sca3100 BI Technologies, sca3100 Datasheet - Page 18

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

3.2 Operation control registers
3.2.1 Control Register (CTRL)
VTI Technologies Oy
www.vti.fi
Address: 1h
Bits
7
6
5
4
3
2
1
Mode
RW
RW
RW
RW
RW
RW
RW
0
0
0
0
Initial
Value
0
0
0
Name
PORST
PDOW
SLEEP
ST
MST
ST_CFG
Doc. Nr. 82 694 00 C
Set chip to self-test mode.
SCA8X0:
This bit starts mass deflection self-test (see also
ST_CFG bit). This bit is set to 0, when test is
passed. This bit can not be set to 1 if PDOW is
already 1 or if PDOW is being set by the current
SPI command. Test is done automatically during
start-up and acceleration output data can be read
during test.
SCA21X0 and SCA31X0:
Start continuous self-test calculation (STC). This bit
can not be set to 1 if PDOW or SLEEP or MTST is
already 1 or if PDOW or SLEEP or MTST is being
set by the current SPI command. Use
INT_STATUS.STC and ST bit of SPI frame for test
result monitoring.
Memory self-test function is activated, when user
sets bit to ‘1’. This bit is reset to 0 when test is over.
During memory self test, SPI access is prevented
for 85us. This bit can not be set to 1 if PDOW or
SLEEP is already 1 or if PDOW or SLEEP is being
set by the current SPI command. Test is done
automatically during start-up. Set other bits to zero
in CTRL register by previous SPI command before
starting memory self-test by CTRL.MST command.
Use STATUS.CSMERR for test result monitoring
and in SCA21X0/SCA31X0 ST bit in SPI frame.
Self-test configuration.
SCA8X0:
Select direction of mass deflection.
SCA21X0 and SCA31X0:
Start gravitation based start-up self-test calculation
(STS).
This bit can not be set to 1 if PDOW or SLEEP or
MTST is already 1 or if PDOW or SLEEP or MTST
is being set by the current SPI command. STC and
Description
Reserved
1 means reset state. Bit gets set to 1 when the
digital gets reset by supply off control or under
voltage control. Bit is set after supply off/on
transition or startup. This bit can not be set by SPI
but it can be reset to 0 by writing a 0 over the SPI.
This bit is also sent as Bit3 of SPI output data frame
on MISO.
Set chip to power down mode
Set chip to sleep mode. This bit can not be set to 1
if PDOW is already 1 or if PDOW is being set by the
current SPI command. (bit is not used in SCA8X0)
SCA8X0/21X0/3100 Series
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