ADIS16COM1SLASHPCBZ datasheet(24/37 Pages) AD

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ADIS16000/ADIS16229

Preliminary Technical Data

Rev. PrA | Page 24 of 37

[15:8]

Not used

[7:0]

Lower frequency, bin number; range = 0 to 255

Table 44. ALM_F_HIGH

Page 1-6, Low Byte Address = 0x22, Read/Write

Bits

Description (Default = 0x0000)

[15:8]

Not used

[7:0]

Upper frequency, bin number; range = 0 to 255

Alarm Trigger Settings

The ALM_x_MAG1 and ALM_x_MAG2 registers (see Table 45

to Table 48) provide two independent trigger settings for both

axes of acceleration data. They use the data format established

by the range settings in the REC_CTRL2 register (see Table 30)

and recording mode in REC_CTRL1[1:0] (see Table 27). For

example, when using the 0 g to 1 g mode for FFT analysis,

32,768 LSB is the closest setting to 500 mg. Therefore, set

ALM_Y_MAG2 = 0x8000 (DIN = 0xAB80, 0xAA00) to set the

critical alarm to 500 mg, when using the 0 g to 1 g range option

in REC_CTRL2 for FFT records. See Table 30 and Table 31 for

more information about formatting each trigger level. Note that

trigger settings that are associated with Alarm 2 should be

greater than the trigger settings for Alarm 1. In other words, the

alarm magnitude settings should meet the following criteria:

ALM_X_MAG2 > ALM_X_MAG1

ALM_Y_MAG2 > ALM_Y_MAG1

Table 45. ALM_X_MAG1

Page 1-6, Low Byte Address = 0x24, Read/Write

Bits

Description (Default = 0x0000)

[15:0]

X-axis Alarm Trigger Level 1, 16-bit unsigned (see Table 30

and Table 31 for the scale factor)

Table 46. ALM_Y_MAG1

Page 1-6, Low Byte Address = 0x26, Read/Write

Bits

Description (Default = 0x0000)

[15:0]

Y-axis Alarm Trigger Level 1, 16-bit unsigned (see Table 30

and Table 31 for the scale factor)

Table 47. ALM_X_MAG2

Page 1-6, Low Byte Address = 0x2A, Read/Write

Bits

Description (Default = 0x0000)

[15:0]

X-axis Alarm Trigger Level 2, 16-bit unsigned (see Table 30

and Table 31 for the scale factor)

Table 48. ALM_Y_MAG2

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

Bits

Description (Default = 0x0000)

[15:0]

Y-axis Alarm Trigger Level 2, 16-bit unsigned (see Table 30

and Table 31 for the scale factor)

Table 49. ALM_S_MAG

Page 1-6, Low Byte Address = 0x2E, Read/Write

Bits

Description (Default = 0x0000)

[15:0]

System alarm trigger level, data format matches target

from ALM_CTRL[4]

Enable Alarm Settings

Before configuring the spectral alarm registers, clear their

current contents by setting GLOB_CMD[9] = 1 (DIN = 0xB702).

After completing the spectral alarm band definitions, save

the settings by setting GLOB_CMD[12] = 1 (DIN = 0xB710).

The device ignores the save command if any of these locations

has already been written to.

ALARM INDICATOR SIGNALS

GPO_CTRL[5:0] (see Table 83) and ALM_CTRL[6] (see Table

41) provide controls for establishing DO1 and DO2 as dedicated

alarm output indicator signals. Use GPO_CTRL[5:0] to select the

alarm function for DO1 and/or DO2; then set ALM_CTRL[6] = 1

to enable DO1 to serve as an Alarm 1 indi-cator and DO2 as an

Alarm 2 indicator. This setting establishes DO1 to indicate

Alarm 1 (warning) conditions and DO2 to indicate Alarm 2

(critical) conditions.

ALARM FLAGS AND CONDITIONS

The FFT header (see Table 69) contains both generic alarm flags

(DIAG_STAT[13:8]; seeTable 84) and spectral band-specific

alarm flags (ALM_x_STAT; see Table 50, Table 51). The FFT

header also contains magnitude (ALM_x_PEAK; see Table 52,

Table 53) and frequency information (ALM_x_FREQ; see Table

54, Table 55) associated with the highest magnitude of vibration

content in the record.

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