SCA8X0 datasheet(9/35 Pages) VTI

9 / 35 page

SCA8X0/21X0/3100 Series

VTI Technologies Oy

9/35

www.vti.fi

Doc. Nr. 82 694 00 C

2.4

Power Down mode

For low power applications it is possible to set the accelerometer into power down mode. During

the power down mode the power consumption is minimized inside the device. This is achieved by

stopping the internal clocks and resetting the control registers of the device. Please refer to the

individual device data sheets for detail power consumption figures.

2.5

Recommended start-up sequence

For correct device operation there are no specific configuration needed for the device before

starting of measuring the acceleration. However if the device detail features are being used the

following operations could be made after the powering on the device.

Table 2:

SCA8X0 start up sequence

Item

Procedure

Functions

Check

Set Vdd=3.0...3.6V

•

Set the

power on to

release part

from reset

and to start

the operation

Wait 95ms

•

During the

first 95ms the

part is

performing

the memory

read and self-

diagnostics.

•

Possible

signal path

self-

diagnostic

test is carried

out.

•

Settling of

signal path

Read CTRL-register

•

Check the

self-test pass

status

•

CTRL.ST=0

•

SPI fixed bits

•

dPAR, data parity

Read STATUS-register

•

Check the

memory

checksum

pass status

•

STATUS.CSMERR=0

•

SPI fixed bits

•

SPI FRME=0

•

dPAR, data parity

Write CTRL=0000 0000

•

After device

power on set

PORST=0 to

be able to

detect any

future

occurring

power

failures

•

SPI fixed bits

•

SPI FRME=0

Read X_MSB, X_LSB –

registers

•

Start reading

the

acceleration

data

•

SPI fixed bits

•

SPI FRME=0

•

SPI PORST=0

•

dPAR, data parity

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