Overview
The FM3127x and FM31L27x product families offer Integrated Processor Companion, Real Time Clock (RTC), and F-RAM memory. The processor companion comprises a power-on system reset, low-voltage detect, automatic switchover to backup power, a watchdog timer, an early power fail warning, two event counters, and a lockable 64-bit serial number. They employ an I2C interface to access the memory, the processor companion, and the RTC. FM3127x and FM31L27x devices are available in 64-Kbit and 256-Kbit densities. The “L” family offers supply voltage operation from 2.7 V to 3.6 V, and the standard family offers supply voltage operation from 4.0 V to 5.5 V.
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AN407 - A Design Guide to I2C F-RAM Processor Companions – FM31278, FM31276, FM31L278, and FM31L276
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