FRAM memory designed into DSP-based digital car audio system for Renault Samsung Motors
Ramtron International has announced that Daesung-Eltec Co. Ltd. of Korea has designed FRAM memory into its new digital signal processing (DSP)-based car audio platform. Daesung-Eltec selected the FM24C64 - a 64-kilobit FRAM with 2-wire serial interface – to enable sophisticated memory functions such as storing audio, channel and favourite artist/song settings, as well as the resume play and the favourite artist/song alert features. FRAM’s non-volatility, No Delay writes, virtually limitless endurance, small footprint and cost effectiveness make it the ideal memory technology for advanced digital automotive audio systems.Daes
Digital radio has transformed the car radio from a simple audio processor to a sophisticated infotainment system, with enhanced CD-like audio quality, superior signal reception, and pioneering memory functions. In such systems, the FM24C64 is integral for saving DSP filter configurations and settings so that users can recall from a selection of preferred audio settings. Ramtron’s FRAM also stores favourite radio stations and artist and song names so that users can program the receiver to send an alert when a favourite song/artist is played on any radio channel.
Advanced car audio platforms download and store information in non-volatile memory. The uncertainty of the frequency of changes in this information makes it risky to use a non-volatile memory with limited endurance, such as EEPROM. A common workaround is to maintain the downloaded information in RAM and write it to the EEPROM when power is turned off. This method requires a large capacitor to maintain power while the system writes data to the EEPROM.
While inexpensive, capacitors are physically bulky and undesirable in ever-shrinking electronic radios. FRAM memory is a simpler solution that can be written to an unlimited number of times and can store information instantly upon power down without a complicated work around. Daesung-Eltec designed the 64Kb FRAM into its automotive audio system to save system board space and time to market as well to guarantee data integrity.