In case, you have no other income apart from interest income, in order to avoid TDS, you can submit a declaration under Section 197A of the Income Tax Act in Form 15-G (for general or non-senior citizens) or
Form 15-H (for senior citizens), as applicable.
Furthermore, in order to avoid TDS, split your bank FDs across branches of the Bank. Splitting bank FDs will also enable you to address your liquidity needs.