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L99MH98 датащи(PDF) 42 Page - STMicroelectronics

номер детали L99MH98
подробное описание детали  Automotive octal half-bridge pre-driver
PDF  147 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L99MH98 датащи(HTML) 42 Page - STMicroelectronics

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The normal condition is described in the Table 30 first line.
Short to VDH condition is described in the Table 30 second line.
Short to GND condition is described in the Table 30 third line.
Open load condition is described in the Table 30 fourth line. The pull-up and pull-down can be selected by using
the register HB_IDIAGx for each half-bridge.
The available configuration is reported below:
•
00: pull-up OFF, pull-down OFF
•
01: pull-up OFF, pull-down ON
•
10: pull-up ON, pull-down OFF
•
11: pull-up OFF pull-down OFF
Table 30. Differentiation between normal condition, short to VDH, short to GND and open load with one
motor
Load conditions Configuration IPU HBx IPU HBy IPD HBx IPD HBy VDS_LSx VDS_LSy VDS_HSx VDS_HSy
Normal condition
1
OFF
OFF
ON
ON
LOW
LOW
HIGH
HIGH
2
ON
OFF
OFF
ON
HIGH
HIGH
HIGH
HIGH
3
OFF
ON
ON
OFF
HIGH
HIGH
HIGH
HIGH
Short to VDH
1
OFF
OFF
ON
ON
HIGH
HIGH
LOW
LOW
2
ON
OFF
OFF
ON
HIGH
HIGH
LOW
LOW
3
OFF
ON
ON
OFF
HIGH
HIGH
LOW
LOW
Short to GND
1
OFF
OFF
ON
ON
LOW
LOW
HIGH
HIGH
2
ON
OFF
OFF
ON
LOW
LOW
HIGH
HIGH
3
OFF
ON
ON
OFF
LOW
LOW
HIGH
HIGH
Open load
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
5.6
Off-state diagnostic with more cascaded motors
The L99MH98 allows to connect and drive up to seven motors sequentially (see the Figure 28). This chapter
provides hints about the off-state diagnostic with two cascaded motors controlled by three half-bridges (see the
Figure 29). The same logic can be used to perform off-state diagnostics when more than two motors are
connected in a sequential configuration
Figure 28. Seven cascaded DC motors summary of the off-state diagnostic
VDH
SH1
SH2
GND
M
VDH
SH8
GND
M
VDS_LS1
+
-
VDS_LS1_DIAG
VDS_HS1
+
-
VDS_HS1_DIAG
VDS_LS8
+
-
VDS_LS8_DIAG
VDS_HS8
+
-
VDS_HS8_DIAG
GND
VSHx_OL
IPD
IPU
VODLS = 1.8 V
VODLS = 1.8 V
VODHS = 1.8 V
VODHS = 1.8 V
IPU
IPD
GND
M
SH3
IPU
IPD
GND
+-
+-
+-
+-
VSHx_OL
VSHx_OL
The proposed principle for the off-state diagnostic consists of analyzing VDS_LS1/2/3 and VDS_HS1/2/3 when all
pull-up diagnostic currents are deactivated, and when two out of three pull-up diagnostic currents are activated.
The results are summarized in the Table 31.
L99MH98
Protections and diagnostics
DS14611 - Rev 3
page 42/147



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