VN820SO-E STMICROELECTRONICS [STMicroelectronics], VN820SO-E Datasheet - Page 10

• Manufacturer Part Number: VN820SO-E
• Description: HIGH SIDE DRIVER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

VN820-E / VN820SO-E / VN820SP-E / VN820B5-E / VN820PT-E
OPEN LOAD DETECTION IN OFF STATE
Off state open load detection requires an external pull-up
resistor (R
positive supply voltage (V
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:
Figure 9. Open Load detection in off state
10/38
in this case we have to avoid V
V
Olmin
; this results in the following condition
PU
) connected between OUTPUT pin and a
STATUS
INPUT
PU
) like the +5V line used to
OUT
to be higher than
DRIVER
LOGIC
+
GROUND
+
-
V
V
CC
OL
V batt.
R
2) no misdetection when load is disconnected: in this
Because I
pulled high (up to several mA), the pull-up resistor R
should be connected to a supply that is switched OFF
when the module is in standby.
The values of V
the Electrical Characteristics section.
case the V
results in the following condition R
I
V
L(off2)
OUT
=(V
.
OUT
s(OFF)
PU
/(R
OUT
I
OLmin
L(off2)
L
may significantly increase if V
+R
has to be higher than V
, V
PU
))R
OLmax
V
L
PU
<V
and I
Olmin.
R
R
PU
L
L(off2)
PU
<(V
are available in
PU–
OLmax
V
OLmax
out
; this
PU
is
)/