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L9679P Fiches technique(PDF) 176 Page - STMicroelectronics

No de pièce L9679P
Description  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Fiches technique(HTML) 176 Page - STMicroelectronics

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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.



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