SEMICONDUCTOR DEVICE THAT PERFORMS TEMPERATURE-BASED DATA WRITING OPERATION

A semiconductor device includes a substrate having a connector for connection with a host, a semiconductor memory device mounted on the substrate and including a plurality of memory cells, a temperature sensor mounted on the substrate, and a controller mounted on the substrate. The controller is configured to determine a number of bits per memory cell by which data are to be written in the semiconductor memory device, based on a temperature detected by the temperature sensor, and write the data in the semiconductor memory device by the determined number of bits per memory cell.