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Keysight Technologies today introduces an Electrical-Optical-Electrical (EOE) simulation solution in ADS 2026. Engineers can now simulate electrical-to-optical-to-electrical signal chains within a single design environment. This capability is increasingly important as AI infrastructure and high-performance computing drive demand for faster optical links. This type of analysis is essential for setting architecture and evaluating performance.

By 2029, 87% of hyperscale optical transceivers will operate at 800 Gbps or higher, with 1.6 Tbps and 3.2 Tbps on the horizon. With optical links connecting CPUs, GPUs, and high-speed SerDes interfaces, teams need to model interactions across electrical and optical domains. Legacy simulation workflows handle these separately, requiring results from different tools to be manually stitched together, potentially missing cross-domain effects that impact system performance.

The breakthrough EOE capability in ADS 2026 enables engineers to simulate the complete signal path, from transmitters through optical and photonic circuits to electrical receivers, in a unified workflow. The solution leverages Keysight’s High Speed Digital workflow with Keysight Photonic Designer. By simulating the mixed-domain signal chain before hardware implementation, teams can evaluate electrical and optical design tradeoffs and assess signal integrity against high-speed standards earlier in the design cycle.

Key benefits of the solution include:

• Detect signal integrity issues across electrical and optical domains before prototyping: Simulate high-speed SerDes digital channels and photonics IC behavior together. It catches cross-domain issues that surface only when you model both domains simultaneously.
• Simulate bidirectional optical links as they behave in the real world: Full-duplex optical simulation captures forward and backward signal propagation within an EOE channel. It’s a capability that previous tools could not perform.
• Assess nonlinear effects across multiple wavelengths for multi-lane interconnects: Wavelength division multiplexing support within EOE simulation flows lets engineers evaluate how optical nonlinearities affect performance across wavelengths. This addresses a growing concern as 800G and 1.6T optical links use multiple wavelengths simultaneously on the same waveguide. These modulations in wavelengths and non-linearities model together as a system.
• Obtain a realistic view of system-level signal quality: Noise modeling spans the electrical and optical domains simultaneously, enabling engineers to assess performance under realistic conditions rather than modeling each domain in isolation.
• Catch nonlinear effects before they reach hardware: Modulator bias-dependent and large-signal non-linear effects are visible within end-to-end simulations.
• Make electrical-optical design trade-offs in one workflow: The electrical channel and optical envelope simulators have a patent for multi-domain co-simulation bridges, which eliminates the need to move between separate tools to evaluate trade-offs.

Beyond system-level EOE simulation, ADS 2026 covers the full design flow from system down to component optimization. Through PDK support at the circuit level and Keysight RSoft integration at the component level, engineers get a true representation of photonic IC behavior, with no disconnect between the real chip and system-level simulation.

Niels Fache, Senior Vice President, Keysight, said, “AI infrastructure depends on 800 Gbps and 1.6 Tbps optical links to move data at scale. At these speeds, electrical and optical performance can no longer be modeled separately. With ADS 2026, engineering teams can now simulate those interactions before committing to silicon.”

The post Keysight Enables End-to-End Electrical-Optical-Electrical Simulation for Data Center and Ethernet Design appeared first on ELE Times.

In booth 470 (hall 7) at the PCIM Europe 2026 (Power Electronics, Intelligent Motion, Renewable Energy and Energy Management) Expo & Conference in Nuremberg, Germany (9–11 May), Infineon Technologies AG of Munich, Germany is showcasing its semiconductor portfolio for future-proof power infrastructure, AI data centers, robotics and electro-mobility...

In booth 318 (hall 9) at the PCIM 2026 (Power Electronics, Intelligent Motion, Renewable Energy and Energy Management) Expo & Conference in Nuremberg, Germany (9–11 May), ROHM is demonstrating how cutting-edge power semiconductor technologies contribute to higher efficiency, system miniaturization and reduced energy losses across automotive, industrial and infrastructure applications...

In embedded systems, where failure is not an option, NOR flash devices storing boot code, firmware images, and critical application data are subject to gradual wear over their operational lifetime. That wear is not invisible; it’s reflected in internal device registers accessible at runtime without the need for external test equipment. Per-sector erase cycle counts, single-bit and double-bit error correcting code (ECC) event counters, and hardware-accelerated cyclic redundancy check (CRC) integrity results collectively form a health profile.

This profile covers user-defined address ranges and is updated continuously as the system operates. On certain device variants, an on-board temperature sensor provides confirmation that the device is running within its rated thermal envelope. These are no fault flags that fire after something has gone wrong. They are observable quantities whose value lies in being monitored over time.

