Abstract

This application note discusses how the TMAG5328 resistor and voltage adjustable, low-power Hall-effect switch can increase system design flexibility and reduce design time. In addition, the document also discusses how using voltage to adjust the TMAG5328’s B_OP enables multiple applications. One of these applications is a software programmable Hall-effect switch with microcontroller-less standalone mode, which is done by using a DAC or digital potentiometer with nonvolatile memory. Additionally, the document discusses how sweeping the voltage that sets the B_OP can be used to back-calculate the sensed magnetic flux density seen by the TMAG5328. This document also discusses how adding a square wave voltage waveform can help the TMAG5328 implement diagnostics for detecting faults such as TMAG5328 device pin shorts, TMAG5328 device pin disconnections, and when a system’s magnet is either too close or too far from the sensor. The magnet out-of-range functionality implemented for diagnostics can also be reused as a magnetic window comparator instead.