The DS1920-F5+ iButton only has scratchpad memory that displays the latest temperature reading. It does not have the capability to log historical data. To address the requirement for an iButton that logs temperature data with timestamps and works with the DS9490B USB adapter, recommend the following models: DS1921, DS1922, and DS1925. These models have the capability to record temperature data along with timestamps and are compatible with the DS9490B USB adapter.