can i use PSoC4 as a supervisor IC. currently we are using TI's DS1314.
That can be performed as a functional equivalent, but the PSoC4 requires a larger current which will be drawn from the battery supply. Best would be to compare the actual DC data to see if it is tolerable for your application.
PSOC 4 can be put to sleep and wake up periodically while retaining internal SRAM
to achieve very low power. Further you may be able to design power supply with caps
to "hold up" system long enough while waiting for PSOC to wakeup and measure
power situation. Attached is a reference for determining cap sizes.
So you could control power switching and detection to an external SRAM as by
controlling PSOC sleep mode. These may help -
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http://www.cypress.com/?rID=78797 AN86233 - PSoC® 4 Low-Power Modes and Power Reduction Techniques
http://www.cypress.com/?rID=96072 AN90114 - PSoC® 4000 Family Low-Power System Design Techniques