M1 card overview
The so-called M1 chip, refers to the subsidiary of NXP Philips subsidiary chip abbreviation, full name NXP Mifare1 series, commonly used two models S50 and S70, as of November 4, 2013, already have a domestic chip with its Compatible with the use of PVC package M1 chip, sensor antenna, and then suppress the formation of the card is the smart card industry said M1 card, a non-contact IC card. Non-contact IC card, also known as radio frequency card, successfully solve the passive (card no power) and contact-free this problem is a major breakthrough in the field of electronic devices. Mainly used for bus, ferry, subway automatic toll collection system, also used in access control, identification and e-wallet.
M1 card, the advantage is read-write multi-function card, the disadvantage is: the price is slightly expensive, short induction distance, suitable for non-fixed consumption systems, parking systems, access control systems such as attendance.
M1 card working principle editor
To the M1 card to send a fixed frequency electromagnetic waves, the card has a LC series resonant circuit, the frequency and the reader to send the same frequency, the excitation of the electromagnetic wave, LC resonant circuit resonance, so that there is a charge in the capacitor , The other end of this capacitor, connected with a one-way conduction of the electronic pump, the charge within the capacitor to another capacitor storage, when the accumulated charge reaches 2V, this capacitor can be used as a power supply for other circuits Voltage, the card data transmitted out or access to the reader data.