The central premise of flash diagnostics is shift from reactive fault handling to proactive health monitoring. Fault handlers consult device status when an operation fails.

In contrast, diagnostics applications read the same registers on a schedule, build a time series, and watch for early indicators of wear. Early warning paves the way for preventative maintenance, fixing impending problems before they trigger failure.

Reading wear, ECC, CRC, and thermal trends over time

Program/erase cycle counts per sector are the most direct measure of wear. Flash arrays in real-world applications are not erased uniformly. Sectors holding frequently updated data, such as fault codes logged by an automotive ECU or a partition used for over-the-air updates, accumulate cycles at a much higher rate than sectors holding static firmware.

Some NOR flash memories—such as Infineon’s SEMPER NOR Flash—offer built-in wear leveling defenses that distribute P/E cycles across the full address range. A diagnostics application periodically tracking per-sector counts can identify this imbalance early and provide the system with the information needed to act, whether by redistributing write activity or by flagging sectors approaching their service limit.

ECC event counts add a sensitivity that cycle counts alone cannot provide. Single-bit events are corrected transparently by on-chip logic and produce no visible effect on system operation, but their rate carries information about how individual cells are aging. A sector whose single-bit event rate begins to rise is showing early signs of cell wear, something the cycle count alone may not yet reflect.

When this trend is observed, rewriting the sector contents to restore cell charge state is one response the diagnostics system can initiate. To ameliorate system performance, the process can be scheduled during low-activity periods. Whether and at what threshold to trigger a refresh is a configurable decision. Double-bit events represent a harder boundary: the device detects them but cannot correct them, and their occurrence is recorded with sector address and timestamp for subsequent analysis.

CRC integrity checks over defined address ranges complement the bit-level view ECC provides, catching consistency issues that fall outside the scope of individual ECC words. For example, CRC is often used to validate a full firmware image region after an OTA update completes. Thermal reading, where available, confirms whether the device has been operating within its rated temperature range. This data assists in evaluating whether observed ECC trends reflect normal aging or accelerated cell wear from sustained thermal stress.

Diagnostics across AUTOSAR, Linux, and bare metal

The same NOR flash device frequently appears in multiple ECU variants within a single vehicle platform, each running a different software environment. A diagnostics software module such as SEMPER Diagnostics Library can be configured to span this portfolio, covering AUTOSAR Classic and Adaptive, Linux, QNX, RTOS, and bare-metal environments without changing the underlying health monitoring logic. What differs between environments is only the integration surface.

In AUTOSAR, the diagnostics module fits as a complex device driver. Positioned above the memory hardware abstraction layer, it accesses device-specific commands and register reads that the standard flash driver interface does not expose, while making its outputs available to upper-layer software components through defined RTE ports.

Figure 1 Here is how SEMPER Diagnostic Library software architecture operates in AUTOSAR environment. Source: Infineon

In a POSIX environment such as Linux or QNX, the same logic runs in user space and issues health queries through the IOCTL mechanism on an extended driver. Where the system is a heterogeneous SoC, a diagnostics agent in the real-time domain writes health query results to a shared memory region. A counterpart Linux user-space process then reads through a character device, packages with device identification and timestamps, and routes to a storage destination.

Within Linux, the Memory Technology Device (MTD) subsystem is the integration point for the flash driver, and IOCTL commands on an extended MTD driver are the mechanism by which device-specific health metrics cross the user-space boundary without touching standard read/write paths. On bare-metal or RTOS systems, the library links directly with the memory driver and is scheduled by the task manager.

In the case of SEMPER NOR Flash, SEMPER Diagnostics Library provides the diagnostic data, and the user is free to log it to local flash, route it to the cloud, store it in an external database, or any other destination that fits their system architecture. Similarly, fleet-connected deployments can route the same data off-device for population-level analysis. The underlying algorithms are identical across all environments; only the integration scaffolding differs.

Diagnostics library: Architecture and demo

Figure 2 Integration examples are shown for SEMPER Diagnostics Library module across different software environments. Source: Infineon

Figure 3 The demo setup is running SEMPER Diagnostics Library on Linux (RaspberryPi) while showing Erase Count and ECC Errors per sector. Source: Infineon

The SEMPER NOR Flash diagnostics software dashboard, shown below, visualizes per-sector erase counts and ECC counts in real time, along with device metadata—Device ID, Chip Size, Protocol, ECC State, Address Mode, Page Size—giving engineers a turnkey view of the flash health profile without requiring custom tooling.

Figure 4 The diagnostics software dashboard visualizes per-sector erase counts and ECC counts in real time. Source: Infineon

Fleet telemetry and predictive maintenance

Health metrics tagged with a unique device identifier and correlated with vehicle operating history become qualitatively more useful at scale. Patterns invisible at the level of a single device become apparent when data from a large population is examined holistically.

