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L9177 Datasheet(PDF) 38 Page - STMicroelectronics

Part # L9177
Description  Peripheral on chip for low end engine control
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9177 Datasheet(HTML) 38 Page - STMicroelectronics

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Functional description
L9177
38/49
DocID17617 Rev 1
4.5.8
VRS diagnosis
VRS block enters diagnosis phase on request via SPI and then generates a Fault bit. If the
fault exceeds the Tdgc filter time of 30 μs ±20 %, it is latched. The latched fault is cleared on
request via SPI.
Figure 27. VRS diagnosis I-V relationship
4.6
VRS interface
4.6.1
Function characteristic
The flying wheel interface is an interface between the μP and the flying wheel sensor: it
conditions signal coming from magnetic pick-up sensor or hall effect sensor and feeds the
digital signal to microcontroller that extracts flying wheel rotational position, angular speed
and acceleration.
Figure 28. VRS typical characteristics
Figure 29. VRS interface structure



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