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This small signal diode can be safely shared amongst several different HSD. Also in this case, the presence of the ground network will produce a shift (j 600mV) in the input threshold and the status output values if the mccroprocessor ground is not common with the device ground. This shift will not vary if more than one HSD shares the same diode/resistor network. LOAD DUMP PROTECTION Dld is necessary (Transil or MOV) if the load dump peak voltage exceeds Vcc max DC rating. The same applies if the device will be subject to transients on the Vcc line that are greater than the ones shown in the ISO T/R 7637/1 to ble. ccC l/Os PROTECTION: If a ground protection network is used and negative transients are present on the Vcc line, the be pulled negative. ST suggests to inse:C:;:_:rOg~strstl l'(Rp:") in line to prevent the ~C l/Os pins to latch- The value ofthese resistors is a compromise between the leakage current of ~C and the current required by the HSD l/Os (Input levels compatibility) with the latch-up limit of ccC l/Os. -VCCpeak/llatchup " Rprot " (VOH C-VIH-VGND)/ IIHmax Calculation example: For VCCpeak= - 100V and liatcriup > 20mA; VOH C > 4.5V 5kl " Rprot " 65kl. Recommended Rprot value is 10kl .