For example, a correlation between a specific duty cycle profile and accelerated sector wear may appear random as a single event, but causal when considered in aggregate. This is the difference between diagnosing a device that has already failed and identifying a population that may fail while every unit in it is still functioning normally.

Estimating useful lifetime also benefits from the same accumulated data. A static model applying a single worst-case endurance figure will produce overly conservative estimates. SEMPER Diagnostics Library’s adaptive lifetime estimation concept goes further: observed erase count progression, ECC event rates, and thermal history enable a per-device estimate that reflects how that specific unit has been used with the potential to refine it further through fleet-level pattern recognition, identifying trajectories that have historically preceded reliability events.

Act before wear

NOR flash devices save a continuous stream of health data in their internal registers, yet most systems discard it. Per-sector erase counts, ECC event trends, CRC integrity results, and thermal confirmation collectively describe how a device is aging under its actual operating conditions. The information is available at runtime, and no additional hardware is required to harvest it. The longer it is collected, the more valuable it becomes.

A diagnostics framework such as SEMPER Diagnostics Library captures this data, made possible via hardware such as SEMPER NOR memory, consistently across AUTOSAR, Linux, and bare-metal environments, routes it across processing domain boundaries, and makes it available for both on-device response and population-level analysis.

This gives engineers advanced notice to act before wear affects system reliability. In applications where that lead time separates a scheduled maintenance event from an unplanned failure, the case for building it in from the start is clear.

Saurabh Tripathi is senior applications engineer at Infineon Technologies.

Related Content

• The Shift from 2D to 3D NOR Flash
• Flash 101: NAND Flash vs NOR Flash
• NOR Flash Next in AI-Driven Memory Crunch
• NOR flash memory certified for ASIL-D functional safety
• How NOR flash helps overcome design challenges in wearables

The post Flash diagnostics and health monitoring for NOR memory appeared first on EDN.

КПІ розвиває дуальну освіту разом із партнерами kpi пн, 05/25/2026 - 22:45

Відзнака Міністерства освіти і науки України kpi пн, 05/25/2026 - 22:41

Нагороджено медаллю «За працю і звитягу» Антона Олексійчука kpi пн, 05/25/2026 - 22:35

Engineers must carefully manage power, protection, and sensing interactions at every design level to achieve reliable, always-on operation in a body-worn form factor. (Source: Getty Images)

Continuous glucose monitors (CGMs) have reshaped diabetes management by delivering real-time glucose readings, freeing patients from frequent finger-stick testing. These compact, wearable devices not only enhance quality of life but also allow clinicians to adjust therapy based on accurate, continuous data streams.

Behind this innovation lies a complex engineering challenge: Designers must develop a device that operates safely and reliably on a micro-scale power budget, fits within a compact, body-worn form factor, and maintains precise sensing accuracy in all conditions. Every component, whether analog, digital, power management, or protective, must contribute to long-term reliability and patient comfort. In many designs, even microamp-level leakage or a single mechanical failure point can limit device lifetime or compromise reliability.

Magnetic sensing, particularly tunnel magnetoresistance (TMR) technology, offers a practical approach for implementing sealed, contactless activation and other event-based state-detection functions without materially impacting battery life. This article examines the role of magnetic sensing in CGM architectures, explains the operating principles of TMR switches, and discusses their applications for activation, alignment confirmation, and auxiliary-state detection. Design tradeoffs, implementation considerations, and package-level constraints are also explored to help engineers evaluate when TMR sensing is appropriate in CGM designs.

The role of CGMs in connected healthcare

CGMs are central to modern diabetes care. They measure glucose concentration in interstitial fluid using a sensor inserted beneath the skin, which transmits readings wirelessly to a smartphone, insulin pump, or cloud-based management system.

Connected drug delivery system example (Source: Littelfuse Inc.)

The benefits of CGMs are well-established: reduced glycemic variability, better HbA1c levels, and fewer hypoglycemic episodes. As the technology matures, CGMs are now prescribed for a wider population, including patients with Type 2 diabetes, gestational diabetes, and even pre-diabetic conditions, expanding their relevance across preventive medicine and chronic care.

From an engineering perspective, these devices embody the broader trend toward connected, always-on healthcare systems, in which safety, data integrity, and energy efficiency are equally critical.

System architecture and design constraints

A typical CGM system includes five key components:

• The glucose sensor and analog front end amplify and condition microvolt-level signals from the biosensor.
• The microcontroller processes data, handles algorithms, and manages wireless communication via Bluetooth Low Energy or proprietary protocols.
• The power-management circuitry regulates energy from a small rechargeable or disposable battery.
• The wireless interface communicates readings to companion devices or cloud platforms.
• Temperature sensing, protection, and activation circuits safeguard operation and enable user interaction.

