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ADIS16489 Datasheet(PDF) 29 Page - Analog Devices

Part # ADIS16489
Description  Seven Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16489 Datasheet(HTML) 29 Page - Analog Devices

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Data Sheet
ADIS16489
Rev. B | Page 29 of 40
Alarm Indicator
FNCTIO_CTRL[11:8] provide three configuration options for
using one of the DIOx lines as an alarm indicator: on/off,
polarity, and DIOx line. The primary purpose this signal is to
provide an output signal that activates when a bit in the SYS_
E_FLAG register = 1 (see Table 16). For example, use the
following sequence to establish DIO3 as a negative polarity alarm
indicator, while preserving the factory default setting for the data
ready function:
1. Turn to Page 3 (DIN = 0x8003)
2. Set FNCTIO_CTRL[7:0] = 0x0D (DIN = 0x860D).
3. Set FNCTIO_CTRL[15:8] = 0x0A (DIN = 0x870A).
GENERAL-PURPOSE I/O CONTROL (GPIO_CTRL)
Table 154. GPIO_CTRL Register Definitions1
Page
Addresses
Default
Access
Flash Backup
0x03
0x08, 0x09
0x00X0
R/W
Yes
1
The GPIO_CTRL[7:4] bits reflect the logic levels on the DIOx lines and do not
have a default setting.
Table 155. GPIO_CTRL Bit Definitions1
Bits
Description
[15:8]
Don’t care
7
General-Purpose I/O Line 4 (DIO4) data level
6
General-Purpose I/O Line 3 (DIO3) data level
5
General-Purpose I/O Line 2 (DIO2) data level
4
General-Purpose I/O Line 1 (DIO1) data level
3
General-Purpose I/O Line 4 (DIO4) direction control
(1 = output, 0 = input)
2
General-Purpose I/O Line 3 (DIO3) direction control
(1 = output, 0 = input)
1
General-Purpose I/O Line 2 (DIO2) direction control
(1 = output, 0 = input)
0
General-Purpose I/O Line 1 (DIO1) direction control
(1 = output, 0 = input)
1
The GPIO_CTRL[7:4] bits reflect the logic levels on the DIOx lines and do not
have a default setting.
When FNCTIO_CTRL does not configure a DIOx pin, GPIO_
CTRL provides register controls for general-purpose use of the
pin. GPIO_CTRL[3:0] provide input/output assignment
controls for each line. When the DIOx lines are inputs, monitor
their level by reading GPIO_CTRL[7:4]. When the DIOx lines
are used as outputs, set their level by writing to GPIO_CTRL[7:4].
For example, use the following sequence to set DIO1 and DIO3
as high and low output lines, respectively, and set DIO2 and DIO4
as input lines. Turn to Page 3 (DIN = 0x8003) and set GPIO_
CTRL[7:0] = 0x15 (DIN = 0x8815, then DIN = 0x8900).
MISCELLANEOUS CONFIGURATION (CONFIG)
Table 156. CONFIG Register Definitions
Page
Addresses
Default
Access
Flash Backup
0x03
0x0A, 0x0B
0x00C0
R/W
Yes
Table 157. CONFIG Bit Definitions
Bits
Description
[15:8]
Not used
7
Linear g compensation for gyroscopes (1 = enabled)
6
Point of percussion alignment (1 = enabled)
[5:2]
Not used
1
Real-time clock, daylight savings time (1: enabled, 0:
disabled)
0
Real-time clock control (1: relative/elapsed timer mode,
0: calendar mode)
The CONFIG register (see Table 156 and Table 157) provides
configuration options for the linear g compensation in the
gyroscopes (on/off), point of percussion alignment for the
accelerometers (on/off), and the real-time clock function.
Point of Percussion
CONFIG[6] offers a point of percussion alignment function that
maps the accelerometer sensors to the corner of the package
identified in Figure 32. To activate this feature, turn to Page 3
(DIN = 0x8003), then set CONFIG[6] = 1 (DIN = 0x8A40,
DIN = 0x8B00).
PIN 1
PIN 23
POINT OF PERCUSSION
ALIGNMENT REFERENCE POINT.
SEE CONFIG[6].
Figure 32. Point of Percussion Reference Point
Linear Acceleration on Effect on Gyroscope Bias
The ADIS16489 includes first-order compensation for the linear g
effect in the gyroscopes, which uses the following model:
+
×
=
ω
ω
ω
A
A
A
LG
LG
LG
LG
LG
LG
LG
LG
LG
ω
ω
ω
ZPC
YPC
XPC
Z
Y
X
33
32
31
23
22
21
13
12
11
ZC
YC
XC
The linear g correction factors, LGXY, apply correction for linear
acceleration in all three directions to the data path of each
gyroscope (ωXPC, ωYPC, and ωZPC) at the rate of the data samples
(2460 SPS when using the internal clock). CONFIG[7] provides an
on/off control for this compensation. The factory default value for
this bit activates this compensation. To turn it off, turn to Page 3
(DIN = 0x8003) and set CONFIG[7] = 0 (DIN = 0x8A40, DIN =
0x8B00). This command sequence also preserves the defaultsetting
for the point of percussion alignment function (on).


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