L9788 datasheet(38/264 Pages) STMICROELECTRONICS

Part #	L9788

Description	Multifunction IC for automotive engine management system

PDF	264 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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38 / 264 page

Operation behavior

L9788

38/264

DS12308 Rev 4

Finish wake function can be disabled by power supply undervoltage. The reset sources of

FIN_WAKE bit are the same as fin_wake function.

Software can decide to clear the WK_IN_DET, WAKE_UP_EOT_DET or

WAKE_UP_CAN_DET before or after the impulse timer timeout, through set WK_IN_RST,

WAKE_UP_EOT_RST or WAKE_UP_CAN_RST to 1

FIN_WAK function is stopped by

FIN_WAKE time out,

FIN_WAKE BIT =1,

WK_IN_RST / WK_EOT_RST /WK_CAN_RST of relevant detect signal.

When WK_IN_DET & WK_EOT_ DET &WK_CAN_ DET =0, FIN_WAK can be re-triggered

by any detection of WK_IN_DET / WK_EOT_ DET /WK_CAN_ DET. The counter is

restarted from 0.

Figure 9. Impulse timer clear WAKE_IN_DET after time out

Figure 10. Impulse timer disabled before time out

WK_IN pin

WAKE_IN_DET

Impulse timer

Tfin_wk

The time out of impulse timer

clears the WAKE_IN_DET

GADG1403171445PS

WK_IN pin

WAKE_IN_DET

Impulse timer

MSC

Tfin_wk

MSC Command to stop

the impulse Counter

GADG1403171500PS

L9788 Datasheet(PDF) 38 Page - STMicroelectronics