Simplified CGM system block diagram (Source: Littelfuse Inc.)

These modules must function continuously for seven to 14 days on a single charge, all while exposed to motion, sweat, temperature fluctuations, and electrostatic discharge (ESD). Component size, thermal behavior, and power efficiency dictate patient comfort and product usability.

Engineering challenges unique to CGM design

Engineering challenges in CGM design include achieving ultra-low power consumption and extreme miniaturization in limited PCB space while maintaining electrical safety/isolation and environmental resilience. Designs must also meet stringent regulatory compliance requirements:

• Ultra-low power consumption: Every microamp of leakage current reduces battery life. Components must have negligible quiescent draw.
• Miniaturization: Patch-style and implantable CGMs allow only millimeters of PCB space, demanding small-package, high-performance devices.
• Electrical safety and isolation: Circuit faults must be contained quickly to protect the patient and device integrity.
• Environmental resilience: Resistance to sweat, vibration, and humidity ensures consistent operation throughout the wear cycle.
• Regulatory compliance: Designs must comply with IEC 60601, ISO 13485, and 21 CFR 820 requirements for safety, quality, and EMC performance.

Meeting these demands requires careful component selection and system-level integration.

Magnetic activation for sealed, contactless operation

Power-on and reset functions are fundamental in wearable devices. Traditional mechanical pushbuttons introduce contamination paths, wear over time, and complicate waterproofing. The activation circuit keeps energy consumption during the shelf life to a minimum, ensuring the device remains safe to operate after 24 months. Magnetic activation provides a contactless alternative that enhances durability and hygiene.

Three magnetic-switching technologies are available: reed relays, Hall-effect sensors, and TMR switches. Each presents tradeoffs in power consumption, sensitivity, and footprint (see Table 1 for a comparison). In practice, the key differentiator is standby current, whereby TMR operates in the nanoamp range, versus milliamps for typical Hall-effect devices.

Table 1: Sensing technologies comparison (Source: Littelfuse Inc.)

TMR sensors offer a highly effective combination of performance characteristics for CGM applications: nanoamp-to-microamp power levels, compact LGA packages, and omnipolar detection for flexible magnet placement.

For example, Littelfuse TMR magnetic switches detect flux changes as low as 9 Gauss and draw only 160 nA in low-speed mode. Their contactless operation enables features such as automatic power-on when the device is applied to the skin or activation during packaging removal. Because they have no moving parts, TMR switches are immune to vibration and moisture, providing a lifetime of tens of billions of switching cycles.

TMR magnetic switches such as the TMR LGA4 Switch LF21173TMR enable contactless activation through a sealed enclosure. (Source: Littelfuse Inc.)

By eliminating mechanical interfaces, engineers reduce mechanical failure risk, improve sealing, and extend battery life—all critical for patient-worn electronics. This approach makes TMR switches particularly attractive for designs in which activation must remain available throughout storage and use without impacting overall system power budgets.

Thermal monitoring and patient safety

Temperature sensing plays multiple roles in CGM design:

• Electronic safety monitoring detects abnormal heat buildup from circuit faults or battery degradation.
• Patient protection prevents surface temperatures that could irritate or burn the skin.
• Sensor compensation adjusts for temperature-dependent enzymatic reactions that influence glucose readings.

Compact NTC thermistors, such as Littelfuse’s 0803-KR, 0603-RB, and 1206-LR series, offer ±5% accuracy in packages as small as 1.6 × 0.8 × 1.0 mm. Engineers often use multiple thermistors: one near the biosensor for reaction compensation and another near the battery or power-management circuitry for thermal safety monitoring.

Precise thermal feedback not only protects users but also enhances measurement accuracy, contributing directly to clinical reliability.

The number, location, and role of temperature sensors vary by CGM architecture, but designers generally distinguish between temperature sensing for safety monitoring and temperature sensing used for measurement compensation.

Integrating protection and sensing for reliable operation

Effective CGM design blends protection, sensing, and activation elements into a cohesive system. Integration offers several key benefits:

• Extended battery life through ultra-low leakage protection and sensing components
• Improved mechanical reliability by eliminating moving parts and exposed contacts
• Simplified certification when using pre-qualified components compliant with medical standards
• Enhanced user confidence through consistent, failure-free performance

When these design principles are applied, engineers can focus on refining algorithms, connectivity, and patient-experience features rather than troubleshooting hardware faults.

Regulatory and compliance considerations

Every CGM must meet stringent international standards to ensure safety and performance. Table 2 outlines the most relevant to electronic subsystems.

