Jiujiang card making/Jiujiang card making manufacturer/Jiujiang professional card making

Contactless card
One main indicator
Capacity is bits
Divided into sectors, each sector is a block, each block is a byte, and blocks are accessed Unit
Each sector has an independent set of passwords and access control
Each card has a unique serial number, which is a bit
Has an anti-collision mechanism and supports multi-card operation
None Power supply, comes with antenna, contains encrypted control logic and communication logic circuit
Data retention period is one year, can be rewritten ten thousand times, and read unlimited times
Working temperature ℃~℃ humidity
Working frequency
Communication rate
The reading and writing distance is related to the reader
Two working principles
The electrical part of the card only consists of an antenna and an antenna.
The antenna of the antenna card is a coil with only a few groups of windings, which is very suitable for packaging into the card.
The card consists of a high-speed baud rate interface, a control unit and a bit
.
Working Principle
The reader sends a set of fixed-frequency electromagnetic waves to the card. There is a series resonance circuit in the card. Its frequency is the same as the frequency emitted by the reader. Under the excitation of the electromagnetic waves, the resonance circuit Resonance is generated, so that there is charge in the capacitor. At the other end of the capacitor, there is a unidirectional electron pump, which sends the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches It can be used as a power supply to provide operating voltage for other circuits, transmit data in the card or receive data from the reader/writer.