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L99MH98 Fiches technique(PDF) 41 Page - STMicroelectronics

No de pièce L99MH98
Description  Automotive octal half-bridge pre-driver
PDF  147 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99MH98 Fiches technique(HTML) 41 Page - STMicroelectronics

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SH1 is pulled down by Ishx_PD HB1, so VDS_LS1 = LOW and VDS_HS1 = HIGH. Instead, SH2 is pulled up by
Ishx_PU HB2: VDS_LS2 = HIGH and VDS_HS2 = HIGH.
The Figure 26 and Table 29 summarize the results obtained with an open load at SH1.
Figure 26. One motor - Diagnostic results with an open load at SH1
+
-
VDS_HSx_DIAG
+
-
VDS_LSx_DIAG
VDH
GND
VSHx_OL
IPD
IPU
IPD
IPU
SH1
SH2
GND
GND
VSHx_OL
M
+
-
VDS_HSx_DIAG
+
-
VDS_LSx_DIAG
GH1
GL1
GH2
GL2
HIGH
VODLS = 1.8 V
VODLS = 1.8 V
VODHS = 1.8 V
VODHS = 1.8 V
VDS_LSx
VDS_HSx
VDS_HSx
HIGH
LOW
LOW
+
-
+
-
+
-
+
-
VDS_LSx
Table 29. Truth table open load - SH1 disconnected
Configuration
IPU HB1
IPU HB2
IPD HB1
IPD HB2
VDS_LS1
VDS_LS2
VDS_HS1
VDS_HS2
1
OFF
OFF
ON
ON
LOW
LOW
HIGH
HIGH
2
ON
OFF
OFF
ON
HIGH
LOW
HIGH
HIGH
3
OFF
ON
ON
OFF
LOW
HIGH
HIGH
HIGH
5.4.7
Open load - SH2 is disconnected
Similarly, a motor disconnection at SH2 shows the same result as for a motor disconnection at SH1 (see the
Figure 27). Therefore, the Table 29 is valid for an open load, independently from the location of the disconnection.
Figure 27. One motor - Diagnostic results with an open load at SH2
+
-
VDS_HSx_DIAG
+
-
VDS_LSx_DIAG
VDH
GND
VSHx_OL
IPD
IPU
IPD
IPU
SH1
SH2
GND
GND
VSHx_OL
M
VDS_HSx
+
-
VDS_HSx_DIAG
VDS_LSx
+
-
VDS_LSx_DIAG
GH1
GL1
GH2
GL2
LOW
HIGH
LOW
HIGH
VODLS = 1.8 V
VODLS = 1.8 V
VODHS = 1.8 V
VODHS = 1.8 V
VDS_HSx
+
-
+
-
+
-
+
-
VDS_LSx
5.5
Summary of the off-state diagnostic
When compiling the results from the Table 26, Table 27, Table 28 and Table 29, we see that the test configuration
1 and the test configuration 2 (or test configuration 1 and the test configuration 3) are sufficient to detect and
distinguish between a normal load condition, a short circuit to VDH/GND, and an open load.
L99MH98
Protections and diagnostics
DS14611 - Rev 3
page 41/147



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