Table 2: Applicable international standards for CGM compliance (Source: Littelfuse Inc.)

Choosing electronic components with existing documentation for these standards can streamline risk management files and accelerate regulatory review.

Future trends in CGM and wearable design

As wearable healthcare expands, designers are targeting a reduction in device size, longer lifetimes, multi-sensor integration, and cloud-connected analytics. Each evolution places an even greater emphasis on power efficiency and electrical safety.

Emerging technology trends include:

• The integration of multi-parameter sensors (glucose, lactate, temperature, and hydration)
• The use of energy-harvesting or inductive-charging technologies to extend operating life
• The implementation of advanced protection monitoring, such as built-in diagnostics for ESD or fuse status
• The development of biocompatible, flexible electronics to further improve patient comfort

Component suppliers that offer medically focused design support and validated protection portfolios will play a crucial role in accelerating these innovations.

CGMs exemplify the convergence of biomedical science and advanced electronics. To achieve reliable, always-on operation in a body-worn form factor, engineers must carefully manage power, protection, and sensing interactions at every design level.

By integrating TMR magnetic switches for contactless activation, NTC thermistors for safety and compensation, low-leakage ESD/TVS diodes for transient protection, and miniature medical-grade fuses for fault isolation, developers can meet the strict performance and safety requirements of modern medical devices.

The result is a new generation of CGMs that are smaller, more power-efficient, and more reliable, meeting the practical constraints of wearable system design while enabling accurate, continuous monitoring.

About the author

Marco Doms is a senior manager of business development new platforms at Littelfuse Inc. Doms studied electrical engineering and holds a Ph.D. in MEMS. He was the head of R&D at two other sensor companies before joining Littelfuse in 2022. Doms has a long history in position sensors (especially xMR) and managing R&D and Innovation teams—from chip to system level. At Littelfuse, he started as an innovation manager, led the EBU Advanced Development team, and introduced an Innovation/Idea Management process. In his current role, Doms is responsible for several platforms with entirely new products or product features that require additional internal and customer coordination.

Marco Doms is senior manager of business development for new platforms at Littelfuse Inc.

The post Designing low-power CGMs with TMR-based magnetic sensing appeared first on EDN.

КПІ ім. Ігоря Сікорського, БО БФ «КОЛО» та Beredskapslyftet реалізують міжнародний проєкт «Ерготерапія без кордонів» в Україні kpi пн, 05/25/2026 - 16:11

While its vehicle battery resurrection skills are uncertain at best, this device also offers other useful abilities.

Two-plus years back, within my teardown of my PowerStation PSX3:

which I described at the time as being:

…(among other things) a portable recharger and jump-starter of vehicles’ cells. It’s also a portable tire inflater. And it’s an emergency light and USB power source, too…

I took advantage of the opportunity to also editorially “rip” into three newer solid-state and Li-ion battery-based versions of the same concept:

I tried three of these widgets, one claiming to deliver 1200 A of “peak” cranking juice:

Another spec’ing 1500 A:

And a third that promised to deliver 2000 A:

They all promptly went back to Amazon as full-refund returns. Now granted, if someone had left their interior dome light on too long and the battery was drained too low to successfully turn over the engine but still had some “life” one of these might suffice…And I’ll grant them one other thing: they’re certainly small and light.

But 2000 A of cranking current? Or even 1500 A? Mebbe for a fraction of a second, the time necessary to drain an intermediary capacitor, but not long enough to resurrect a significantly drained battery. Therefore, the quotes I put around the word “peak” earlier. Such products exemplify the well-worn saying, “mileage may vary”. Give me an old-school lead acid battery instead, any day!

Regarding my “They all promptly went back to Amazon as full-refund returns” comment, while that was my original intent, I didn’t end up fully actualizing it. The “1200 A” and “1500 A” variants indeed did get shipped back to the retailer. But, curiosity-motivated, I decided to keep the “2000 A” model, Spanarci’s ZETA2000, around if for no other reason than as a future teardown candidate.

Calling Cupertino…

That future is today. As usual, I’ll start with some outer box shots (sparing you the blank sides), as usual accompanied by a 0.75″ (19.1 mm) diameter U.S. penny for size comparison purposes:

Although my skepticism about the device’s jump-starting potential is already obvious at this early point in the writeup, I was admittedly impressed by the aesthetics and overall packaging of the product. Dare I even say it was Apple-reminiscent?

The cleverly labeled “Never Say Never” envelope, reminiscent (at least to me) of SpaceX’s three autonomous spaceport drone ships (i.e., floating rocket booster landing pads), “Of Course I Still Love You”, “Just Read the Instructions” and “A Shortfall of Gravitas”, contains literature bits:

Gee, I wonder what’s inside this translucent plastic sleeve?

