Proton SEU test of MC68020, MC68882, TMS320C25 on the ARIANE 5 launcher on board computer (OBC) and inertial reference system (SRI)

Abstract

The ARIANE 5 on board computer (OBC) and Inertial Reference System (SRI) are based on Motorola MC68020 processor and MC68882 coprocessor. The SRI data acquisition board also uses the DSP TMS320C25 from Texas Instruments. These devices were characterized for proton induced SEUs. But representativeness of SEU test results on processors was questioned during ARIANE 5 studies. Protons test of these devices were also performed in the actual equipment with flight (or representative of) software. The results show that the OBC and the inertial reference system can satisfy the requirements of the ARIANE 5 missions.