VND5050AKE STMICRO, VND5050AKE Datasheet - Page 22

• Manufacturer Part Number: VND5050AKE
• Manufacturer: STMICRO

Application information
3.1.2
3.2
3.3
22/37
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 below).
Solution 2: diode (D
A resistor (R
inductive load.
This small signal diode can be safely shared amongst several different HSDs. Also in this
case, the presence of the ground network will produce a shift (≈600mV) in the input
threshold and in the status output values if the microprocessor ground is not common to the
device ground. This shift will not vary if more than one HSD shares the same diode/resistor
network.
Load dump protection
D
V
that are greater than the ones shown in the ISO 7637-2: 2004(E) table.
Microcontroller I/Os protection
If a ground protection network is used and negative transient are present on the V
the control pins will be pulled negative. ST suggests to insert a resistor (R
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.
-V
Calculation example:
For V
5kΩ ≤ R
Recommended values: R
CC
ld
CCpeak
is necessary (Voltage Transient Suppressor) if the load dump peak voltage exceeds the
max DC rating. The same applies if the device is subject to transients on the V
CCpeak
prot
/I
latchup
= - 100V and I
≤ 180kΩ.
GND
=1kΩ) should be inserted in parallel to D
≤ R
prot
≤ (V
prot
GND
latchup
OHμC
=10kΩ, C
) in the ground line
Doc ID 12272 Rev 9
-V
≥ 20mA; V
IH
-V
EXT
GND
=10nF.
) / I
OHµC
IHmax
≥ 4.5V
GND
VND5050AJ-E / VND5050AK-E
if the device drives an
prot
) in line to
CC
CC
line,
line