L9679P datasheet(176/279 Pages) STMICROELECTRONICS

Part #	L9679P

Description	Automotive advanced airbag for mid/high end applications and cut-off battery IC

PDF	279 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Remote sensor interface

L9679P

176/279

DS11627 Rev 7

CRC[1] = CRCext[2]+D[0]+D[1]+D[2]+D[4]+D[7]+D[8]+D[9]+D[11]+D[14]+D[15]+D[16]

CRC[0] = CRCext[1]+CRCext[0]+D[0]+D[2]+D[5]+D[6]+D[7]+D[9]+D[12]+D[13]+D[14]+D[16]

Where D[16:0]= RSDR[16:0] and CRCext[n] are the starting seed values (all '1').

9.1.3

Detailed description

Manchester decoding

The Manchester decoder will support remote sensor communication as per PSI

specification rev 1.3 for the modes configurable via the STS bits in the RSCRx registers.

The Manchester Decoder checks the duty-cycle and period of the start bits to determine

their validity, depending on the configuration of the PERIOD_MEAS_DISABLE bit in the

RSCRx registers. The expected time windows for the mid bit transitions of each subsequent

bit within the received frame are determined by means of the internal oscillator time base.

Glitches shorter than 25% of the minimum bit time duration are rejected.

L9679P Datasheet(PDF) 176 Page - STMicroelectronics