This article mainly introduces the automatic identification chip of the American DALLAS company. This chip can communicate with the microprocessor through a one-line protocol, is simple to read and write, and has high reliability. The article briefly introduces its working principle and applies it to the home intelligent alarm system. Keywords: One-line protocol Time slice Intelligent alarm system Contact memory is an automatic identification chip produced by the American DALLAS company. It is packaged in a stainless steel shell, with a simple reading and writing device, only one data line and one ground line, and can complete the transmission of commands and data through a one-line protocol. Compared with IC cards and magnetic cards, it is simple to read and write, has high reliability, has networking functions, is more suitable for operation in harsh environments, and has a wider range of uses. It has a relatively complete product range, and the storage capacity can range from 0 to 64K bytes.
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