To stretch the suspense, I’ll temporarily set it aside and investigate the lower box level instead:

Within is the to-vehicle battery cable harness, conveniently accompanied by USB-A-to-USB-C and USB-C-to-USB-C cables useful both for recharging the device’s internal battery pack and for powering other connected devices. Hold that thought:

Here’s the male connector at the end of the cable harness…

Burlesque finale

And here’s what it plugs into…

at out dissection patient, finally unswathed for its reveal. Top first:

Here’s the front:

Underneath the rubberized flap labeled “INPUT OUTPUT” at the right end are, likely unsurprisingly, first a bidirectional USB-C PD 30-W connector used for both device charging and for charging/powering another tethered device, such as a smartphone. The other, USB-A in form factor, is unidirectional (output-only) for similar tethered device “juicing” purposes.

Onward. Left side:

Rear; under this flap, cryptically (ha!) labeled “JUMPER CABLE” is the battery-cable harness connector you saw earlier:

And what the heck is that on the right side? A multi-LED strip, creating a 300-lumen four-mode (50% and 100% brightness stable, and both SOS and strobe pattern) flashlight, that’s what it is!

Last but not least, here’s the bottom view:

accompanied by a zoom-in of the specs:

Before opening ‘er up, I’ll note a few other feature set nuances. Like the conventional (i.e., AC-powered) solid-state charger that I tore down earlier this month, it supports various safety features such as short-circuit and “reverse” protection:

That said, there’s also “FORCE” support for dead cells and daring users:

The teardown’s the thing…

And now, let’s dive inside. Zoom back out on that earlier bottom overview shot and you’ll discern eight round rubber pieces, one in each corner and two more both at top and bottom:

I bet you can guess what comes next:

Eureka! Screw heads (trust me, they’re there, deep inside the recessed dimness)!

And what comes after that, dear readers? You got it right:

Dare I draw another analogy to Apple craftsmanship? Seriously, I’m impressed with the neatness and overall robustness of the insides, too!

Here’s the inside of the case topside:

…wherein I’ll detail the insides of the thing

And the overview that’s likely of greater interest to all of you!

Dominating the landscape, aside from the display, that is:

is the largest IC on this side, at center (horizontally) and toward the bottom (vertically). It’s Holtek’s HT67F489 8-bit RISC microcontroller, unsurprisingly with an integrated LCD controller and also containing (among other things) 8 Kwords of flash memory (4 Kwords on the more modest HT67F488 sibling, which the datasheet informs me (PDF) has been discontinued, anyway), 256 bytes of RAM and 64 bytes of EEPROM (none on the HT67F488). Also note two mode-select switches at far right, which mate to rubberized front panel buttons.

Let’s get that PCB out, shall we? Three screws hold it in place:

Guess what comes next?

In addition to noticing the now-absent screws (and their previously visible heads) in the next photo, I’d also like to draw your attention to the smaller but still-square IC to the right of the aforementioned HT67F489. It’s Southchip Semiconductor Technology’s SC2001 USB-PD controller. Given what you already know about the capability of the USB-C connector on the front of the device, this chip’s presence and functions shouldn’t be a surprise.

Here goes nothing:

My, what a big power source you have…

At left is the 44.4 Wh lithium polymer battery pack:

To its right is a beefy Sanyi Seiko SEV8-P-112DM 4-pin high-power relay:

soldered to a mini-PCB:

And the remainder of the compartment mostly consists of a bunch of now-disconnected wire harnesses:

The destination of one of them was, I admit with no shortage of chagrin, initially identity-baffling to me, until I pulled it out. See that gold-colored half-oval to the far right?

Oh yeah. The LEDs. Duh on me:

Underneath that large green region on the PCB underside is, as far as I can feel, nothing notable save for mounting-bracket sites and solder points related to the LCD on the other side:

The PCB-mounted speaker in one corner delivers a loud “beep” tone if, for example, you’ve got your to-battery connections reversed:

The one next to it is “just” an inductor (L1 is peeking out from the PCB under the white glue):

It, along with the rest of the components surrounding it (and some of those on the other side), implements a largely unmemorable power management subsystem.

In closing, I’ll share a side view of the USB-C and USB-A connectors; since the PCB is upside-down from its normal operating orientation, so are they:

…the better to incinerate you with, my dear

With that, I’ll close for today. Speaking of closing, I’ll keep the device disassembled for a while post-publication of this teardown. Then I’ll carefully reassemble it in the hopes of resurrecting it. If you smell smoke, see flame, or hear a loud “boom”, you’ll know my efforts didn’t succeed.

