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L9177ATR Datasheet(PDF) 32 Page - STMicroelectronics

Part # L9177ATR
Description  Automotive engine management control IC for small engines
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9177ATR Datasheet(HTML) 32 Page - STMicroelectronics

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Figure 23. Low side driver diagnosis I-V relationship
GAPGPS00607
3.5.5
Current limited low side driver on/off diagnosis
In OFF condition diagnosis is the same as Low side, with Tmask 3.5 ms ±25 % and Tdgc_noise 3.6 µs ± 40 %,
while in ON condition initial Inrush current is masked for Tmask_rush of 336 µs ±25 % then, if an over current
fault occurs the drivers enter in current limitation condition for a digital filtering time Tdgc of 20 µs ±25 %, then it is
switched OFF and the fault is latched. The channel is turned ON again by input command transition. The latched
fault is cleared on request via SPI. Over current fault has higher priority with respect to OFF condition faults.
L9177A
Diagnosis
DS12175 - Rev 5
page 32/55



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