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L9658 датащи(PDF) 27 Page - STMicroelectronics

номер детали L9658
подробное описание детали  Analog output available for resistance
PDF  64 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9658 датащи(HTML) 27 Page - STMicroelectronics

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L9658
Functional description
Doc ID 14219 Rev 3
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4.10.2
Continuity diagnostic
A continuity diagnostic includes a short to battery, a short to ground and an open circuit
diagnostics.
During a continuity diagnostic, IBIAS is switched on. On a normal loading condition, SQH
voltage is below SBTH threshold and SQL voltage will be above SGTH threshold.
Figure 14.
Continuity diagnostic flow chart
4.10.3
Short to battery
A short to battery condition will be detected when the voltage on SQH is greater than SBTH
threshold voltage.
4.10.4
Short to ground and open circuit
A short to ground or an open circuit conditions are detected when the voltage on SQL is less
than SGTH threshold voltage. A resistance measurement is utilized to differentiate between
a short to ground or an open circuit conditions.
BEGIN
SQH > SB
th
during t
FLT_DLY
END
SPI Command:
Connect I
BIAS
SQL < SG
th
during t
FLT_DLY
Clear SBth and SGth bits
Disconnect I
BIAS
Y
SPI Response:
Send SBth and SGth bits
Set SPI.Diag.SB
TH
Set SPI.Diag.SG
TH
SPI Command:
Disconnect I
BIAS
N
Y
t
FLT_DLY= 20μ
s
N
Note:
SPI Transmission and SPI
Command can be sent in
the same CS_D.
SPI Transmission
Y
Y
Clear SPI.Diag.SG
TH
Clear SPI.Diag.SB
TH
N
SQH < SB
th
during t
FLT_DLY
N
SQL > SG
th
during t
FLT_DLY
Y
Y
N



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