Datasheet ADIS16485 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Tactical Grade Six Degrees of Freedom MEMS Inertial Sensor |
| Seiten / Seite | 2 / 1 — Tactical Grade. Six Degrees of Freedom Inertial Sensor. Silicon Anomaly. … |
| Revision | 0, 9/2013 |
| Dateiformat / Größe | PDF / 65 Kb |
| Dokumentensprache | Englisch |
Tactical Grade. Six Degrees of Freedom Inertial Sensor. Silicon Anomaly. ADIS16485. PERFORMANCE ISSUES
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Tactical Grade Six Degrees of Freedom Inertial Sensor Silicon Anomaly ADIS16485
This anomaly list describes the known bugs, anomalies, and workarounds for the ADIS16485. Analog Devices, Inc., is committed, through future silicon revisions, to continuously improve silicon functionality. Analog Devices tries to ensure that these future silicon revisions remain compatible with your present software/systems by implementing the recommended workarounds outlined within this document.
PERFORMANCE ISSUES Table 1. Incorrect Scale Factors for the x_DELTANG_OUT and x_DELTANG_LOW Registers [er001] Background
The ADIS16485 provides delta angle registers that contain sample-to-sample angle displacement estimates for all three axes. The x_DELTANG_OUT registers provide the upper 16 bits, and the x_DELTANG_LOW registers provide the lower 16 bits. The x_DELTANG_OUT registers typically provide a scale factor of 720 ÷ 215 degrees per LSB, and the x_DELTANG_LOW registers provide additional resolution (720 ÷ 231 degrees per LSB).
Issue
On units that have firmware Revision 2.01 (or earlier), the delta angle registers do not have the same scale factors as those listed in the product data sheet. For these units, the scale factors are 274 ÷ 215 degrees per LSB for x_DELTANG_OUT and 274 ÷ 231 degrees per LSB for x_DELTANG_LOW.
Workaround
Use 274 ÷ 215 degrees per LSB for the x_DELTANG_OUT scale factor and 274 ÷ 231 degrees per LSB for the x_DELTANG_LOW scale factor. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Table 2. Incorrect Scale Factors for the x_DELTVEL_OUT and x_DELTVEL_LOW Registers [er002] Background
The ADIS16485 provides delta velocity registers that contain sample-to-sample velocity estimates for all three axes. The x_DELTVEL_OUT registers provide the upper 16 bits, and the x_DELTVEL_LOW registers provide the lower 16 bits. The x_DELTVEL_OUT registers typically provide a scale factor of 50 ÷ 215 mm/sec per LSB, and the x_DELTVEL_LOW registers provide additional resolution (50 ÷ 231 mm/sec per LSB).
Issue
On units that have firmware Revision 2.01 (or earlier), the delta velocity registers do not have the same scale factors as those listed in the product data sheet. For these units, the scale factors are 97.65 ÷ 215 mm/sec per LSB for x_DELTVEL_OUT and 97.65 ÷ 231 mm/sec per LSB for x_DELTVEL_LOW.
Workaround
Use 97.65 ÷ 215 mm/sec per LSB for the x_DELTVEL_OUT scale factor and 97.65 ÷ 231 mm/sec per LSB for the x_DELTVEL_LOW scale factor. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Table 3. Inaccurate TEMP_OUT Readings [er003] Background
The TEMP_OUT register provides the internal temperature measurement, which serves as an input to the inertial calibration outputs and provides a variable that enables users to monitor relative temperature changes inside of the unit.
Issue
On units that have firmware Revision 2.01 (or earlier), the TEMP_OUT bias error is −10°C, and the scale factor is approximately 5% lower than reflected in the ADIS16485 data sheet.
Workaround
Use devices that have firmware Revision 2.02 or later to benefit from the improvement in the TEMP_OUT accuracy. For specific in-application accuracy, users may want to consider their own calibration process because attachment, airflow, and other mechanical variables can impact the relationship of TEMP_OUT with ambient temperature conditions. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Performance Issues Anomaly Status
This anomaly list describes the known bugs, anomalies, and workarounds for the ADIS16485. Analog Devices, Inc., is committed, through future silicon revisions, to continuously improve silicon functionality. Analog Devices tries to ensure that these future silicon revisions remain compatible with your present software/systems by implementing the recommended workarounds outlined within this document.
PERFORMANCE ISSUES Table 1. Incorrect Scale Factors for the x_DELTANG_OUT and x_DELTANG_LOW Registers [er001] Background
The ADIS16485 provides delta angle registers that contain sample-to-sample angle displacement estimates for all three axes. The x_DELTANG_OUT registers provide the upper 16 bits, and the x_DELTANG_LOW registers provide the lower 16 bits. The x_DELTANG_OUT registers typically provide a scale factor of 720 ÷ 215 degrees per LSB, and the x_DELTANG_LOW registers provide additional resolution (720 ÷ 231 degrees per LSB).
Issue
On units that have firmware Revision 2.01 (or earlier), the delta angle registers do not have the same scale factors as those listed in the product data sheet. For these units, the scale factors are 274 ÷ 215 degrees per LSB for x_DELTANG_OUT and 274 ÷ 231 degrees per LSB for x_DELTANG_LOW.
Workaround
Use 274 ÷ 215 degrees per LSB for the x_DELTANG_OUT scale factor and 274 ÷ 231 degrees per LSB for the x_DELTANG_LOW scale factor. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Table 2. Incorrect Scale Factors for the x_DELTVEL_OUT and x_DELTVEL_LOW Registers [er002] Background
The ADIS16485 provides delta velocity registers that contain sample-to-sample velocity estimates for all three axes. The x_DELTVEL_OUT registers provide the upper 16 bits, and the x_DELTVEL_LOW registers provide the lower 16 bits. The x_DELTVEL_OUT registers typically provide a scale factor of 50 ÷ 215 mm/sec per LSB, and the x_DELTVEL_LOW registers provide additional resolution (50 ÷ 231 mm/sec per LSB).
Issue
On units that have firmware Revision 2.01 (or earlier), the delta velocity registers do not have the same scale factors as those listed in the product data sheet. For these units, the scale factors are 97.65 ÷ 215 mm/sec per LSB for x_DELTVEL_OUT and 97.65 ÷ 231 mm/sec per LSB for x_DELTVEL_LOW.
Workaround
Use 97.65 ÷ 215 mm/sec per LSB for the x_DELTVEL_OUT scale factor and 97.65 ÷ 231 mm/sec per LSB for the x_DELTVEL_LOW scale factor. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Table 3. Inaccurate TEMP_OUT Readings [er003] Background
The TEMP_OUT register provides the internal temperature measurement, which serves as an input to the inertial calibration outputs and provides a variable that enables users to monitor relative temperature changes inside of the unit.
Issue
On units that have firmware Revision 2.01 (or earlier), the TEMP_OUT bias error is −10°C, and the scale factor is approximately 5% lower than reflected in the ADIS16485 data sheet.
Workaround
Use devices that have firmware Revision 2.02 or later to benefit from the improvement in the TEMP_OUT accuracy. For specific in-application accuracy, users may want to consider their own calibration process because attachment, airflow, and other mechanical variables can impact the relationship of TEMP_OUT with ambient temperature conditions. Use the FIRM_REV register to determine the firmware revision of a unit. For example, FIRM_REV = 0x0201 equates to a firmware revision of 2.01.
Related Issues
None.
Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Performance Issues Anomaly Status