Waterproof ibutton key (TM1990) compatible with ds1990 ibutton

Product Name:  Waterproof ibutton key (TM1990) compatible with ds1990 ibutton Product Model: TM1990B-F5 Product Group: smart card--ibutton card       Features:   -Upgrade of DS1990 allows multiple Serial Number   -304-0.3 stainless steel package, durable, never rust and corrosion; resistance to heat; resistant variants   -can be read under water.   -Unique 64bit serial number,2401 chips,used universal.   -Low-cost electronic key for access control   -8-bit CRC for checking data integrity   -Can be read in less than 5 ms   -Operating temperature range of -40°C to  +85°C   -Chip-based data carrier compactly stores information.       Introduction of Ibutton card(TM1990 Card)
TM cards (commonly known as Pengpeng card or Button card, also known as iB card (iB is the abbreviation for iButton)) is a patented product of DALLAS Inc., U. S., which communicates with the reader through single line protocol and data read-writes are completed through an instant touch. The card is not only provided with operability of Contactless IC card, but also possesses low cost of Contact IC card, and is one of the best IC cards that has a fairly high cost performance.

The basic principles of Ibutton card(TM1990 Card):
-A TM card is similar to a button battery in shape and can be inlaid into a card, key button and other objects.
You can replace the data line, address line, control line and power line with a single line so that TM card achieves single line communication through a multi-function device. When the host is powered, TM card gives the response to the host through switching the impedances between 50Ω And 500, 000Ω . The lengths of time the signal is pulled down(long or short) show the digital logics(long=1, short=0). Due to the range of witching impedances is 1-10, 000, the resistances of the contact points will not affect the identification of the digital signals.
-According to whether the Memory in TM card is encrypted or not, TM card can be divided into encrypted TM card and non-encrypted TM card.
-Most of TM cards are non-encrypted.
-DS1991 card is an encrypted card which is divided into three separate encrypted sectors. Each encrypted sector has its own password and the three sectors can be respectively used for three separate purposes. DS1982 card is programmable.
TM card's encrypted method is different from Contactless IC Encrypted cards: The former has 64-bit password without the function of error calculation, while the latter has shorter password and the function of error calculation. If you forget your password by chance, you can reuse your TM card after re-initializing it, but the information in your card will be automatically rewritten.       Application:   Widely used in security patrol,keys for cabinet locks,electronic rim locks,door intercom, card systems, identification, banking, Communications, rail transportation, transportation, and so on.        Sample policy:   We could offer 3-5pcs samples for free.        Delivery:   Sample:1-3days   Order:3-10days       Packing:   Neutral packing.100pcs/box,5000pcs/ctn,GW:25kg,volume 0.055CBM.       Smart card types we produce: 
TM card: DS1990A, RW1990, DS1991, DS1971, DS1963...
RFID card, EM4100, EM4305, T5567 / T5577,             Company profile ZHONGSHAN JIEAN ELECTRONIC TECHNOLOGY CO.,LTD (SELOCKEY®)                was set up in 2000 in Guangdong province. From now on, SELOCKEY® has gained a vast development with its powerful technology and business trade. With its humanistic management, SELOCKEY® is trying to create a comfortable working environment, which provides a platform for every staff to develop themselves and grow up together. Due to its humanism, our company tries to make sure that our product can meet customers' need and be more satisfied with our service. Our tenet is "The Best Quality, The Best Process".        SELOCKEY® is a R&D MANUFACTURER, specializing in TM/IC/ID card (such as contact card, electronic keys, and touch memory keys) EM4100,T5577,T5567,T5557 smart cards, and electronic cabinet locks, electronic door locks, magnetic locks, access control system and related products.  Major products gained high reputation in Russia, South America, and Western Europe. And we are devoted ourselves to offering high-quality product and best service for you.       Company View:     Professional Machines:           Welcome to send us an inquiry, We will reply to you within three working hours!