Will the ADT7310/ADT7320 work if the /CS pin is always set low?
The ADT7310/ADT7320 will work with /CS always set low. The main disadvantage of this configuration is that the possibility of addressing devices on the SPI bus is eliminated. This means that the SPI bus used to communicate with the temperature sensor cannot accept any SPI compatible device connected to its lines directly. To have multiple SPI devices on the bus, the only solution is to use a multiplexer between the Dout pin of each device and the Dout bus line so that only one device can be addressed at any one time.