Before the task of work on a day, roughly browse emails, see a series of quotes, samples, projects, and other requirements. One requirement to me, always a sudden requirement usually contains two words "Help" and "ESD". This special request is in a difficult moment, but I can't help but laugh, because this is a great business opportunity for the manufacturer of an ESD protection device.
Electrostatic discharge (ESD) may occur in electrically insulating objects, such as a person with a sudden discharge during contact with the ground metal object. The electrostatic potential can be as high as 30 kV, and the resulting discharge is very short, usually 100 ns, peak current can be up to 100 A. We all have experienced ESD in different forms, when we go home to touch the door handle, it produces electrostatic electricity, then it is called. This may instantly pain, energy through the slight blue spark of air cut "quite cool". But imagine that when you come out from the car, this happens when you refuel on your car. Entering and leaving your car may allow the electronic device that drives your navigation and "Help" system to be shocked. Although electric shock may not hurt us, even the slight pulse will damage the sensitive electronics in these systems, making them useless, not "cool".
For example, GPS or global positioning satellite subsystem helps your vehicle share its location, so that some maps and auxiliary systems reach your location. It is driven by an antenna that has a GPS transceiver circuit through a common "fish fin" module that can be seen outside the car. In some implementations, the transceiver circuit is located in a TELEMATICS Box, which plays an increasingly important role in today's automotive industry. As more and more interconnected vehicles enters the market, such as 4G cellular services, WiFi, GPS, and V2X (vehicles and vehicle and infrastructure communication) are implemented within TELEMATICS BOX.
The common devices common from the GPS transceiver circuit include an integrated circuit (IC) chip and associated radio frequency (RF) front end discrete components such as transformers and surface mount capacitors and resistors. The transceiver chip is getting stronger, integrated with more features, and reduces physical dimensions by reducing the geometric dimensions of the silicon process. The last point is critical in the existence of ESD - the smaller the industry trend has treated, the smaller the geometry, the chipset is more sensitive to ESD. This higher sensitivity causes the overall system (IC being placed in which) level ESD.
ESD fault talk before the message. In the end, they changed the new GPS transceiver IC for the next TELEMATICS Box, no longer needed to pass the desired ISO 10605 vehicle system ESD specification 8kv level. They can pass the highest level of 4KV, which requires an OEM manufacturer's exemption and is responsible for potential on-site failure.
The diagnosis begins with the inspection schematic and PCB layout. If it looks fine, then the next actual module is evaluated. Ansian Semiconductors typically use a test method called transmission line pulse (TLP), repeatedly determined the total energy of the rise time, pulse length, and ESD pulses. TLP is not discharged by an ESD simulator that does not match, but is discharged in a clean, 50 ohm environment, let us "see" the test device's clamp voltage.
After TLP testing for this special module, it is clear that the internal ESD clamp structure of the new GPS transceiver has a very low conduction and clamp voltage. Since most of these devices use ordinary Zener diode structures, breakdown voltages 7 to 10V, which makes it difficult to protect the ESD protection device of external low parasitic capacitance. Turn on this voltage point, in this level of clamps and transients throughout the entire pulse, these devices can allow most transient currents into the internal ESD structure of the GPS transceiver that cannot be survived at higher 8kV pulse energy. Some new plates for integrated external ESD protection devices have been tested, and there is no one that can exceed the desired presence, because they are all high pressure Zener-type structures.
Start talking about the latest SZESD9101P2T5G ESD protection devices, which uses Ann Many Semiconductor's integrated thyristor (SCR) ESD ESD9000 Series. Unlike the old Zener diode structure, the SCR structure is turned on in the same 7V level, but quickly returns to a very low 2 to 3V clamp voltage over 3 ns. This allows the ESD pulse transient current to be appropriately distributed to the ground without dissipating and subsequently destroying the GPS transceiver IC. Quickly connect the device and ESD test in a new module to get a good result, because SZESD9101 successfully protected GPS through the desired 8kv existence level.
With the recommended ESD protection device, the results of TLP and the upper management report 8kv through the results, thereby avoiding potential on-site faults. Although it certainly contributes to the industry's leading ESD protection technology, it helps troubleshoot and provide in-depth analysis to solve this problem is true ESD perception. I believe this is that everyone is seeking, to change the status quo, solve challenging problems, the most important thing is to keep the vehicle on the road. Therefore, in the morning, began in many emails. Please remember that someone in someone is experiencing a serious ESD failure in their car circuit, we will solve the problem: one module each time.
Original link: https://www.eeboard.com/news/walkie-talkie/
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