FRAM memory designed into DSP-based digital car audio system for Renault Samsung Motors

Daesung-Eltec, a leader in car audio/video and digital multimedia systems, designed the DSP-based audio platform for use in Renault Samsung Motors vehicles. They selected FRAM memory due to its write speed, which is fast enough to reduce backup time and, therefore, eliminate the need for an onboard capacitor to manage power down events. This is bolstered by FRAM’s high endurance, which enables the system to write data in real time without any fear of wearing out the memory.



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.