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The diagnostic function drives the DIAG terminal High or Low in the event of an abnormal condition being detected.
It signals an abnormal condition when overcurrent protection,thermal shutdown, or open-load detection (i.e., high-impedance output) is tripped. It is possible to identify an abnormal condition in an IPD by processing the input and diagnostic output signals with a microcontroller or a logic circuit.
|Operating Mode||Input Signal VIN||Output Voltage
|Output MOSFET State||Diagnostic Output VDIAG||Note|
|Shorted load / short to ground (overcurrent condition)||L||L||Off||L||It is possible to determine whether an IPD has a shorted load (overcurrent condition) or a thermal shutdown condition by processing the input and diagnostic output signals with a microcontroller or a logic circuit.|
|H||L||On (current limited)||L|
|Thermal shutdown condition||L||L||Off||L|
|Open load / broken wire||L||H||Off||H||-|