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E~2PROM(电可擦写存储器)可在线修改数据,并可长期保存数据而不受掉电的影响,因此可用于保存用户资料和各种现场参数及定值等。但是,由于并行存取 E~2PROM 存在引脚多、封装尺寸大等缺点,使得部分设计者宁愿采取电池(或电容)加 RAM 的方法来存储参数。随着微电子技术的发展,新型串行 E~2PROM应运而生,给设计者带来了极大的便利。按存储器数据传送方式来分,主要存在3种具代表性的串行总线格式,即I~2C、SPI 和 MPS 格式。
E ~ 2PROM (Electrically Erasable and Writable Memory) can modify data online and can save the data for a long time without being affected by the power failure, so it can be used to save user’s data and various field parameters and settings. However, due to the existence of parallel access E ~ 2PROM many pins, large package size and other shortcomings, making some designers would rather take the battery (or capacitor) plus RAM method to store parameters. With the development of microelectronic technology, a new type of serial E ~ 2PROM came into being, bringing great convenience to designers. According to the memory data transfer method to points, there are three main representative of the serial bus format, that is, I ~ 2C, SPI and MPS format.