SCA21X0 VTI [VTI technologies], SCA21X0 Datasheet - Page 16

• Manufacturer Part Number: SCA21X0
• Description: VTI Automotive Digital Accelerometer Platform
• Manufacturer: VTI [VTI technologies]

3.1.5.2
VTI Technologies Oy
www.vti.fi
Temperature Register High (TEMP_MSB)
Address: 13h
The bit level description of temperature data:
In SCA8X0 temperature data is not factory calibrated and hence sensitivity and offset of
temperature data varies from part to part. Temperature data is in 2's complement format and 14
bits (13:0) of TEMP_MSB/TEMP_LSB are used for temperature. Here is presented temperature
calculation using 10bit but 4-extra LSB bit can be used to improve resolution in noise sense if
needed.
Table 6 Bit level description for SCA8X0 temperature registers
Register
Bit number
Bit temperature weight [°C]
Bit in temperature register xx
x = not used bit
r=reserved
where Temp[°C] is temperature in Celsius and Temp
TEMP_LSB registers in decimal format, bits(t9:0). k is temperature slope factor specified as
In SCA21X0 and SCA31X0 offset of temperature data is factory calibrated but sensitivity of the
temperature data varies from part to part. Temperature data is in unsigned format and 13 bits
(13:1) of TEMP_MSB/TEMP_LSB are used for temperature. Here is presented temperature
calculation using 10bit but 3-extra LSB bit can be used to improve resolution in noise sense if
needed.
Table 7 Bit level description for SCA21X0/31X0 temperature registers
Register
Bit number
Bit temperature weight [°C]
Bit in temperature register xx
x = not used bit
r=reserved
Temperature registers’ typical output at +23 °C is 512 counts and 1 °C change in temperature
typically corresponds to 3.2 LSB change in temperature output. Temperature information is
converted to [°C] as follows
Temp
Bits
7:0
[ ] (
°
C
=
Mode
R
45
k
±
32
Initial
Value
00h
)
°
C
+
Min
2.8
TEMP_MSB
B7:B6
xx
TEMP_MSB
B7:B6
xx
Temp
k
LSB
o
C
t9
Doc. Nr. 82 694 00 C
Name
DATA
B5
~162
B5
sign
t9
dec
,
Typ
3.1
B4
~82
t8
B4
~81
t8
B3
~41
t7
B3
~41
t7
Description
Data bits [15:8] of temperature sensor.
Reading of this register latches TEMP_LSB.
B2
~21
t6
B2
~20
T6 T5 t4
Max
3.5
B1
~10
B1
~10
T5 t4
dec
B0
~5.1
B0
~5.1
is temperature from TEMP_MSB and
TEMP_LSB
B7
~2.5
t3
Unit
LSB/
TEMP_LSB
B7
~2.6
t3
t2
B6
~1.3
o
B6
~1.3
t2
C
B5
~0.6
t1
B5
~0.6
t1
SCA8X0/21X0/3100 Series
B4
~0.3
t0
B4
~0.3
t0
B3:B0
rrrx
rrrx
B3:B0
rrrr
rrrr
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