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L9679P 데이터시트(PDF) 192 Page - STMicroelectronics

부품명 L9679P
상세설명  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L9679P 데이터시트(HTML) 192 Page - STMicroelectronics

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Safing logic
L9679P
192/279
DS11627 Rev 7
12.2
SPI sensor data decoding
Sensor data is regularly communicated with the main microcontroller through multiple SPI
messages. The L9679P monitors SPI traffic on MISO_RS bus. Since not all communications
between sensors and the microcontroller contain data, it is important for the decoder to
properly sort the communications and extract only the targeted data. The solution involves
defining specific masking functions, contained within independent safing records,
programmed by the user. The following figures detail the SPI message decoding methodology
and the ensuing comparisons of valid sensor data to the programmed thresholds.
Figure 50. Safing engine – 32-bit message decoding flow chart
i=1
CC[i] = 0?
CS[i] =
cs_active?
IF[i] = 1?
N
Y
Y
N
Y
match[i]=1
matchCC[i]=1
match[i]=0
i++
Y
N
N
i = N?
Y
N
Outputs to VALDAT function :
dataresult[i]
req_ok[i]
match[i]
A
B
EN_SAF(i)
= 1?
Y
N
MSGDEC32
SPIFLDSEL[i]?
RESPTARG[i]=
1st16[MISO]&
RESPMASK[i]
RESPTARG[i]=
2nd16[MISO]&
RESPMASK[i]
1st16
req_ok[i]
= 1?
N
Y
2nd16
dataresult[i] =
1st16[MISO] &
DATAMASK [i]
dataresult[i] =
2nd[MISO] &
DATAMASK [i]
N
Y
REQTARG[i]=
MS16[MOSI]&
REQMASK[i]?
Y
N
match[i]=0
match[i]=0
Y
N
SPIFLDSEL[i]?
RESPTARG[i]=
1st16[MISO]&
RESPMASK[i]
RESPTARG[i]=
2nd16[MISO]&
RESPMASK[i]
1st16
2nd16
dataresult[i] =
1st16[MISO] &
DATAMASK [i]
dataresult[i] =
2nd[MISO] &
DATAMASK [i]
N
Y
match[i]=0
req_ok[i]=0
match[i]=0
req_ok[i]=0
req_ok[i]=1
req_ok[i]=0
REQTARG[i]=
MS16[MOSI]&
REQMASK[i]?
Y
N
match[i]=1
matchCC[i]=1
req_ok[i]=0
i = Safing Record index:
1: SR1
2: SR2
3: SR3
4: SR4
N=5 (L9678)
N=10 (L9679)
N=14 (L9680)
GAPGPS02292



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