Feature TM card also known as touch memory electronic keyStainless steel package with su304 rugged never rust corrosion resistant to heat Anti variant sealing strong for security patrol sauna door locks electronic door locks door intercom card systems identification banking Communications rail transportation transportation and so many fieldsInformation ibutton RW1990 memory 64 can be repeated rubbing write the diy code RW1990 feature 1 RW1990 ibutton2 Low cost3 water proof4 Rewritable DS1990A and TM1990A iButton 5 can be copy RW1990Technique Parameters America DALLAS encryptionBreakdown Rate 1 100 000Serial Number Only global 64 bit numbersSystem Logic 64bits pin protectionMemory 8kb RAMInductive Type touchR W and encryptR W times 1 500 000 000Working Temperature 40 85Rewritable ibutton RW1990A F5 read write type of card compatible ds1990a Rewritable DS1990A and TM1990A iButton RW1990Unique 64 bit registration Number The data exchange is performed by the protocol 1 Wire which requires one sole data pin and the common pin The microcircuit supports the function of the protocol 1 Wire of ROM search which makes it possible for several devices to operate on one bus This protocol determines the alteration conditions of the bus statusand the time intervals during synchronization by the synchropulses cuts of the control device Data readout and writing are performed by the junior significant bit forward Built In Multidrop Controller for 1 Wire Net Digital ident