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AN1596 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN1596
Description  Today?셲 automotive market requires a continuous increasing
PDF  24 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1596 Datasheet(HTML) 22 Page - STMicroelectronics

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AN1596 - APPLICATION NOTE
4)
Off-state
open load
detection in
analog HSDs
R1, R2,
R3, R4,
T1, T2, T3,
T4
See point 3 - When open
load event occurs a voltage
of about 5V appears on CS
pin.
5)
Current
sensing
(VN60, VN61,
VN92, VNC6
lines)
Rsense
Choose Rsense in order to
match Vsense with the micro
analogic INPUT:
Vsense=Rsense IOUT /K (see
K parameter in datasheets)
6)
Ground
potential
differences
(case 1)
R1, D2
VIL and VIH shifted by
(VSS2–VSS1). R1 prevents
the microcontroller to latch
up, by limiting the input
current
under
micro
threshold current Ilu.
R1 > -Vccpeak/Ilu
R1 < (VoutµC – VIH –0.6V)/IIN
7)
Ground
potential
differences
(case 2)
R2, D2
In fault conditions the device
pulls the status pin down to
VSS2 and the microcontroller
sees a negative voltage –
(VSS1–VSS2).
Risk
of
microcontroller latch up: add
R2
to
limit
the
current.
Undervoltage and offstate
open load levels are not
shifted.
GND
V CC.
Vpu
R pu
RL
T1
T2
µ P
DRIVER
+
LOGIC
IN
R1
R2
Rsense
CS
+ 5V
T3
T4
R3
R4
OUT
DRIVE
+
LOGIC
INPUT
VCC
V
OUT
R1
R2
Rsense
CS
GND
+
-
VN
µC
REGUL
BATT
VSS1
VSS2
LOAD
D2
R1
VN
µC
REGUL
BATT
VSS1
VSS2
LOAD
D2
R2



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