VNQ810M-E View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

VNQ810M-E

QUAD CHANNEL HIGH SIDE DRIVER

STMicroelectronics 

VNQ810M-E

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.

Series resistor in INPUT and STATUS lines are also

required to prevent that, during battery voltage transient,

the current exceeds the Absolute Maximum Rating.

Safest configuration for unused INPUT and STATUS pin

is to leave them unconnected.

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

5kΩ ≤ Rprot ≤ 65kΩ.

Recommended Rprot value is 10kΩ.

OPEN LOAD DETECTION IN OFF STATE

Off state open load detection requires an external pull-up

resistor (RPU) connected between OUTPUT pin and a

positive supply voltage (VPU) like the +5V line used to

supply the microprocessor.

The external resistor has to be selected according to the

following requirements:

1) no false open load indication when load is connected:

in this case we have to avoid VOUT to be higher than

VOlmin; this results in the following condition

VOUT=(VPU/(RL+RPU))RL<VOlmin.

2) no misdetection when load is disconnected: in this

case the VOUT has to be higher than VOLmax; this

results in the following condition RPU<(VPU–VOLmax)/

IL(off2).

Because Is(OFF) may significantly increase if Vout is

pulled high (up to several mA), the pull-up resistor RPU

should be connected to a supply that is switched OFF

when the module is in standby.

The values of VOLmin, VOLmax and IL(off2) are available in

the Electrical Characteristics section.

Figure 9. Open Load detection in off state

INPUT

STATUS

V batt.

VPU

VCC

RPU

DRIVER

+

LOGIC

IL(off2)

+

R

-

OUT

VOL

RL

GROUND

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