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ADIS16385 Datasheet(PDF) 17 Page - Analog Devices

Part # ADIS16385
Description  Six Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADIS16385 Datasheet(HTML) 17 Page - Analog Devices

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Preliminary Technical Data
ADIS16385
Rev. PrA | Page 17 of 20
ALARMS
The ADIS16385 provides two independent alarms, Alarm 1 and
Alarm 2, which have a number of programmable settings. Table 33
provides a list of registers for these user settings.
Table 33. Registers for Alarm Configuration
Register
Address
Description
ALM_MAG1
0x26
Alarm 1, trigger setting
ALM_MAG2
0X28
Alarm 2, trigger setting
ALM_SMPL1
0x2A
Alarm 1, sample period
ALM_SMPL2
0x2C
Alarm 2, sample period
ALM_CTRL
0x2E
Alarm configuration
The ALM_CTRL register in Table 37 provides data source
selection (Bits[15:8]), static/dynamic setting for each alarm
(Bits[7:6]), trigger polarity (Bits[5:4]), data source filtering
(Bit[3]), and alarm indicator signal (Bits[2:0]).
Static Alarm Use
The static alarms setting compares the data source selection
(ALM_CTRL[15:8]) with the values in the ALM_MAGx registers
in Table 34 and Table 35. The data format in these registers
matches the format of the data selection in ALM_CTRL[15:8].
The ALM_CTRL[5:4] bits provide polarity settings. See Table 38,
Alarm 1, for a static alarm configuration example.
Table 34. ALM_MAG1 Bit Descriptions
Bits
Description (Default = 0x0000)
[15:0]
Threshold setting; matches for format of
ALM_CTRL[11:8] selection
Table 35. ALM_MAG2 Bit Descriptions
Bits
Description (Default = 0x0000)
[15:0]
Threshold setting; matches for format of
ALM_CTRL[15:12] selection
Dynamic Alarm Use
The dynamic alarm setting monitors the data selection for a
rate-of-change comparison. The rate-of-change comparison is
represented by the magnitude in the ALM_MAGx registers over
the time represented by the number-of-samples setting in the
ALM_SMPLx registers, located in Table 36. See Table 38, Alarm 2,
for a dynamic alarm configuration example.
Table 36. ALM_SMPL1 and ALM_SMPL2 Bit Descriptions
Bits
Description (Default = 0x0000)
[15:8]
Not used
[7:0]
Binary, number of samples (both 0x00 and 0x01 = 1)
Alarm Reporting
The DIAG_STAT[9:8] bits provide error flags that indicate an
alarm condition. The ALM_CTRL[2:0] bits provide controls for
a hardware indicator using DIO1 or DIO2.
Table 37. ALM_CTRL Bit Descriptions
Bits
Description (Default = 0x0000)
[15:12]
Alarm 2 data source selection
0000 = disable
0001 = x-axis gyroscope output
0010 = y-axis gyroscope output
0011 = z-axis gyroscope output
0100 = x-axis accelerometer output
0101 = y-axis accelerometer output
0110 = z-axis accelerometer output
0111 = internal temperature output
1000 = auxiliary ADC input
1001 = self test
[11:8]
Alarm 1 data source selection (same as Alarm 2)
[7]
Alarm 2, dynamic/static (1 = dynamic, 0 = static)
[6]
Alarm 1, dynamic/static (1 = dynamic, 0 = static)
[5]
Alarm 2, polarity (1 = greater than, 0 = less than)
[4]
Alarm 1, polarity (1 = greater than, 0 = less than)
[3]
Data source filtering (1 = filtered, 0 = unfiltered)
[2]
Alarm indicator (1 = enabled, 0 = disabled)
[1]
Alarm indicator active polarity (1 = high, 0 = low)
[0]
Alarm output line select (1 = DIO2, 0 = DIO1)
Alarm Example
Table 38 offers an example that configures Alarm 1 to trigger
when filtered ZACCL_OUT data drops below 0.7g, and Alarm 2 to
trigger when filtered ZGYRO_OUT data changes by more than
50°/sec over a 100 ms period, or 5,000°/sec2. The filter setting
helps reduce false triggers from noise and refine the accuracy of
the trigger points. The ALM_SMPL2 setting of 102 samples
provides a comparison period that is 99.6 ms for an internal
sample rate of 1024 SPS. Because Alarm 1 is a static alarm in
this example, there is no need to program ALM_SMPL1.
Table 38. Alarm Configuration Example 1
DIN
Description
0xAF36,
ALM_CTRL = 0x36AF.
0xAEAF
Alarm 2: dynamic, Δ-ZGYRO_OUT (Δ-time, ALM_SMPL2) >
ALM_MAG2.
Alarm 1: static, ZACCL_OUT < ALM_MAG1. Use filtered
data source for comparison. DIO2 output indicator,
positive polarity.
0xA90F,
0xA8A0
ALM_MAG2 = 0x0FA0 (+50°/sec).
0xA70A,
0xA6F0
ALM_MAG1 = 0x0AF0 (0.7 g).
0xAC76
ALM_SMPL2[7:0] = 0x66 (102 samples).


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