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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9779WD датащи(PDF) 108 Page - STMicroelectronics |
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L9779WD датащи(HTML) 108 Page - STMicroelectronics |
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108 / 170 page  Functional description L9779WD 108/170 DocID027452 Rev 5 6.16.4 Diagnosis test After the request of diagnosis by MSC, the diagnosis routine tests the sensor presence or vacancy and the short circuit to GND or Vbat. When the system is in diagnosis status the flying wheel interface function doesn't operate. The diagnosis procedure has an operation time of about min 5 ms due to the external transient. The result of diagnosis routine is valid only if the engine is switched off and if the sensor is a variable reluctance sensor. In the last operation of the diagnosis protocol writes the diagnosis result in VRSdiag bit and writes the operative status in VRSstatus bit. If a new request is sent the new value is overwritten. Figure 72. Diagnosis test diagram Table 48. Diagnosis test electrical characteristics Pin Symbol Parameter Test condition Min Typ Max Unit VrsP VrsM ViThL Input high-to-low differential threshold voltage --50 0 50 mV VCM Common mode operating range Not to be tested. It is an application note. 01.653 V VclpH Input high clamping voltage |VRS_INP| = |VRS_INM| = 20 mA 3.3 -0.3 - 3.3 +0.3 V VclpL Input low clamping voltage |VRS_INP| = |VRS_INM| = 20 mA -1.5 - -0.3 V Vopenload Output open load voltage VRS_INP = VRS_INM Vopenload Mode R enabled 1.5 (3.3) /2 1.8 V |
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