ADIS16209 Analog Devices, Inc., ADIS16209 Datasheet - Page 14

• Manufacturer Part Number: ADIS16209
• Description: High-accuracy, Dual-axis Digital Inclinometer And Accelerometer
• Manufacturer: Analog Devices, Inc.

ADIS16209
contents of the output data registers and loads the equal but
opposite number into the offset calibration registers. The
accuracy of this operation depends on zero force, zero motion,
and optimal noise management during the measurement (see
the Digital Filtering section). The factory calibration restore sets
the offset null registers (XACCL_NULL, for example) back to
their default values.
CALIBRATION REGISTERS
The ADIS16209 incorporates an extensive factory calibration
and provides precision acceleration, incline, and rotational
position data. For systems that require on-site calibration,
user-programmable offset adjustment registers are available.
Table 16 provides the bit assignments for the following user-
programmable calibration registers: XACCL_NULL and
YACCL_NULL. Table 17 provides the bit assignments for
the following user-programmable calibration registers:
XINCL_NULL, YINCL_NULL, and ROT_NULL.
Table 16. Acceleration Offset Register Bit Designations
Bit
15:12
11:0
Table 17. Incline/Rotation Offset Register Bit Designations
Bit
15:14
13:0
ALARM REGISTERS
The alarm function provides monitoring for two independent
conditions. The ALM_CTRL register provides control inputs
for data source, data filtering (prior to comparison), static/
dynamic, and output indicator configurations. The ALM_MAGx
registers establish the trigger threshold and polarity configura-
tions. The ALM_SMPLx registers provide the numbers of
samples to use in the dynamic, rate-of-change configuration.
The rate-of-change calculation is
where:
N
y(n) is the sampled output data.
M
> or < is determined by the MSB in ALM_MAGx.
Table 18. ALM_MAG1/ALM_MAG2 Bit Designations
Bit
15
14
13:0
Y
C
DS
C
is the magnitude for comparison in ALM_MAGx.
=
is the number of samples in ALM_SMPLx.
N
1
DS
Comparison polarity: 1 = greater than, 0 = less than
Description
Not used
Data bits, twos complement, sensitivity = 0.244 mg/LSB
Description
Not used
Data bits, twos complement, sensitivity = 0.025°/LSB
Description
Not used
Data bits, matches format of trigger source selection
N
∑
n
DS
=1
y
(
n
+
) 1
−
y
(
n
)
⇒
Alarm
⇒
is
Y
(Default = 0x0000)
(Default = 0x0000)
(Default = 0x0000)
C
>
or
<
M
C
?
Rev. PrA | Page 14 of 16
Table 19. ALM_SMPL1/ALM_SMPL2 Bit Designations
Bit
15:8
7:0
Table 20. ALM_CTRL Bit Descriptions
Bit
15
14:12
11
10:8
7:6
5
4
3
2
1
0
Status
The STATUS register provides a series of error flags, which
provide indicator functions for common system-level issues. All
of the flags clear (set to 0) after each STATUS register read
cycle. If an error condition remains, then the error flag returns
to 1 during the next sample cycle.
Table 21. STATUS Bit Descriptions
Bit
15:10
9
8
7:6
5
4
3
2
1
0
Description
Not used
Alarm 2 status
Alarm 1 status
Not used
Self-test diagnostic error flag
Not used
SPI communications failure
Flash update failed
Power supply above 3.625 V
Power supply below 2.975 V
Value
000
001
010
011
100
101
110
111
Description
Not used
Data bits: number of samples (both 0x00 and 0x01 = 1)
1 = active, 0 = inactive
1 = active, 0 = inactive
1 = error condition, 0 = normal operation
1 = error condition, 0 = normal operation
1 = error condition, 0 = normal operation
1 = >3.625 V, 0 = <2.975 V (normal)
1 = <2.975 V, 0 = >2.975 V (normal)
Description
Alarm 2 rate of change control: 1 = enabled
Trigger source, Alarm 2
Alarm 1: rate-of-change control, 1 = enabled
Trigger source, Alarm 1, same as bits 14:12
Not used
Alarm 2 filter: 1 = filtered data, 0 = no filter
Alarm 1 filter: 1 = filtered data, 0 = no filter
Not used
Alarm indicator, using DIO1/DIO2: 1 = enabled
Alarm indicator polarity: 1 = active high
Alarm indicator line select: 1 = DIO2, 0 = DIO1
Rotational position
Preliminary Technical Data
Disabled
Power supply
X-acceleration
Y-acceleration
Temperature sensor
X-axis incline angle
Y-axis incline angle
(Default = 0x0001)
(Default = 0x0000)
(Default = 0x0000)