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L99H92 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Half-bridge pre-driver for automotive applications
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Figure 10. Full-bridge open-load-detection (short to VDH detected)
GADG120920220941SA
20k
20k
20k
DSM = 1
DSM = 1
VT=(5/6)Vs
Short
Vs
Vs
Vs
VT=(5/6)Vs
O1DS = 1
O2DS = 1
VT=(5/6)VDH
VT=(5/6)VDH
VDH
VDH
VDH
M
m
In case of short to VDH detection, achieved for OLTHH=1, the outputs of the two off-state diagnostic comparators
are inverted to be compliant to Table 4.
Table 4. Full-bridge monitoring in off-mode
Control bits
Failure bits
Comments
OLH1L2
OLH2L1
OLTHH
O1DS
O2DS
0
0
0
0
0
Off-state diagnostic disabled
1
0
x
0
0
No open-load detected
1
0
0
0
1
Open-load SH2
1
0
0
1
1
Short to GND
1
0
1
1
1
Short to VDH
0
1
x
0
0
No open-load detected
0
1
0
1
0
Open-load SH1
0
1
0
1
1
Short to GND
0
1
1
1
1
Short to VDH
What reported in this chapter applies only to single motor full-bridge configuration; that is, the case where one full-
bridge drives only one motor.
In dual half-bridge mode (INPMODE = 1), the device can still detect an open-load condition.
In off-state diagnostic mode, it is recommended to wait at least 2.5 ms, starting from any change of OLH2L1,
OLH1L2 or OLTHH control bits, before reading stable O1DS and O2DS status bits values.
L99H92
Diagnostic in off-mode (O1DS/O2DS)
DS14069 - Rev 4
page 14/77



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