ADIS16400SLASHPCBZ datasheet(16/20 Pages) AD

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ADIS16400/ADIS16405

Rev. B | Page 16 of 20

Alarm Registers

The alarm function provides monitoring for two independent

conditions. The ALM_CTRL register provides control inputs

for data source, data filtering (prior to comparison), static

comparison, dynamic rate-of-change comparison, and output

indicator configurations. The ALM_MAGx registers establish the

trigger threshold and polarity configurations.

Table 27 gives an example of how to configure a static alarm.

The ALM_SMPLx registers provide the number of samples to

use in the dynamic rate-of-change configuration. The period

equals the number in the ALM_SMPLx register multiplied by

the sample period time, which is established by the SMPL_PRD

sensor for this type of function.

Table 24. ALM_CTRL Bit Designations

Bits

Settings

Description

Default = 0x0000

[15:12]

Alarm 2 source selection

0000

Disable

0001

Power supply output

0010

X-axis gyroscope output

0011

Y-axis gyroscope output

0100

Z-axis gyroscope output

0101

X-axis accelerometer output

0110

Y-axis accelerometer output

0111

Z-axis accelerometer output

1000

X-axis magnetometer output

1001

Y-axis magnetometer output

1010

Z-axis magnetometer output

1011

Gyroscope temperature output

1100

Auxiliary ADC input

[11:8]

Alarm 1 source selection (same as Alarm 2)

[7]

Rate-of-change (ROC) enable for Alarm 2

1 = rate of change, 0 = static level

[6]

Rate-of-change (ROC) enable for Alarm 1

1 = rate of change, 0 = static level

[5]

Not used

[4]

Comparison data filter setting

1 = filtered data, 0 = unfiltered data

[3]

Not used

[2]

Alarm output enable

1 = enabled, 0 = disabled

[1]

Alarm output polarity

1 = active high, 0 = active low

[0]

Alarm output line select

1 = DIO2, 0 = DIO1

Table 25. ALM_MAG1, ALM_MAG2

Bits

Description

Default = 0x0000

[15]

Comparison polarity

1 = greater than, 0 = less than

[14]

Not used

[13:0]

Data bits that match the format of the trigger

source selection

Table 26. ALM_SMPL1, ALM_SMPL2

Bits

Description

Default = 0x0000

[15:8]

Not used

[7:0]

Data bits: number of samples

(both 0x00 and 0x01 = 1)

Table 27. Alarm Configuration Example 1

DIN

Description

0xAF55,

0xAE17

ALM_CTRL = 0x5517.

Alarm 1 input = XACCL_OUT.

Alarm 2 input = XACCL_OUT.

Static level comparison, filtered data.

DIO2 output indicator, positive polarity.

0xA783,

0xA641

ALM_MAG1 = 0x8341.

Alarm 1 is true if XACCL_OUT > +0.5 g.

0xA93C,

0xA8BF

ALM_MAG2= 0x3CBF.

Alarm 2 is true if XACCL_OUT < −0.5 g.

Table 28. Alarm Configuration Example 2

DIN

Description

0xAF76,

0xAE87

ALM_CTRL = 0x7687.

Alarm 1 input = ZACCL_OUT.

Alarm 2 input = YACCL_OUT.

Rate of change comparison, unfiltered data.

DIO2 output indicator, positive polarity.

0xB601

SMPL_PRD = 0x0001.

Sample rate = 819.2 SPS.

0xAB08

ALM_SMPL1 = 0x0008.

Alarm 1 rate of change period = 9.77 ms.

0xAC50

ALM_SMPL2= 0x0050.

Alarm 2 rate of change period = 97.7 ms.

0xA783,

0xA641

ALM_MAG1 = 0x8341.

Alarm 1 is true if XACCL_OUT > +0.5 g.

0xA93C,

0xA8BE

ALM_MAG2= 0x3CBE.

Alarm 2 is true if XACCL_OUT < −0.5 g.

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