New ESD anti-static solution for NFC equipment interface

1、 What is an NFC device

NFC (Near-field communication) equipment is a wireless communication technology, which can realize short-range wireless communication and data exchange. It is based on Radio Frequency Identification (RFID) technology and Internet technology, using radio waves to transmit information between devices.

NFC devices usually consist of two parts: one is a reader/writer, used to read and write information on NFC tags or devices; The other is an NFC tag or device used to store and transmit information. For example, a mobile phone can serve as an NFC reader/writer, and an NFC label can be a regular piece of paper with information written on it, which can be read and written by the phone.

NFC technology has a wide range of applications in daily life, such as mobile payments, public transportation, smart homes, ticketing services, etc. Users can use NFC devices to pay for goods or services, enter public transportation or cultural venues, control household appliances, obtain ticketing information, and more. At the same time, NFC technology also provides more business opportunities for enterprises, such as promotional activities, providing customer service, and so on.

In short, NFC devices are a convenient and fast wireless communication technology that can provide users with a more convenient life experience and provide enterprises with more business opportunities.

2、 Necessity of NFC equipment anti-static

Anti static of Near-field communication equipment interface is very important, because static may have a negative impact on equipment performance, or even lead to equipment damage. In NFC device interfaces, charges may accumulate on the metal components of the device and generate an electric field around the interface. If static electricity is not properly handled, it may cause damage to the equipment.

3、 NFC equipment interface anti-static scheme

The following are some common methods to prevent static electricity from affecting NFC device interfaces:

Use metal shielding covers, use static eliminators, and use interface anti-static devices. At present, using anti-static devices ESD is the most effective and cost-effective solution. It is necessary to provide anti-static protection devices above 18V. Shanghai Leiditech has provided a board level design solution for the following series of devices.

NXPNTAG21 series

NXP MIFARE Classic Series

NXP MIFARE DESFire series

NXP MIFARE UItralight series

Sony FeliCa column

STMicroelectronics ST25 column

Infineon SLE column

Broadcom BCM2079x Series

Samsung TecTiles column

AMSAS395x series

This article discusses the use of Shanghai Leiditech's large scan ESD devices ULC2421CS and ULC2442CS to protect these chips on small devices such as smartphones, watches, and bracelets.

4、 What is circuit anti-static back scanning technology (snap back)

Snap back technology is a commonly used electronic circuit technology used to protect electronic devices from the effects of electrostatic discharge (ESD). ESD can generate high voltage discharge between two objects with different potentials, which may damage electronic components. Snap back technology protects circuits by using semiconductor structures with negative resistance regions.

When an ESD event occurs, the Snap back device will trigger and absorb large currents, resulting in a significant decrease in the voltage of the device. This voltage drop helps prevent ESD from damaging devices by limiting the amount of energy that can be dissipated. After an ESD event, the Snap back device will automatically return to its normal state, restoring the circuit to normal operation.

Snap back technology is commonly used in various electronic components, including diodes, transistors, and integrated circuits (ICs). It is an effective method of protecting ESD, which can ensure the reliable operation of electronic circuits in a wide range of applications.

5、 Advantages of circuit anti-static scanning technology

Snap back technology has the following advantages:

High reliability: Snap back technology can effectively protect electronic components from ESD damage, thereby improving the reliability and stability of circuits.

Quick response: Snap back technology can respond to ESD events within milliseconds, protecting the circuit from the impact of instantaneous high voltage.

Automatic recovery: Once the ESD event has passed, the Snap back device can automatically restore its normal state, allowing the circuit to resume normal operation.

Low power consumption: Snap back technology can protect circuits from ESD interference without consuming too much power.

Low cost: Snap back technology can be manufactured using standard semiconductor processes, making it relatively low-cost.

 In summary, Snap back technology is an efficient, reliable, and cost-effective ESD protection technology suitable for various electronic devices and application scenarios.

summary

The interface protection of electronic products requires the use of overvoltage protection devices. Many engineers are aware of the need to use protection devices, but due to improper selection or failure to follow the design principles of ESD circuit PCB, the product fails static or EMC testing, wastes manpower and financial resources, and causes product delays or over design, resulting in cost pressure. Leiditech Electronics provides customers with electromagnetic compatibility EMC design services, providing laboratory testing for free. We aim to efficiently and conveniently complete the design for our customers. We hope that more customers can quickly pass EMC's projects and improve product reliability as much as possible.

Shanghai Leiditech Electronic Electromagnetic Compatibility Laboratory provides free testing and peripheral electrostatic protection reference circuits.