ADIS16COM1SLASHPCBZ datasheet(23/37 Pages) AD

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Preliminary Technical Data

ADIS16000/ADIS16229

Rev. PrA | Page 23 of 37

SENSOR NODE SPECTRAL ALARMS

The alarm function offers six spectral bands for alarm detection.

Each spectral band has high and low frequency definitions,

along with two different trigger thresholds (Alarm 1 and Alarm 2)

for each accelerometer axis. Table 40 provides a summary of

each register used to configure the alarm function.

Table 40. Alarm Function Register Summary

Address

Description

ALM_F_LOW

0x20

Alarm frequency band, lower limit

ALM_F_HIGH

0x22

Alarm frequency band, upper limit

ALM_X_MAG1

0x24

X-Axis Alarm Trigger Level 1 (warning)

ALM_Y_MAG1

0x26

Y-Axis Alarm Trigger Level 1 (warning)

ALM_X_MAG2

0x2A

X-Axis Alarm Trigger Level 2 (fault)

ALM_Y_MAG2

0x2C

Y-Axis Alarm Trigger Level 2 (fault)

ALM_PNTR

0x2C

Alarm pointer

ALM_S_MAG

0x2E

System alarm trigger level

ALM_CTRL

0x30

Alarm configuration

DIAG_STAT

0x34

Alarm status

ALM_X_STAT

0x38

X-axis alarm status

ALM_Y_STAT

0x3A

Y-axis alarm status

ALM_X_PEAK

0x3C

X-axis alarm peak

ALM_Y_PEAK

0x3E

Y-axis alarm peak

ALM_X_FREQ

0x44

X-axis alarm frequency of peak alarm

ALM_Y_FREQ

0x46

Y-axis alarm frequency of peak alarm

The ALM_CTRL register (see Table 41) provides control bits

that enable the spectral alarms of each axis, configures the system

alarm, sets the record delay for the spectral alarms, and configures

the clearing function for the DIAG_STAT error flags (see Table 84).

Table 41. ALM_CTRL

Page 1-6, Low Byte Address = 0x30, Read/Write

Bits

Description (Default = 0x0000)

[15:12]

Not used.

[11:8]

Response delay; range = 0 to 15. Represents the number

of spectral records for each spectral alarm before a

spectral alarm flag is set high.

Latch DIAG_STAT error flags. Requires a clear status

command (GLOB_CMD[4]) to reset the flags to 0.

1 = enabled, 0 = disabled.

Enable DO1 as an Alarm 1 output indicator and enable

DO2 as an Alarm 2 output indicator. 1 = enabled.

System alarm comparison polarity.

1 = trigger when less than ALM_S_MAG[11:0].

0 = trigger when greater than ALM_S_MAG[11:0].

System alarm. 1 = temperature, 0 = power supply.

Alarm S enable (ALM_S_MAG). 1 = enabled, 0 = disabled.

Not used

Alarm Y enable (ALM_Y_MAG). 1 = enabled, 0 = disabled.

Alarm X enable (ALM_X_MAG). 1 = enabled, 0 = disabled.

ALARM DEFINITION

The alarm function provides six programmable spectral bands,

as shown in Figure 20. Each spectral alarm band has lower and

upper frequency definitions for all of the sample rate options

(SRx). It also has two independent trigger level settings, which

are useful for systems that value warning and fault condition

indicators.

FREQUENCY

ALM_F_HIGH

ALM_F_LOW

ALM_x_MAG1

ALM_x_MAG2

Figure 20. Spectral Band Alarm Setting Example, ALM_PNTR = 0x03

Select the spectral band for configuration by writing its number

(1 to 6) to ALM_PNTR[2:0] (see Table 42). Then select the sample

rate option using ALM_PNTR[9:8]. This number represents a

binary number, which corresponds to the x in the SRx sample

rates option associated with REC_CTRL1[11:8] (see ). For

example, set ALM_PNTR[7:0] = 0x05 (DIN = 0xAC05) to select

Alarm Spectral Band 5, and set ALM_PNTR[15:8] = 0x02 (DIN

= 0xB102) to select the SR2 sample rate option.

Table 42. ALM_PNTR

Page 1-6, Low Byte Address = 0x2C, Read/Write

Bits

Description (Default = 0x0000)

[15:10]

Not used

[9:8]

Sample rate option; range = 0 to 3 for SR0 to SR3

[7:3]

Not used

[2:0]

Spectral band number; range = 1 to 6

Alarm Band Frequency Definitions

After the spectral band and sample rate settings are set, program

the lower and upper frequency boundaries by writing their bin

numbers to the ALM_F_LOW register (see Table 43) and

ALM_F_HIGH register (see Table 44). Use the bin width

definitions listed in Table 29 to convert a frequency into a bin

number for this definition. Calculate the bin number by dividing

the frequency by the bin width that is associated with the sample

rate setting. For example, if the sample rate is 5000 Hz and the

lower band frequency is 400 Hz, divide that number by the bin

width of 10 Hz to arrive at the 40th bin as the lower band setting.

Then set ALM_F_LOW[7:0] = 0x28 (DIN = 0xA028) to establish

400 Hz as the lower frequency for the 5000 SPS sample rate setting.

Table 43. ALM_F_LOW

Page 1-6, Low Byte Address = 0x20, Read/Write

Bits

Description (Default = 0x0000)

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