ADIS16135/PCBZ Analog Devices Inc, ADIS16135/PCBZ Datasheet - Page 13

• Manufacturer Part Number: ADIS16135/PCBZ
• Description: Precision Angular Rate Sensor Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of ADIS16135/PCBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Angular Rate Sensor / Gyroscope
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADIS16135
• Lead Free Status / RoHS Status: Lead free / RoHS non-compliant

ALARMS
The alarm function provides monitoring for two independent
conditions. Table 22 contains a list of registers that provide
configuration and control inputs for the alarm function.
Table 22. Registers for Alarm Configuration
Register
ALM_MAG1
ALM_MAG2
ALM_SMPL1
ALM_SMPL2
ALM_CTRL
The ALM_CTRL register (see Table 26) provides data source
selection (Bits[15:8]), rate-of-change enable (Bits[7:6]), trigger
polarity (Bits[5:4]), data source filtering (Bit 3), and an alarm
indicator signal (Bits[2:0]).
Static Alarm Use
Set the rate-of-change bits (ALM_CTRL[7:6]) equal to zero
for static alarm use, which compares the data source selection
(ALM_CTRL[15:8]) with the values in the ALM_MAGx registers
in Table 23 and Table 24. The data format in these registers
matches the format of the data selection in ALM_CTRL[15:8].
ALM_CTRL[5:4] provide polarity settings. See Table 27 for a
static alarm configuration example.
Table 23. ALM_MAG1 Bit Descriptions
Bits
[15:0]
Table 24. ALM_MAG2 Bit Descriptions
Bits
[15:0]
Dynamic Alarm Use
Set the rate-of-change bits (ALM_CTRL[7:6]) equal to 1 to enable
the dynamic alarm mode, which monitors the data selection for
a rate-of-change comparison. The rate of change is represented
by the magnitude in the ALM_MAGx registers over the time
represented by the number of samples setting in the ALM_SMPLx
register (see Table 25). See Table 27 for a dynamic alarm configura-
tion example.
Table 25. ALM_SMPL1, ALM_SMPL2 Bit Descriptions
Bits
[15:8]
[7:0]
Alarm Reporting
DIAG_STAT[9:8] provide error flags that indicate an alarm
condition. ALM_CTRL[2:0] provide controls for a hardware
indicator using DIO1 or DIO2.
Description (Default = 0x0000)
Threshold setting; matches format of the
ALM_CTRL[11:8] selection
Description (Default = 0x0000)
Threshold setting; matches for format of the
ALM_CTRL[15:12] selection
Description (Default = 0x0000)
Not used
Binary, number of samples (both 0x00 and 0x01 = 1)
Address
0x10
0X12
0x14
0x16
0x18
Description
Alarm 1, trigger setting
Alarm 2, trigger setting
Alarm 1, sample period
Alarm 2, sample period
Alarm configuration
Rev. B | Page 13 of 20
Table 26. ALM_CTRL Bit Descriptions
Bits
[15:12]
[11:8]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
1
Alarm Example
Table 27 offers an example that configures Alarm 1 to trigger
when filtered GYRO_OUT data drops below 50°/sec and Alarm 2
to trigger when filtered GYRO_OUT data changes by more
than 50°/sec over a 100 ms period, or 500°/sec
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. There is no need to program
ALM_SMPL1 because Alarm 1 is a static alarm in this example.
Table 27. Alarm Configuration Example 1
DIN
0x9911,
0x98AF
0x930F,
0x92A0
0x910F,
0x90A0
0x9666
Filtering applies to GYRO_OUT only.
Description (Default = 0x0000)
Alarm 2 source selection
0000 = disable
0001 = GYRO_OUT (does not include GYRO_OUT2)
0010 = TEMP_OUT
0011 = DIAG_STAT
Alarm 1 source selection (same as Alarm 2)
Rate-of-change enable for Alarm 2
(1 = rate of change, 0 = static level)
Rate-of-change enable for Alarm 1
(1 = rate of change, 0 = static level)
Comparison polarity for Alarm 2
(1 specifies >ALM_MAG2, 0 specifies <ALM_MAG2)
Comparison polarity for Alarm 1
(1 specifies >ALM_MAG1, 0 specifies <ALM_MAG1)
Comparison data filter setting
(1 = Bartlett filter, 0 = no filtering)
Alarm output enable
(1 = enabled, 0 = disabled)
Alarm output polarity
(1 = active high, 0 = active low)
Alarm output line select
(1 = DIO2, 0 = DIO1)
Description
ALM_CTRL = 0x11AF
Alarm 2: dynamic; Δ-GYRO_OUT
(Δ-time, ALM_ SMPL2) > ALM_MAG2
Alarm 1: static; GYRO_OUT < ALM_MAG1
use filtered data source for comparison
DIO2 output indicator, positive polarity
ALM_MAG2 = 0x0FA0, (+50°/sec)
ALM_MAG1 = 0x0FA0, (+50°/sec)
ALM_SMPL2[7:0] = 0x66 (102 samples)
1
2
ADIS16135
. The filter