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Operating 71M653X with external serial SRAM

Posted: 25 May 2011     Print Version  Bookmark and Share

Keywords:SRAM  RAM  memory space 

This document discusses the methods for extending the internal 4KB XRAM of the 71M653X energy metering ICs to a larger size. An external static memory IC may be connected to a 71M653X using its micro-wire interface. The external SRAM can be treated as an extra storage space outside the meter IC. Thus, internal bytes or blocks of bytes can be copied onto anywhere in the extended memory and read back.

This application scheme can be utilized to store demand logs or tables and other applications that require memory space larger than the space provided by the internal MPU RAM.

An even more interesting application is to use SRAM components with shadow RAM capabilities, such as the RAMTRON FM25H20. This type of IC is a commercially available memory that automatically transfers the RAM contents to a non-volatile memory portion on-chip as soon as the power supply is lost. Using such ICs can be beneficial since they require no MPU involvement for the process of saving billing and other data upon loss of the mains voltage.

View the PDF document for more information.

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