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L9680 Datasheet(PDF) 156 Page - STMicroelectronics

Part # L9680
Description  Automotive advanced airbag IC for mid/high end applications
PDF  277 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9680 Datasheet(HTML) 156 Page - STMicroelectronics

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SPI interfaces
L9680
156/277
DocID029257 Rev 1
7.6.3
Remote sensor x current registers y (RSTHRx_y)
Remote sensor 0, base current and delta to calculate 1st top current (RSTHR0_L)
Remote sensor 1, base current and delta to calculate 1st top current (RSTHR1_L
Remote sensor 2, base current and delta to calculate 1st top current (RSTHR2_L
Remote sensor 3, base current and delta to calculate 1st top current (RSTHR3_L
Remote sensor 0 (only for WSS), delta to calculate 2nd top current (RSTHR0_H)
Remote sensor 1 (only for WSS), delta to calculate 2nd top current (RSTHR1_H
Remote sensor 2 (only for WSS), delta to calculate 2nd top current (RSTHR2_H
Remote sensor 3 (only for WSS), delta to calculate 2nd top current (RSTHR3_H
ID:
5C (RSTHR0_L)
5D (RSTHR1_L)
5E (RSTHR2_L)
5F (RSTHR3_L)
60 (RSTHR0_H)
61 (RSTHR1_H)
62 (RSTHR2_H)
63 (RSTHR3_H
Type:
R
Read:
5C00 (RSTHR0_L)
5D00 (RSTHR1_L)
5E00 (RSTHR2_L)
5F00 (RSTHR3_L)
6000 (RSTHR0_H)
6100 (RSTHR1_H)
6200 (RSTHR2_H)
6300 (RSTHR3_H
Write:
-
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_RS
DELTA 1ST TOP [9:0]
BASE CURRENT [9:0]
MISO_RS
0
0
0
0
0
0
0
0
0
0
DELTA 2ND TOP [9:0]
BASE CURRENT [9:0]
$A1 $A1 $A1
PSI5/WSS base current measured by internal converter (93.75 μA ±9% each
LSB).
DELTA 1ST TOP
[19:10]
$103 $103 $103 PSI5/WSS delta measured by internal converter respect to base current
(93.75 μA ±9% each LSB) to get top current.
Low threshold = base current+(DELTA_1ST_TOP/2) in case of WSS or PSI5
without current averaged algorithm (bit 4 of RSRCx register equal to 0).
Low threshold = base current+(DELTA_1ST_TOP) in case of PSI5 with
current averaged algorithm (bit 4 of RSRCx register equal to 1).



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