ADIS16228SLASHPCBZ datasheet(18/28 Pages) AD

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ADIS16228

Data Sheet

Rev. B | Page 18 of 28

Table 28. ALM_F_LOW (Base Address = 0x20), Read/Write

Bits

Description (Default = 0x0000)

[15:8]

Not used

[7:0]

Lower frequency, bin number; range = 0 to 255

Table 29. ALM_F_HIGH (Base 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 30

to Table 35) provide two independent trigger settings for all three

axes of acceleration data. They use the data format established

by the range settings in the REC_CTRL2 register (see Table 14)

and recording mode in REC_CTRL1[1:0] (see Table 9). 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 = 0xAD80, 0xAC00) 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 14 and Table 15 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

ALM_Z_MAG2 > ALM_Z_MAG1

Table 30. ALM_X_MAG1 (Base Address = 0x24), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

X-axis Alarm Trigger Level 1, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 31. ALM_Y_MAG1 (Base Address = 0x26), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

Y-axis Alarm Trigger Level 1, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 32. ALM_Z_MAG1 (Base Address = 0x28), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

Z-axis Alarm Trigger Level 1, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 33. ALM_X_MAG2 (Base Address = 0x2A), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

X-axis Alarm Trigger Level 2, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 34. ALM_Y_MAG2 (Base Address = 0x2C), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

Y-axis Alarm Trigger Level 2, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 35. ALM_Z_MAG2 (Base Address = 0x2E), Read/Write

Bits

Description (Default = 0x0000)

[15:0]

Z-axis Alarm Trigger Level 2, 16-bit unsigned (see Table 14

and Table 15 for the scale factor)

Table 36. ALM_S_MAG (Base Address = 0x32), 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 = 0xBF02).

After completing the spectral alarm band definitions, save

the settings by setting GLOB_CMD[12] = 1 (DIN = 0xBF10).

The device ignores the save command if any of these locations

has already been written to.

ALARM INDICATOR SIGNALS

DIO_CTRL[5:2] (see Table 66) and ALM_CTRL[6] (see

Table 26) provide controls for establishing DIO1 and DIO2 as

dedicated alarm output indicator signals. Use DIO_CTRL[5:2]

to select the alarm function for DIO1 and/or DIO2; then set

ALM_CTRL[6] = 1 to enable DIO1 to serve as an Alarm 1 indi-

cator and DIO2 as an Alarm 2 indicator. This setting establishes

DIO1 to indicate Alarm 1 (warning) conditions and DIO2 to

indicate Alarm 2 (critical) conditions.

ALARM FLAGS AND CONDITIONS

The FFT header (see Table 58) contains both generic alarm flags

(DIAG_STAT[13:8]; see Table 65) and spectral band-specific

alarm flags (ALM_x_STAT; see Table 37, Table 38, and Table 39).

The FFT header also contains magnitude (ALM_x_PEAK; see

Table 40, Table 41, and Table 42) and frequency information

(ALM_x_FREQ; see Table 43, Table 44, and Table 45) associated

with the highest magnitude of vibration content in the record.

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