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AN1596 Datasheet(PDF) 21 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) 21 Page - STMicroelectronics

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AN1596 - APPLICATION NOTE
APPENDIX
Symptom
Component
Schematic
Notes
1)
Input and
Status pins
R1, R2, Rpu
R1, R2 and Rpu chosen in
order to limit the control pins
currents to 10mA.
R1 and R2 must protect the
microcontroller against the
latch-up (see point 6, 7).
2)
Off-State open
load detection
in digital HSDs
(case 1)
Rpu
Choose Rpu in order not to
have
false
open
load
detection:
VOUT=(Vpu/(RL+Rpu))•
RL<VOLmin
Choose
Rpu
to
assure
detection
when
load
is
disconnected:
Rpu<(Vpu–VOLmax)/IL(off2)
VOLmin, VOLmax, IL(off2) are
given in datasheets.
3)
Off-State open
load detection
in digital HSDs
(case 2)
Rpu, R1, R2,
T1, T2
To
minimize
power
consumption,
the
microcontroller
can
periodically switch on T1
and T2 when the ignition key
is inserted.
DRIVER
+
LOGIC
INPUT
STATUS
VCC
V
OUT
R1
R2
GND
+ 5V
Rpu
LOAD
V OL
Vpu
R pu
RL
10k
Ω
DRIVER
+
LOGIC
+
-
INPUT
STATUS
VOUT
GROUND
VCC
IL(off2)
VOL
V CC.
Vpu
R pu
RL
10k
Ω
DRIVER
+
LOGIC
+
-
INPUT
STATUS
V CC
VOUT
GROUND
T1
T2
µ P
R2
R1



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