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VND5E050MCJTR-E Datasheet(PDF) 23 Page - STMicroelectronics |
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VND5E050MCJTR-E Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 40 page  VND5E050MCJ-E, VND5E050MCK-E Application information Doc ID 022514 Rev 2 23/40 This resistor can be shared amongst several different HSDs. Please note that the value of this resistor should be calculated with formula (1) where IS(on)max becomes the sum of the maximum on-state currents of the different devices. Please note that if the microprocessor ground is not shared by the device ground then the RGND produces a shift (IS(on)max * RGND) in the input thresholds and the status output values. This shift varies depending on how many devices are on in case of several high-side drivers sharing the same RGND. If the calculated power dissipation leads to a large resistor or several devices have to share the same resistor then ST suggests to utilize Solution 2 (see Section 3.1.2). 3.1.2 Solution 2: diode (DGND) in the ground line A resistor (RGND = 1 kshould be inserted in parallel to DGND if the device drives an inductive load. This small signal diode can be safely shared amongst several different HSDs. Also in this case, the presence of the ground network produces a shift ( 600 mV) in the input threshold and in the status output values if the microprocessor ground is not common to the device ground. This shift not varies if more than one HSD share the same diode/resistor network. 3.2 Load dump protection Dld is necessary (voltage transient suppressor) if the load dump peak voltage exceeds the VCC maximum DC rating. The same applies if the device is subject to transients on the VCC line that are greater than the ones shown in the ISO 7637-2: 2004(E) table. 3.3 MCU I/Os protection If a ground protection network is used and negative transients are present on the VCC line, the control pins are pulled negative. ST suggests to insert a resistor (Rprot) in line to prevent the microcontroller I/O pins from latching-up. The value of these resistors is a compromise between the leakage current of microcontroller and the current required by the HSD I/Os (Input levels compatibility) with the latch-up limit of microcontroller I/Os: Equation 2 -VCCpeak / Ilatchup Rprot (VOHC - VIH - VGND) / IIHmax Calculation example: For VCCpeak = - 100 V, Ilatchup 20 mA and VOHµC 4.5 V 5 k R prot 180 k Recommended values: Rprot =10 k, CEXT = 10 nF. |
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