Logic Powered Serial EEPROMs

PublishTime：2021-10-21

●Embedded applications increasingly want more integration and power, in less space for less cost. Using low power Serial EEPROMs (SEE) for application firmware, lookup tables, and microcode coupled with small footprints makes for permanent storage at respectable savings. One additional method of saving on the power budget is selectively powering off components when not needed, a basic for embedded power management. The low-power SEEs offered by Microchip Technology Inc., offer an additional benefit, powering the SEE from a microcontroller port. This allows the host controller to not only manipulate the Serial EEPROM Reads and Write, but also the periods when it is powered off or on. Satellite communications use this technique to save power and total dose accumulation. We call this technique POWER PORT. The microcontroller port must have sufficient Ioh (source current) to sustain the voltage and current for all memory functions, READ, ERASE, and WRITE. Obviously, not all memory or peripheral devices could be powered thusly, but Microchip’s SEE devices will function in this environment.
●The microcontroller, using its internal software and hardware decision functions, determines when it needs to communicate with the memory device, then acts accordingly. Any standard wake-up sequence will accomplish this task. The wake-up code needs only power up the memory and wait for the power to become stable before doing a read or write by driving the POWER PORT high. Then all serial communication executes normally. The SEEs are powered off for additional power savings and the data or code is utilized from RAM. Obviously, the port output must be allowed to settle, but normal operation of the output structures would guarantee that this would be met. The I/O port Tpd for the Microchip PIC16C5X, is specified at 40ns maximum.
●The 24LCXX and 93LCXX CMOS SEE series parts from Microchip were designed to achieve low current consumption across all ranges of operation.

Brand of Product：	Microchip
Part#：
Product Category：	Logic Powered Serial EEPROM More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	03/01/02
Version Number：
Data Encoding：	AN535;DS00535B
Data Size：	143 KB

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