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ADIS16266 Datasheet PDF : 24 Pages
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ADIS16266
ALARMS
Alarm Registers
The alarm function provides monitoring for two independent
conditions. The ALM_CTRL register provides control inputs for
data source selection, 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 35 gives
an example of how to configure a static alarm. The ALM_SMPLx
registers provide the numbers 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.
See Table 36 for an example of how to configure the sensor for this
type of function.
Table 30. ALM_MAG1 Bits (Base Address = 0x20)
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 31. ALM_MAG2 Bits (Base Address = 0x22)
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 32. ALM_SMPL1 Bits (Base Address = 0x24)
Bits
Description (Default = 0x0000)
[15:8] Not used.
[7:0] Data bits: number of samples (both 0x00 and 0x01 = 1).
Table 33. ALM_SMPL2 Bits (Base Address = 0x26)
Bits
Description (Default = 0x0000)
[15:8] Not used.
[7:0] Data bits: number of samples (both 0x00 and 0x01 = 1).
Data Sheet
Table 34. ALM_CTRL Bits (Base Address = 0x28)
Bits
Description (Default = 0x0000)
15
Dynamic rate-of-change enable for Alarm 2 (1 = rate
of change, 0 = static level).
[14:12] Alarm 2 source selection.
000 = disable.
001 = power supply output.
010 = gyroscope output.
011 = not used.
100 = not used.
101 = auxiliary ADC input.
110 = temperature output.
111 = not used.
11
Rate-of-change enable for Alarm 1 (1 = dynamic rate
of change, 0 = static level).
[10:8] Alarm 1 source selection (same as for Alarm 2).
[7:5] 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 35. Alarm Configuration Example 1
DIN
Description
0xA922,
0xA817
ALM_CTRL = 0x2217.
Alarm 1 input = GYRO_OUT.
Alarm 2 input = GYRO_OUT.
Static level comparison, filtered data.
DIO2 output indicator, positive polarity.
0xA183,
0xA0E8
ALM_MAG1 = 0x83E8.
Alarm 1 is true if GYRO_OUT > +4170°/sec.
0xA338,
0xA230
ALM_MAG2 = 0x3830.
Alarm 2 is true if GYRO_OUT < −8340°/sec.
Rev. A | Page 18 of 24
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