Using a discrete serial EEPROM for data and parameter storage can help simplify design while offering maximum upgrade flexibility. Limited memory package and density options have prevented taking full advantage of this approach in the most space-constrained applications, says ST, in presenting its automotive-qualified WFDFPN8 package at all densities from 2 kB to 512 kB. Both I²C and SPI serial interfaces are supported.
The WFDFPN8 outline has already proved popular in consumer-electronics applications, and ST has now created a rugged version capable of withstanding automotive environments. The devices have passed AEC-Q100 grade 0 reliability criteria tests and operate up to 125°C. Further advantages include 4 msec write time allowing fast parameter storage; clock frequency up to 20 MHz allowing rapid data exchanges; and built-in traceability and security features. These include a dedicated page for software identification and a write-lockable page to keep sensitive data secure.
Pricing is from $0.156 for the 2 kB M24C02-DRMF3TG/K with I²C interface (5000).