ADIS16209CCCZ(Rev0) View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADIS16209CCCZ
(Rev.:Rev0)
(Rev.:Rev0)
Analog Devices
ADIS16209CCCZ Datasheet PDF : 16 Pages
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ADIS16209
The flash update copies the contents of all the flash backup
registers into their assigned, nonvolatile, flash memory loca-
tions. This process takes approximately 50 ms and requires a
power supply that is within the specified operating range. After
waiting the appropriate time for the flash update to complete,
verify successful completion by reading the STATUS register (if
successful, the flash update error is 0). If the flash update was
not successful, reading this error bit accomplishes two things:
(1) alerting the system processor to try again, and (2) clearing
the error flag, which is required for flash memory access.
The DAC data latch command loads the contents of AUX_DAC
into the DAC latches. Because the AUX_DAC contents must be
updated one byte at a time, this command ensures a stable DAC
output voltage during updates.
The autonull command provides a simple method for removing
offset from the sensor outputs. This command takes the
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 Description
(Default = 0x0000)
15:14 Not used
13:0 Data bits, twos complement, sensitivity = 0.24414 mg/LSB
Table 17. Incline/Rotation Offset Register Bit Designations
Bit Description
(Default = 0x0000)
15:14 Not used
13:0 Data bits, twos complement, sensitivity = 0.025°/LSB
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
N DS
∑ YC
=
1
N DS
y(n +1) − y(n) ⇒ Alarm ⇒ isYC > or < MC ?
n=1
where:
NDS is the number of samples in ALM_SMPLx.
y(n) is the sampled output data.
MC is the magnitude for comparison in ALM_MAGx.
> or < is determined by the MSB in ALM_MAGx.
Table 18. ALM_MAG1/ALM_MAG2 Bit Designations
Bit
Description
(Default = 0x0000)
15
Comparison polarity: 1 = greater than, 0 = less than
14
Not used
13:0 Data bits, matches format of trigger source selection
Table 19. ALM_SMPL1/ALM_SMPL2 Bit Designations
Bit
Description
(Default = 0x0001)
15:8 Not used
7:0
Data bits: number of samples (both 0x00 and 0x01 = 1)
Table 20. ALM_CTRL Bit Descriptions
Bit Value Description
(Default = 0x0000)
15:12
Trigger source, Alarm 2
0000
Disabled
0001
Power supply
0010
X-acceleration
0011
Y-acceleration
0100
Auxiliary ADC
0101
Temperature sensor
0110
X-axis incline angle
0111
Y-axis incline angle
1000 Rotational position
11:8
Trigger source, Alarm 1, same as Bits [15:12]
7
Not used
6
Alarm 2 rate of change control: 1 = enabled
5
Alarm 1 rate of change control: 1 = enabled
4
Alarm 2 filter: 1 = filtered data, 0 = no filter1
3
Alarm 1 filter: 1 = filtered data, 0 = no filter1
2
Alarm indicator, using DIO1/DIO2: 1 = enabled
1
Alarm indicator polarity: 1 = active high
0
Alarm indicator line select: 1 = DIO2, 0 = DIO1
1 Incline and vertical angles always use filtered data in this comparison.
Rev. 0 | Page 14 of 16
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