Solution
Class 1 TEDS Sensor:In Class 1 sensors, the digital signal is shared with the analog signal on the same lines and it is multiplexed based on the biasing of the sensor. The sensor includes the TEDS EEPROM and the circuitry for switching based on bias direction, which is usually only a resistor and a diode or two. Figure 1 illustrates this configuration.
Class 2 TEDS Sensor:In Class 2 sensors, the TEDS EEPROM and analog signal use independent lines to transfer data. Due to the separate lines, no switching is needed because the digital TEDS signal and analog measurement are sent separately. Figure 2 illustrates this configuration.