Hello,
By scoring  89% you are likely to get admission in ECE at Amrita University, but the campus and fee slab you select also matter. The Coimbatore campus is the most competitive, so the ECE cutoff has been trending in the range of 84 to 93%, hence your admission chances are decent but not guaranteed for the top slab. On the other hand, the cutoff at the Amritapuri and Bengaluru campuses is slightly lower, at 75-90%, which makes for a perfect ECE location there. Moreover, your chances will improve if you fall under the home state quota.

So yes, you can have a call for ECE at Amrita, mainly at campuses other than Coimbatore, but it is better to be prepared with some backup options.