This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the translocation of calcium from the cytosol out of the cell, into the endoplasmic reticulum, or into organelles (By similarity). Involved in salt and drought stress tolerance (PubMed:24128296). Involved in cold stress tolerance (PubMed:24992889). ATP + Ca(2+)(in) + H2O = ADP + Ca(2+)(out) + H(+) + phosphate Activated by calmodulin. Interacts with NOH1. Induced by salt, drought and heat stresses, and abscisic acid (ABA). The N-terminus contains an autoinhibitory calmodulin-binding domain, which binds calmodulin in a calcium-dependent fashion. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IIB subfamily.