Introduction 1:

The KL3351 analog input terminal permits direct connection of a resistor bridge. The bridge voltage, UD, and the supply voltage, UREF, to the bridge are digitized with 16-bit resolution, and are transmitted along an electrically isolated channel to the higher-level automation device. The input channels are available in the form of two 16-bit values for further processing. The measurement result can be calculated from the formula: measured value = UD / UREF. Precise acquisition of the supply voltage along with the bridge voltage compensates for long-term and temperature drift.