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L99MH98 Fiches technique(PDF) 25 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) 25 Page - STMicroelectronics

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Table 22. Reset matrix
Functions/faults or
input
SPI
X
X
X(1)
O
O
O
O
O
O
O
O
O
Watchdog
X
X
X(2)
O
O
O
O
O
O
O
O
O
Diagnostic logic
X
X
X
O
O
O
O
O
O
O
O
O
Register map
X
X
O
O
O
O
O
O
O
O(3)
O
O
PWM controller
X
X
X
X
X
O
X
X
X
X
X
O
DIAGN
X
X
A
A
A
A
A
A
A
A
A
A
Indirect current
measurement system
X
X
X
X
X
O
X
X
X
X
O
O
Current generator
and ADC for
temperature
measurement
X
X
X
X
X
O
X
X
X
X
O
O
Gate drivers
X
X
X
C
X
O
X
X
X
X
X(4)
O
Charge pump
X
X
X
O
O
O
X
X(5)
O
X
O
O
1. SDO, DIAGN, CSO1 and CSO2 outputs are low.
2. After a VDDOV event the watchdog restarts with a long open window and must be reprogrammed.
3. The OUTEx registers are reset.
4. The half bridge in which the failure occurred and all the half bridges that are connected to the one that failed are turned off.
5. In the case of a charge pump not ready the CP is in power-up phase.
Note:
•
X = Power-off
•
O = Normal operation
•
A = Active
•
C = All the MOSFETs are disabled if GENMODExx = 0
All the HS MOSFETs are disabled. LS MOSFETs are ON to lock the motor if GENMODExx = 1
All the MOSFETs are ON. The microcontroller decides how to proceed if GENMODExx = 2
3.2.6
Power-up sequence
The power-up sequences that must be followed to turn on L99MH98 are reported below.
The first case of a possible power-on sequence is shown in the Figure 10. In this case VDH and VDD are raised
while the EN pin is kept low. After the VDH and VDD pins are high and stable, the EN pin is raised to turn on the
L99MH98 or lowered to turn it off. L99MH98 turns on when the EN pin exceeds the rising VENH threshold and will
turn off when it drops below the falling VENL threshold.
The fastest possible slew rate for VDD is 100 μs at 3.3 V.
L99MH98
Functional description
DS14611 - Rev 3
page 25/147



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