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AS5171 Datasheet(PDF) 25 Page - ams AG |
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AS5171 Datasheet(HTML) 25 Page - ams AG |
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25 / 42 page  ams Datasheet Page 25 [v1-01] 2016-Feb-17 Document Feedback AS5171 − Register Description The FBS setting allows selecting the failure band (lower or upper) when the output goes into diagnostic mode. Diagnostic Explanations For a detailed explanation of the diagnostic and the SPFM please contact the ams application team for magnetic position sensor. Analog Read Fail (SM11) This safety mechanism operates differently for AS5171A (analog) and AS5171B (digital): • For AS5171B readout failure: After a falling edge there must be a rising edge after a defined time. In case this is not respected output driver is kept in high impedance. After a certain time this condition is checked again. The readout mechanism for AS5171B is defined by PWMRTH and PWMFTH, which set the maximum timeout period to wait for a falling/rising before triggering an error condition, according to the figures below. Figure 32: PWMRTH Conditions SM8 VDD undervoltage Yes, if the VDD is above the specified threshold Hi-z: Failure band related to the out load SM9 Broken VDD Yes Hi-z: Failure band related to the out load SM10 ADC check No, sensor stays in failure band till the Sensor is resetting. Hi-z: Failure band related to the out load SM11 Analog read fail Yes Hi-z: Failure band related to the out load SM12 Short circuit Yes Hi-z: Failure band related to the out load SM13 Signature No, sensor stays in failure band till the sensor is resetting Hi-z: Failure band related to the out load SM14 Broken GND Yes Hi-z: Failure band related to the out load PWMRTH Delay ( μs) 0 0 PWM Read Back rise disabled 01 24-28 10 56-60 1 1 112-120 SM Safety Mechanism Recoverable Safe State |
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