ZHCSQR8A March 2023 – December 2023 TMAG5170D-Q1
PRODUCTION DATA
This diagnostic mechanism allows the controller to check any hardware fault with the internal oscillator. With this check, any drift of internal oscillators can be checked. The high-frequency oscillator is critical for precision measurement of the magnetic field and low-power oscillator is critical to control wake-up and sleep mode and other state machine control.
To run this check, external software code on the controller is required. The controller must instate the check by setting the OSC_CNT_CTL bits to select a particular oscillator and start the internal count on the device. At the same time, the controller also starts a counter using its own timebase. After a predetermined time, the controller issues a stop to the oscillator count by setting OSC_CNT_CTL = 03h and read the OSC_COUNT. The read value of the OSC_COUNT should not exceed the value based off maximum fHFOSC, fLFPOSC in the specification section. Consider the variation of controller speed and SPI communication when calculating the error margin for the OSC_COUNT.
| Run Mode | On-demand as run by the external controller |
| Data Sheet Parameter(s) | fHFOSC, fLFPOSC |
| Configuration Register(s) | OSC_CNT_CTL |
| Fault Register Bit | OSC_COUNT |
| Impact if disabled | If the controller decides not to run this test, then any drift of HF oscillator can impact the accuracy of the reported sensor data |