SLIA097 March 2022 DRV5011 , DRV5011 , DRV5012 , DRV5012 , DRV5013 , DRV5013 , DRV5015 , DRV5015 , DRV5021 , DRV5021 , DRV5023 , DRV5023 , DRV5032 , DRV5032 , DRV5033 , DRV5033 , TMAG5110 , TMAG5110 , TMAG5111 , TMAG5111 , TMAG5123 , TMAG5123 , TMAG5231 , TMAG5231 , TMAG5328 , TMAG5328
Unipolar switches are the most simple Hall-effect device available, with sensing capability in one direction, either the North or South pole of a magnet, for BOP and BRP. When using sensors that have a unidirectional sensing direction, proper magnet orientation is required for B-field sensing. Common magnet implementations for Hall-effect switches include alternating North or South orientation magnets, or single orientation magnets spaced far enough apart to allow the B-field to fall below the BRP threshold between magnets. In digital Hall-effect devices, BOP and BRP dictate the switching thresholds for the device. For a Hall-effect switch, this characteristic makes the output duty cycle dependent on the magnetic threshold levels and magnet movement. Generally, more care must be taken to implement Hall-effect switches into a flow meter design compared to latches. However, switches can be used with various magnet implementations, further adding to flexibility in terms of flow meter mechanical design. Figure 2-3 displays the unipolar switch operation.