SBAS934A June 2020 – December 2021 TMAG5170-Q1
PRODUCTION DATA
This diagnostic mechanism allows the controller to check the performance of the analog signal path. In this check, the device disconnects the Hall sensor from the signal path and uses an alternate resistance bridge to create a known, predetermined signal as an input to the signal path. This mechanism then checks if the measured digital value compared to a fixed value from the factory is within a pre-programmed, factory-determined value. This mechanism can detect issues with multiplexers, offset cancellation mechanism, the gain stages, the low-pass filter, and the ADC, as well.
To run this check, the controller must enable the check and set the scheduling for the run. During this check, the AFE is not available for magnetic field conversion. The user can configure the ALERT pin to toggle if an error is detected. This error is also reported in the user register.
Run Mode | Every time a magnetic measurement is initiated and completed |
Configuration Register(s) | DIAG_EN to enable test. DIAG_SEL to schedule when the test is run |
Fault Register Bit | SENS_STAT |
Impact if disabled | If disabled, any failures or drift with the analog front-end signal path may not be detected. |