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SCA8X0 Datasheet(PDF) 14 Page - VTI technologies

Part # SCA8X0
Description  VTI Automotive Digital Accelerometer Platform
PDF  35 Pages
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Manufacturer  VTI [VTI technologies]
Direct Link  http://www.vti.fi
Logo VTI - VTI technologies

SCA8X0 Datasheet(HTML) 14 Page - VTI technologies

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SCA8X0/21X0/3100 Series
VTI Technologies Oy
14/35
www.vti.fi
Doc. Nr. 82 694 00 C
3.1.4
Output data conversion
3.1.4.1
2g products
+/-2g product
DOUT MSB bits(7:0)
DOUT LSB bits(7:0)
12b
12b
Bit number
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
[-]
Bits (15:4) Bits (15:4)
SCA8x0
s
1137.8
568.9
284.4
142.2
71.1
35.6
17.8
8.89
4.44
2.22
1.11
x
x
x
x
[mg]
[Dec]
[Hex]
+1g position
0
0
1
1
1
0
0
0
0
1
0
0
x
x
x
x
1000
900
384
-1g position
1
1
0
0
0
1
1
1
1
1
0
0
x
x
x
x
-1000
-900
C7C
+Full-scale
0
1
1
1
1
1
1
1
1
1
1
1
x
x
x
x
2274
2047
7FF
-Full-scale
1
0
0
0
0
0
0
0
0
0
0
0
x
x
x
x
-2275
-2048
800
+/-2g product
DOUT MSB bits(7:0)
DOUT LSB bits(7:0)
Bit number
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
[-]
Bits (15:2) Bits (15:2)
SCA31x0/SCA21x0
s
4551.1
2275.6
1137.8
568.9
284.4
142.2
71.1
35.56
17.78
8.89
4.44
2.22
1.11
x
x
[mg]
[Dec]
[Hex]
+1g position
0
0
0
0
1
1
1
0
0
0
0
1
0
0
x
x
1000
900
384
-1g position
1
1
1
1
0
0
0
1
1
1
1
1
0
0
x
x
-1000
-900
3C7C
+Full-scale *)
0
0
0
1
1
1
1
1
1
1
1
1
1
1
x
x
2274
2047
7FF
-Full-scale *)
1
1
1
0
0
0
0
0
0
0
0
0
0
0
x
x
-2275
-2048
3800
s = sign bit
x = not used/defined bit
*) = positive/negative full-scale or saturation limit of ±2 g product is 2.27 g.
In SCA8X0 acceleration bits can be converted to mg acceleration (Acc) using following equation
[]
[
]4
2
5
2
6
2
7
2
8
2
9
2
10
2
11
2
12
2
13
2
14
2
9
10
2
3
4
5
6
7
8
9
10
11
b
b
b
b
b
b
b
b
b
b
b
s
mg
Acc
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
−
=
and in SCA21X0/SCA31X0
[]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
−
=
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
2
10
2
11
2
12
2
13
2
14
2
9
10
2
3
4
5
6
7
8
9
10
11
12
13
b
b
b
b
b
b
b
b
b
b
b
b
b
s
mg
Acc
,
where bits are defined according to following table.
Acceleration MSB-register: Address 5'hex / 7'hex / 9'hex
Acceleration LSB-register: Address 4'hex / 6'hex / 8'hex
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
b15
b14
b13
b12
b11
b10
b9b8b7b6b5
b4b3b2b1b0
In data output registers of SCA21X0/SCA31X0 there is reserved room for different g-ranges. To
make sure that same software works with different product types it is recommended to use
bits(15:2) for data conversion. If dynamic output range of product does not require bits b14 or b13
they include copy of sign bit b15.
If self-test (checksum, STC, STS) alarms it sets ST bit in SPI frame and forces output data to value
7FFF'hex (checksum fail) or to value FFFF'hex (STC/STS alarm).
In SCA21X0/SCA31X0 there is also possible to use 1-extra lsb bit (b1) for calculation to improve
resolution. In that case acceleration bits can be converted to mg acceleration (Acc) using following
equation
[]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
+
⋅
−
=
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
2
10
2
11
2
12
2
13
2
14
2
18
10
2
3
4
5
6
7
8
9
10
11
12
13
14
b
b
b
b
b
b
b
b
b
b
b
b
b
b
s
mg
Acc
.



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