The PTCM-4×5×6 type IC card holder anti-attack thermistor module is another important application field of PTC thermistor. The application of this type of thermistor module in the anti-attack of the IC card holder greatly improves the anti-attack capability of the IC card reader and other related products, so that it can withstand external static electricity, strong electricity, and accidental short circuit. Wait for various attacks. The basic principle is as shown in the figure below: Under the normal read and write state of the IC card, the PTC thermistor is equivalent to the current limiting resistor connected in series, and the resistance does not change. In the abnormal state, the current flowing through the PTC thermistor is directly or indirectly increased, and the resistance value thereof changes stepwise, and rises by 4-5 orders of magnitude to be in an off state, thereby achieving the protection purpose.
First, the application circuit
Note: CPU card or memory card can choose four groups, five groups or six groups of PTC modules according to the actual situation.
Second, the recommended settings:
In order to further improve the protection effect of your meter in anti-static, it is recommended that you set the peripheral circuit and circuit layout of this IC card anti-attack module as follows:
1. A magnetic bead is connected in parallel with the 4148 switch tube between the GND of the card holder and the GND of the anti-attack module.
2. A 50Ω?W wirewound resistor is placed between VCC and the VCC pin 1 of the attack module.
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