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L9300 Fiches technique(PDF) 77 Page - STMicroelectronics

No de pièce L9300
Description  Automotive flexible U-chip for braking and transmission
PDF  178 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 Fiches technique(HTML) 77 Page - STMicroelectronics

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Figure 46. WD enable/disable function
GADG0408170843PS
13.1.1
PRUN over frequency detection
PRUN Over Frequency Detection PRN frequency error is detected if the frequency is higher than 1 kHz and is not
detected if the frequency is lower than 750 Hz. In other words, when the interval between PRN rising edges is
less than 1ms, watchdog detects PRUN over frequency and doesn't clear the WDT counter. In addition, if this
condition continues during Toff, RES1 pin drives low.
Table 49. How PRN frequency effects PRUN
PRN frequency
Effect on PRUN logic
from 0 Hz to 750 Hz
PRN width counter surely reset.
No RES1 generated
from 750 Hz to 1 kHz
Gray area. No action guaranteed
from 1 kHz
PRN width counter not reset.
RES1 generated
L9300
PRUN watchdog
DS12258 - Rev 5
page 77/178



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