Application diagram

Anti-battery ground protection network solution 1: Resistor in ground wire (RGND only). This can be used for any type of load Here are instructions on how to size the rgnd resistor. 1) RGND is less than 600MV/IS(ON) max 2) RGND±(VCC)/(-IGND), where -IGND is the DC reverse ground pin current and can be found in the Absolute Maximum Ratings section of the device's datasheet turn up. The power dissipation in rgnd (when vcc<0: in reverse battery case) is: pd=(-vcc)2/rgnd This resistor can be shared among several different hsds. Note that this resistor value should be calculated using equation (1), where (on)max becomes the sum of the maximum on-state currents of the different devices. Note that if the microprocessor ground is not shared with the device ground, then rgnd will produce a shift (is(on) max * rgnd) in the input threshold and state output values. In the case of multiple high-side drivers sharing the same RGND, this shift will vary based on the number of devices.
If the calculated power dissipation results in a large resistor or multiple devices must share the same resistor, ST recommends using Solution 2 (see below) Solution 2: Diode in Ground (DGND). If the device will be driving an inductive load, a resistor (RGND = 1kΩ) should be inserted in parallel with DGND. This small signal diode can be safely shared among several different high-speed drivers. Also in this case, if the microprocessor ground is not shared with the device ground, the presence of the ground network will create a shift (j600mV) in the input threshold and state output value if multiple HSDs share the same diode/resistor network , the offset does not change. Series resistors on the input and status lines are also required to prevent currents exceeding the absolute maximum ratings during battery voltage transients. For unused input and status pins, the safest configuration is to leave them unconnected. If the load dump peak voltage exceeds the VCC maximum DC rating, a load dump protection DLD (voltage transient suppressor) is required. The same applies if the device is exposed to transients on the VCC line greater than those shown in the ISO T/R 7637/1 table.

μC I/O Protection: If a ground protection network is used, and there is a negative transient on the VCC line, the control pin will be pulled negative. ST It is recommended to insert a resistor (RPROT) in the line to prevent the μC I/O from causing Foot lock. The values of these resistors are a compromise between the leakage current of μC and the current required by HSD I/Os (input level compatibility) (latch limited to μC I/Os) - vcpeak/Ilatchup≤Rprot≤(VOHμC-VIH- VGND)/IIHmax calculation example: For vcpeak=- 100V and Ilatchup≥20mA; VOHμC≥4.5V 5kΩ≤Rprot≤65kΩ The recommended Rprot value is 10kΩ.
Open Load Detection in OFF State Open load detection in OFF state requires an output pin and a positive supply voltage (VPU) such as the +5V line used to power a microprocessor. The external resistor must be selected according to the following requirements: 1) No false open load indication when connecting the load: In this case, we must avoid VOUT being higher than VOLmin; this will result in the following condition VOUT=(VPU/(RL+RPU))RL