—Brian Dipert is the associate editor, as well as a contributing editor, at EDN.

Related Content

• The PowerStation PSX3: A portable multifunction vehicular powerhouse with a beefy battery
• NOCO’s Genius 1: A trickle charger that tries harder
• A battery charger that loudly hums: Dump it or just make it dumb?
• Dead lead-acid batteries: Desulfation-resurrection opportunities?

The post Portable jump starters: A dubious primary use case, but not a total waste appeared first on EDN.

КПІ ім. Ігоря Сікорського — на «Фестивалі кар’єри» на ВДНГ kpi пн, 05/25/2026 - 12:33

Gas discharge tubes (GDTs) harness the physics of controlled sparks to provide reliable surge protection, making them a fundamental safeguard for modern electronic circuits.

They are deceptively simple devices that rely on ionized gas to tame the chaos of voltage surges. When a transient spike threatens sensitive circuitry, a GDT responds with a controlled spark, safely channeling excess energy away from the system.

Compact, rugged, and reliable, these components have become indispensable in applications ranging from telecom lines to industrial equipment. In essence, GDTs turn sparks into protection, making them a cornerstone in the engineer’s surge-defense toolkit.

It’s worth noting that GDTs are sometimes referred to as plasma arrestors. The two names describe the same device; a sealed tube filled with inert gas that forms a plasma arc when voltage exceeds its breakdown threshold. “GDT” is the term most often used in engineering literature and standards, while “gas plasma arrestor” tends to appear in catalogs or marketing to highlight the plasma discharge mechanism.

Inside the spark: How GDTs work

From the first spark to the final safeguard, gas discharge tubes show how even the simplest devices can deliver powerful protection where it matters most. To understand why, let us take a closer look at how they work.

At the heart of a GDT is a sealed chamber filled with inert gas such as neon or argon. Two electrodes face each other across a small gap inside this chamber. Under normal operating conditions, the gas is non-conductive, and the tube behaves like an open circuit. But when a voltage surge pushes the potential across the electrodes beyond the breakdown threshold, the gas ionizes. This ionization triggers a plasma discharge—controlled spark—that suddenly makes the tube conductive.

The plasma arc provides a low-resistance path, diverting the surge current safely away from sensitive components. Once the surge subsides and the voltage drops below the sustaining level, the plasma extinguishes, and the tube returns to its insulating state. This simple cycle—breakdown, conduction, recovery—is what makes GDTs both rugged and reliable in protecting circuits against transient overvoltages.

Figure 1 A medium-duty 2-electrode gas discharge tube safeguards telecommunications, industrial, and consumer electronics from voltage surges. Source: Bourns

Shared sparks, shared protection

Building on the fundamentals, the next nuance lies in how protection is applied across conductors. A two-lead GDT serves as a straightforward single-path protector, perfect for shunting individual DC rails or coaxial cables to ground. But when you place two separate two-lead tubes across a data pair, they will never fire at precisely the same instant, leaving a harmful “transverse voltage” between the lines.

A three-lead GDT solves this by enclosing both conductors in a common gas chamber. The moment one side ionizes, the entire tube triggers, discharging both lines to ground simultaneously. This synchronized action delivers the balanced protection that sensitive telecommunications and differential data circuits demand.

Figure 2 A 3-lead GDT ensures simultaneous crowbar action across differential lines, preventing unbalanced residual voltages during a surge event. Source: Littelfuse

It’s important to note at this point that standard GDTs are commonly available in both 2- and 3-electrode configurations, whereas high-voltage variants are primarily limited to 2-electrode designs with select 3-electrode exceptions. While 2-electrode devices are typically deployed for either line-to-ground or line-to-line protection, a 3-electrode GDT provides the advantage of addressing both protection paths within a single component.

Practical implementation of GDTs

When selecting a GDT for a specific application, the primary objective is to ensure the device remains inactive during normal operation while reacting instantaneously to overvoltage transients. This requires careful evaluation of key electrical parameters, starting with the DC spark-over voltage. To prevent “nuisance” triggering, the GDT’s minimum breakdown rating should typically be 1.2 to 1.5 times the peak operating voltage of the system.

Furthermore, because GDTs are “crowbar” devices, engineers must account for follow-on current, the current that continues to flow through the ionized gas after the surge has passed. If the system’s power source can sustain this arc, additional current-limiting components or a coordinated circuit design may be necessary to ensure the GDT successfully resets to its high-impedance state once the transient is cleared.

However, follow-on current is often absent from GDT datasheets because it’s not a fixed constant of the device, but rather a system-dependent behavior. A GDT is essentially a triggered short circuit; once ionized, its resistance drops so low that the resulting current is determined almost entirely by your power supply’s voltage and internal impedance.

