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VNQ830M13TR Datasheet(PDF) 10 Page - STMicroelectronics |
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VNQ830M13TR Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 20 page  10/20 VNQ830M Solution 2: A diode (DGND) in the ground line. A resistor (RGND=1kΩ) should be inserted in parallel to DGND if the device will be driving an inductive load. 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 ( j600mV) in the input threshold and the status output values if the microprocessor 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 (Voltage Transient Suppressor) 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 table. µC I/Os PROTECTION: If a ground protection network is used and negative transients are present on the VCC line, the control pins will be pulled negative. ST suggests to insert a resistor (Rprot) in line to prevent the µC I/Os pins to latch-up. The value of these resistors is a compromise between the leakage current of µC and the current required by the HSD I/Os (Input levels compatibility) with the latch-up limit of µC I/Os. -VCCpeak/Ilatchup ≤ Rprot ≤ (VOHµC-VIH-VGND) / IIHmax Calculation example: For VCCpeak= - 100V and Ilatchup ≥ 20mA; VOHµC ≥ 4.5V 5k Ω ≤ R prot ≤ 65kΩ. Recommended Rprot value is 10kΩ. |
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