ADIS16265ACCZ(RevPrA) 데이터 시트보기 (PDF) - Analog Devices
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ADIS16265ACCZ Datasheet PDF : 19 Pages
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Preliminary Technical Data
CALIBRATION
The ADIS16260/ADIS16265 are factory-calibrated for
sensitivity and bias. It also provides several user calibration
functions for simplifying field-level corrections. The calibration
factors are stored in nonvolatile memory and are applied using
the following linear calibration equation:
y = mx + b
where:
y is the calibrated output data.
x is the precalibration data.
m is the sensitivity scale factor.
b is the offset scale factor.
There are three options for system-level calibrations of the bias
in the ADIS16260/ADIS16265: auto-null, factory calibration
restore, and manual calibration updates. The auto-null and
factory reset options are described in the Global Commands
section. Optional field-level calibrations use the preceding
equation and require two steps:
1. Characterize the behavior of the ADIS16260/ADIS16265 at
predefined critical operating conditions.
2. Use this characterization data to calculate and load the
contents of GYRO_OFF (b) and GYRO_SCALE (m).
The GYRO_OFF provides a calibration range of ±37.5°/sec, and
its contents are nonvolatile. The GYRO_SCALE register
provides a calibration range of 0 to 1.9995, and its contents are
also nonvolatile.
Table 9. GYRO_OFF Register Definition
Address Scale1
Default Format
0x15,
0x14
0.018315°/sec 0x0000 Twos
complement
1 Scale is the weight of each LSB.
Access
R/W
Table 10. GYRO_OFF Bit Descriptions
Bit
Description
15:12
Not used
11:0
Data bits
Table 11. GYRO_SCALE Register Definition
Address
Scale1 Default2 Format
0x17, 0x16 0.0487% 0x0800 Binary
1 Scale is the weight of each LSB.
2 Equates to a scale factor of one.
Table 12. GYRO_SCALE Bit Descriptions
Bit
Description
15:12
Not used
11:0
Data bits
Access
R/W
ADIS16260/ADIS16265
GLOBAL COMMANDS
The ADIS16260/ADIS16265 provide global commands for
common operations such as auto-null, factory calibration
restore, manual flash update, auxiliary DAC latch, and software
reset. Each of these global commands has a unique control bit
assigned to it in the COMMAND register and is initiated by
writing a 1 to its assigned bit.
The auto-null function does two things: it resets the contents of
the ANGL_OUT register to zero, and it adjusts the GYRO_OUT
register to zero. This automated adjustment takes two steps:
1. Read GYRO_OUT.
2. Write the opposite of this value into the GRYO_OFF
register. Sensor noise influences the accuracy of this step.
For optimal calibration accuracy, set the number of filtering
taps to its maximum, wait for the appropriate number of
samples to process through the filter, and then exercise this
option.
The factory calibration restore command sets the contents of
GYRO_OFF to 0x0000 and GYRO_SCALE to 0x0800, erasing
any field-level calibration contents. The manual flash update
writes the contents of each nonvolatile register into flash
memory for storage. This process takes approximately 50 ms
and requires the power supply voltage to be within specification
for the duration of the event. It is worth noting that this
operation also automatically follows the auto-null and factory
reset commands.
The DAC latch command loads the contents of AUX_DAC into
the DAC latches. Since the AUX_DAC contents must be updated
one byte at a time, this command ensures a stable DAC output
voltage during updates. Finally, the software reset command
sends the ADIS16260/ADIS16265 digital processor into a restart
sequence, effectively doing the same thing as the RST line.
Table 13. COMMAND Register Definition
Address
Default
Format
0x3F, 0x3E
N/A
N/A
Access
Write only
Table 14. COMMAND Bit Descriptions
Bit Description
15:8 Not used
7 Software reset command
6:4 Not used
3 Manual flash update command
2 Auxiliary DAC data latch
1 Factory calibration restore command
0 Auto-null command
Rev. PrA | Page 13 of 19
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