UM-B-088: DA1453x/DA1458x Serial Port Service Reference Application
DA145xx
DA1453x is referring to DA14531-00, DA14531-01, DA14530 and DA14535
DA1458x is referring to DA14585 and DA14586.
DA14531
The DA14531-00 is the main DA14531 device. The -00 is just a new naming to introduce the variant DA14531-01. The DA14531-01 is a ROM variant of the main DA14531-00.
The DA14535 is a DA14531 upgrade.