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L9679P Fiches technique(PDF) 95 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) 95 Page - STMicroelectronics

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DS11627 Rev 7
95/279
L9679P
SPI interfaces
278
7.4.24
WD2 seed read command register (WD2_SEED)
ID:
33
Type:
R
Read:
-
Write:
3300
7.4.25
WD2 key write command register (WD2_KEY)
ID:
34
Type:
W
Read:
-
Write:
0068
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MOSI
-
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
MISO
0
0
0
0
WD2_PREV_KEY[7:0]
WD2_SEED[7:0]
WD2_PREV_KEY[7:0] $0D $0D $0D Previous WD2 key value - stored key from previous comparison
WD2_SEED[7:0] $F0 $F0 $F0 Random WD2 seed value - generated from a free-running 8-bit counter
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MOSI
-
X
X
X
X
X
X
X
X
KEY[7:0]
MISO
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
KEY[7:0] $00 $00 $00 KEY value submitted to the WD2 state machine
(correct value is derived from WD2_KEY = WD2_SEED ‡ WD2_PREV_KEY
+ $01 where ‡ denotes a bit-wise XOR operation)



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