Introduction

The KL3351 analog input terminal permits direct connection of a resistor bridge. The bridge voltage, U_D, and the supply voltage, U_REF, 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 = U_D / U_REF. Precise acquisition of the supply voltage along with the bridge voltage compensates for long-term and temperature drift.