While manufacturers provide the arc voltage and the glow-to-arc transition current, they cannot predict your specific source’s capacity to sustain that arc. Consequently, engineers must use those parameters to calculate the “holdover” risk themselves, often necessitating components like metal oxide varistor (MOV) to effectively “starve” the arc and allow the GDT to reset.

To round out the technical profile, several other parameters define a GDT’s performance and longevity. Maximum impulse spark-over voltage is critical, as it indicates the highest voltage level the device allows during a fast-rising surge before it triggers. To gauge durability, engineers look at nominal impulse discharge current, which is the peak surge current the GDT can survive for a set number of pulses, and alternating discharge current, which measures its ability to handle sustained AC faults.

Additionally, maximum capacitance must be minimal to ensure signal integrity in high-frequency lines, while minimum insulation resistance ensures the GDT remains electrically “invisible” until a surge occurs.

Figure 3 Plot illustrates the GDT voltage breakdown characteristic. Source: Author

As a worthy take on paper, the GDT’s protective behavior is defined by its transition through distinct electrical phases, captured sequentially in Figure 3. The process initiates with the sparkover voltage, the exact point where the internal gas ionizes and becomes conductive. Immediately following this breakdown, the voltage falls to a relatively stable plateau known as the glow region, where current flows but remains limited.

As the surge energy intensifies, the device undergoes the rapid glow to arc transition, the critical threshold where the discharge collapses into a highly conductive plasma. This leads immediately to the arc voltage, the final “crowbar” state where the voltage drop plummets to its absolute lowest point. Identifying this transition sequence is vital, as the low arc voltage is precisely what triggers the risk of sustained follow-on current from the system’s power source.

GDTs are often evaluated against IEC 61000‑4‑5, the international surge immunity standard, because their protective behavior directly addresses the transient overvoltages defined by this test. The standard specifies surge waveforms—most notably the 1.2/50 µs voltage impulse and the 8/20 µs current impulse—to replicate lightning‑induced or switching transients. In these scenarios, GDTs act as frontline protectors, clamping and diverting surge energy away from sensitive equipment to ensure compliance and resilience.

Bonus insight: How to test a GDT surge arrestor

Have you ever wondered how to verify whether a GDT surge arrestor is still healthy and ready to protect against lightning, static, or electromagnetic pulse (EMP) events? An EMP is a sudden burst of electromagnetic energy—often from lightning strikes, solar storms, or even man-made sources—that can damage sensitive electronics. The only definitive way to confirm a GDT’s readiness is to make the device “fire”.

The most reliable approach is a DC high-voltage ramp test, performed with a power supply or a megohmmeter. Because a GDT behaves like an open circuit under normal conditions, you gradually increase the DC voltage across its terminals until it reaches the rated breakdown point. To ensure safety and prevent excessive current once the tube fires, a series resistor should always be included in the test circuit. This resistor limits the surge current, protects the power supply, and prevents overstressing the GDT during repeated tests.

Sparking applications, igniting ideas

Gas discharge tubes prove their worth across a wide spectrum of systems. In telecommunications, they safeguard MDF modules, xDSL equipment, RF systems, antennas, and base stations. In industrial and consumer electronics, they protect power supplies, surge protectors, alarm systems, and even irrigation systems.

Positioned in front of and in parallel with sensitive lines—power, communication, signal, and data transmission—GDTs shield equipment from transient surges caused by lightning strikes or switching operations. Under normal conditions they remain invisible to the signal, but when an overvoltage surge arrives, they switch to a low-impedance state and divert the energy safely away from the circuitry.

These sparks of protection are more than circuit defense; they are design opportunities. For makers and engineers, the challenge is to take this proven sequence from sparkover to arc and reimagine it in your own projects. Every surge control is a chance to build systems that are not only safer but smarter. So let the sparks inspire you: experiment boldly, refine relentlessly, and turn protective theory into resilient innovation.

T. K. Hareendran is a self-taught electronics enthusiast with a strong passion for innovative circuit design and hands-on technology. He develops both experimental and practical electronic projects, documenting and sharing his work to support fellow tinkerers and learners. Beyond the workbench, he dedicates time to technical writing and hardware evaluations to contribute meaningfully to the maker community.

Related Content

• Power-Back Surge Protection Circuit
• Overvoltage-protection circuit saves the day
• Robust overvoltage protection in high-density electronics
• How to prevent overvoltage conditions during prototyping
• Gas Discharge Tubes: Old Protection in a New Bottle–Literally

The post Gas discharge tubes (GDTs): From sparks to circuit protection appeared first on EDN.

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