sca3100 BI Technologies, sca3100 Datasheet - Page 10

• Manufacturer Part Number: sca3100
• Description: Automotive Digital Accelerometer Platform
• Manufacturer: BI Technologies

2.6 Recommended operation sequence
VTI Technologies Oy
www.vti.fi
Table 3: SCA21X0 and SCA31X0 start up sequence
Table 4: Reading of the acceleration data
Item
1
2
3
4
5
6
7
Item
1
2
3
4
Procedure
Read acceleration data
Repeat item 1 (N-1) times
Calculate average (AVE) of
N-samples
Read acceleration data
Procedure
Set Vdd=3.0...3.6V
Wait 35ms
Read INT_STATUS
Write
CTRL=00001010 (a)
or
CTRL=00001000 (b)
or
CTRL=00000000 (c)
Wait 10ms
Read CTRL
Read Z_MSB, Z_LSB,
Y_MSB, Y_LSB,
X_MSB, X_LSB
Doc. Nr. 82 694 00 C
Functions
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STS calculation
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Read acceleration data
Release part from
reset
Memory reading
and self-diagnostic
Settling of signal
path
Acknowledge for
possible saturation
(SAT-bit)
Checksum pass
detected from SPI
frame
Set PORST=0 (abc)
Start STC (ab)
Start STS (a)
Check that STC is
on, if enabled
Check that STS is
over if enabled
Functions
Desired x, y,
or/and z-data
Noise
averaging
Noise
averaging
Desired x, y,
or/and z-data
(one read
before sending
Check
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Check
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SPI fixed bits
SPI FRME=0
SPI PORST=0
SPI ST=0
SPI SAT=0
dPAR, data
parity
SPI fixed bits
SPI FRME=0
SPI PORST=0
SPI fixed bits
SPI ST=0
SPI fixed bits
SPI FRME=0
SPI ST=0
SPI SAT=0
CTRL.ST=1
CTRL.ST_CFG=0
SPI fixed bits
SPI FRME=0
SPI PORST=0
SPI ST=0
SPI SAT=0
dPAR, data parity
SPI fixed bits
SPI FRME=0
SPI PORST=0
SPI ST=0
SPI SAT=0
dPAR, data parity
SCA8X0/21X0/3100 Series
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