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L9779WD Datasheet(PDF) 100 Page - STMicroelectronics

Part # L9779WD
Description  Multifunction IC for engine management system
PDF  170 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9779WD Datasheet(HTML) 100 Page - STMicroelectronics

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Functional description
L9779WD
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DocID027452 Rev 5
6.16
Flying wheel interface function
Figure 62. Flying wheel interface circuit
6.16.1
Flying wheel interface functionality description
The flying wheel interface is an interface between the microprocessor and the flying wheel
sensor: it handles signals 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.
This circuit implements an auto adaptative hysteresis and filter time algorithm that can be
configured via MSC using VRS_mode bit.
If the auto adaptive hysteresis is OFF the hysteresis value can be selected using VRS_Hyst
bit.
If fault is present (OL / SC GND / SC VB) the functionality is not guaranteed.



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