ADIS16354SLASHPCBZ datasheet(21/28 Pages) AD

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ADIS16354

Rev. 0 | Page 21 of 28

Status Conditions

The STATUS register contains the following error condition

flags: alarm conditions, self-test status, overrange, SPI

communication failure, control register update failure, and

power supply range failure. See Table 31 and Table 32 for the

appropriate register access and bit assignment for each flag.

The bits assigned for checking power supply range and sensor

overrange automatically reset to zero when the error condition

no longer exists. The remaining error flag bits in the STATUS

STATUS register read clears all of the bits to zero. If any error

conditions remain, the bits revert to 1 during the next internal

output register update cycle.

Table 31. STATUS Register Definition

Address

Default

Format

Access

0x3D, 0x3C

0x0000

N/A

Read only

Table 32. STATUS Bit Descriptions

Bits

Description

[15]

Z-axis accelerometer self-diagnostic error flag

1 = failure, 0 = passing

[14]

Y-axis accelerometer self-diagnostic error flag

1 = failure, 0 = passing

[13]

X-axis accelerometer self-diagnostic error flag

1 = failure, 0 = passing

[12]

Z-axis gyroscope self-diagnostic error flag

1 = failure, 0 = passing

[11]

Y-axis gyroscope self-diagnostic error flag

1 = failure, 0 = passing

[10]

X-axis gyroscope self-diagnostic error flag

1 = failure, 0 = passing

[9]

Alarm 2 status

1 = active, 0 = inactive

[8]

Alarm 1 status

1 = active, 0 = inactive

[7:6]

Not used

[5]

Self-test diagnostic error flag

1 = error condition, 0 = normal operation

[4]

Sensor overrange (any of the six)

1 = error condition, 0 = normal operation

[3]

SPI communications failure

1 = error condition, 0 = normal operation

[2]

Control register update failed

1 = error condition, 0 = normal operation

[1]

Power supply in range above 5.25 V

1 = above 5.25 V, 0 = below 5.25 V (normal)

[0]

Power supply below 4.75 V

1 = below 4.75 V, 0 = above 4.75 V (normal)

Alarms

The ADIS16354 provides two independent alarm options for

event detection. Event detections occur when output register

data meets the configured conditions. Configuration options

include the following:

•

All output data registers are available for monitoring as the

source data.

•

The source data can be filtered or unfiltered.

•

Comparisons can be static or dynamic (rate of change).

•

The threshold levels and times are configurable.

•

Comparison can be greater than or less than.

The ALM_MAG1 register and the ALM_MAG2 register both

establish the threshold level for detecting events. These registers

take on the format of the source data and provide a bit for

establishing the greater than/less than comparison direction.

When making dynamic comparisons, the ALM_SMPL1 register

and the ALM_SMPL2 register establish the number of averages

taken for the source data as a reference for comparison. In this

configuration, each subsequent source data sample is subtracted

from the previous one, establishing an instantaneous delta. The

ALM_CTRL register controls the source data selection, static/

dynamic selection, filtering selection, and digital input/output

usage for the alarms.

The rate of change calculation is

ettings.

/ALM_MAG2

ALM_MAG1

according

with

comparing

determined

alarm

change

Rate

)

(

)

(

∑

−

where:

NDS is the number of samples in ALM_SMPL1 and

ALM_SMPL2.

y(n) is the sampled output data.

MC is the magnitude for comparison in ALM_MAG1 and

ALM_MAG2.

YC is the factor to compare with MC.

ADIS16354/PCBZ Datasheet(PDF) 21 Page - Analog Devices

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