L9779WD datasheet(101/170 Pages) STMICROELECTRONICS

No. de pieza	L9779WD

Descripción Electrónicos	Multifunction IC for engine management system

PDF	170 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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101 / 170 page

DocID027452 Rev 5

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L9779WD

Functional description

169

6.16.2

Auto-adaptative sensor filter

Two main VRS configuration sets are available for VRS, by means of CONFIG_REG1

For VRS configurations in both limited and fully adaptive mode, CONFIG_REG5 is used.

Auto-adaptative hysteresis (fully adaptive mode)

When enabled the auto adaptative hysteresis works as described below.

Input signals difference is obtained through a full differential amplifier; its output, DV signal,

is fed to peak detection circuit and then to A/D converter implemented with 4 voltage

comparators (5 levels) (Pvi).

Output of A/D is sent to Logic block (Table 45: Hysteresis threshold precision) that

implements correlation function between Peak voltage and hysteresis value; hysteresis

value is used by square filtering circuit which conditions DV signal.

Figure 63. Auto adaptative hysteresis diagram

L9779WD Datasheet(PDF) 101 Page - STMicroelectronics