chipset integrates nonvolatile memory, upgradeable measurement firmware, isolated power delivery to up to three MAX78700s (from a
single MAX78615), and an isolated data path between ICs using a single pulse transformer.

The solution scales to thousands of volts of isolation and contains application-specific firmware for a wide range of energy-measurement requirements.

The chipset eliminates the requirement for an isolated power supply and bulky sense transformers and includes preloaded, field-upgradeable firmware that performs all the necessary signal processing, compensation, and data formatting for accurate real-time measurement.

Availability and Pricing

The MAX78615 processor is available in a small 24-pin TQFN package. The MAX78700 multichannel ADC is available in a small 10-pin µMAX package.

More information about the MAX78700/MAX78615+LMU isolated energy measurement chipset at


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