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L9300 Datasheet(PDF) 78 Page - STMicroelectronics

Part # L9300
Description  Automotive flexible U-chip for braking and transmission
PDF  178 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 Datasheet(HTML) 78 Page - STMicroelectronics

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Figure 47. WD PRUN over frequency detection
RES1
PRN
Toff
TRL
Pulse Width
Counter
Toff
Toff
In case that PRN frequency is higher than 1kHz, PRN counter is not cleared.
PRN
Counter
1ms (=1kHz)
tOFF
RESET
RESET
No detection – Valid PRN pulse
Detection – Invalid PRN pulse
1 Hz
750 Hz
1 kHz
GADG0408170946PS
13.1.2
Reset-Latch function
The device provides the Reset-Latch function to keep the RES1 signal at low level once 4 PRN reset event has
been detected.
L9300
PRUN watchdog
DS12258 - Rev 5
page 78/178



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