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L9788 Datasheet(PDF) 110 Page - STMicroelectronics

Part # L9788
Description  Multifunction IC for automotive engine management system
PDF  264 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9788 Datasheet(HTML) 110 Page - STMicroelectronics

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High/low-side drivers - STARTER STR[1:3]
L9788
110/264
DS12308 Rev 4
Figure 42. OFF state diagnostic HS config
Figure 43. High-side driver OFF state fast pull down current behavior
By default diagnostic pull up/down currents are disabled and comparator outputs are
masked by internal logic, to enable OFF state diagnostic the channel must be put first in
tristate condition and then (if not already done with previous MSC frames) diagnostic must
be enabled. Once the desired channel is put in tristate a false diagnostic can be sensed due
to the time needed to discharge output voltage through the load.
A Filter Time (Diag Filter Time) is implemented in order to avoid detecting false diagnosis as
shown in Figure 44.
GADG0512160753PS
Normal function
Open Load
Short toVB
VOUTOPEN
VOUTOPEN max
VOUTOPENmin
1.9V
V_OUTx
(high-side)
3V
VHVTmin
V-OL_THmax
Open Load
GADG0512160803PS
I_diag
I_HS_PD1+I_HS_PD2
I_HS_PD2
Tflt_diagoff1
t
Voutx
Tflt_diagoff1
t
VHVT
I_diag
I_HS_PD1+I_HS_PD2
I_HS_PD2
Tflt_diagoff1
t
Voutx
Tflt_diagoff1
t
VHVT



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