How Zaptics and Lumissil Are Rewiring the Global EV Charging Grid

MILPITAS, Calif. – November 09, 2026 – The transition to electric mobility is often framed by the general public as a battery problem, but behind the scenes, it is equally a communications challenge. Vehicles and chargers must speak a complex, secure language to negotiate power delivery, manage grid loads, and process payments automatically. The gold standard for this digital dialogue is ISO 15118, a protocol so demanding that it has traditionally forced automotive engineers to rely on expensive, power-hungry application processors.

Now, a new hardware partnership is challenging that paradigm. Lumissil Microsystems, a California-based analog and mixed-signal semiconductor provider, announced today that its Green PHY power-line communication (PLC) solution has been selected by Zaptics to support a new line of Electric Vehicle Communication Controller (EVCC) reference designs.

The collaboration aims to lower development hurdles and dramatically shorten the time to market for ISO 15118-compliant charging systems. By shifting the computational burden from traditional microprocessors to highly optimized microcontrollers, the alliance is attempting to democratize smart charging capabilities for budget-conscious vehicle platforms globally.

The Microcontroller Disruption: Engineering Simplicity

Historically, implementing the ISO 15118 standard has been an engineering headache. The protocol requires robust cryptography for secure "Plug and Charge" capabilities, IPv6 networking, and complex state machines. To handle this, Tier 1 suppliers have frequently defaulted to Linux-based application processors. While powerful, these systems introduce significant drawbacks for automotive applications: higher bill-of-materials (BOM) costs, increased power consumption, longer boot-up times, and a broader attack surface for cybersecurity vulnerabilities.

The Delhi-based control systems developer took a decidedly different approach. By building its EVCC products around controllers rather than processors, the firm optimized for cost, power efficiency, and automotive-grade reliability.

At the heart of this architecture is Lumissil’s CG5317 (and its CZ5317 variant), an AEC-Q100 Grade 2 certified HomePlug Green PHY modem. Designed specifically for low-power automotive environments, the chip operates on a single 3.3V power rail and handles the critical physical layer communication between the vehicle and the charging station. Integrating this silicon with a proprietary, highly optimized software stack allows the Indian engineering firm to execute complex cryptographic handshakes and TLS encryption on a microcontroller footprint.

This shift offers profound engineering benefits. Microcontrollers provide deterministic, real-time performance crucial for safety-critical automotive functions. Furthermore, modern automotive-grade microcontrollers are increasingly equipped with hardware cryptographic accelerators, offloading the intensive math required for digital signatures and freeing up memory—proving that a leaner architecture does not have to mean a compromise in security.

Battle-Tested in a Complex Grid

The fruits of this engineering philosophy are materialized in two distinct product variants currently rolling out to customers. The first is the Specter, a highly compact 45 by 45-millimeter System-on-Module (SOM) designed for deep integration into existing Vehicle Control Units (VCUs) or Battery Management Systems (BMS). It features onboard PLC transformers, analog filters, and supports contactor and lock motor functions via a CAN interface. The second is the Pearson, an IP65-rated standalone Electronic Control Unit (ECU) designed for direct vehicle mounting, featuring dual CAN 2.0B interfaces and an integrated H-bridge charge-port lock motor driver.

Yash Tambi, Founder and CEO of Zaptics, noted that the hardware and software stack were developed entirely in-house. He emphasized that the fully automotive-grade hardware has already been tested for interoperability with more than 35 different chargers across India, including real-world vehicle installations.

This local testing ground is a significant crucible. India's rapidly expanding EV infrastructure has historically been plagued by severe fragmentation and protocol misalignments, with interoperability failures sometimes leading to session failure rates as high as 40 percent. A system that can reliably negotiate charging sessions across dozens of disparate hardware setups in such an environment demonstrates a high degree of fault tolerance and protocol robustness. Both the Specter and Pearson currently support ISO 15118-2 and IEC/DIN protocols, establishing a solid baseline for smart charging communication.

Navigating the Global Export Hurdle

While success in the domestic market proves the technology's viability, exporting embedded automotive electronics to Western markets presents an entirely different set of challenges. It is not enough for a component to function correctly; it must seamlessly integrate into the highly regulated, standardized ecosystems of North American and European automakers.

Raphi Zadicario, Product Manager and Chief Architect at Lumissil, highlighted the distinct market differences across Europe, the U.S., China, Korea, and Japan. He specifically pointed to the prevalence of AUTOSAR and certified Vehicle-to-Grid (V2G) stacks in Western markets, alongside the rigorous vendor audits required by legacy automakers.

AUTOSAR (AUTomotive Open System ARchitecture) is the de facto software framework for Western Tier 1 suppliers, designed to promote software reusability and standardized interfaces. For an international supplier to gain traction, its firmware must speak this architectural language natively. Furthermore, any component interfacing with the high-voltage systems of an electric vehicle must undergo stringent ISO 26262 functional safety audits to achieve required Automotive Safety Integrity Levels (ASIL).

To address the evolving demands of these global markets, the engineering team is currently developing support for ISO 15118-20. This updated standard is the linchpin for bidirectional power transfer, or V2G, allowing vehicles to not just draw power, but feed energy back into the grid. Implementing V2G on a microcontroller architecture requires exceptional software optimization to manage the advanced energy transfer modes and heightened security protocols demanded by utility companies.

Accelerating the Path to Plug and Charge

The demand for sophisticated Electric Vehicle Supply Equipment (EVSE) and vehicle-side controllers is accelerating exponentially as automakers race to offer seamless, Tesla-like charging experiences. By leveraging proven Green PHY silicon and a pre-integrated software stack, the new reference designs effectively eliminate months of painstaking firmware development and compliance testing for vehicle manufacturers.

This pre-validated approach allows OEMs and Tier 1 suppliers to bypass the friction of hardware-software compatibility, enabling them to focus their engineering resources on higher-level product differentiation rather than reinventing the communication wheel.

Looking ahead, the collaboration is not stopping at the vehicle's edge. Plans are already underway to launch EVSE-side solutions in the coming months, utilizing the same controller-based philosophy to improve cost-effectiveness for charging station manufacturers. As the electric mobility sector matures, the companies that can deliver complex, secure interoperability without the bloat of traditional computing architectures will likely dictate the pace of the global grid's evolution.