Silicon Anomaly High Accuracy, Dual-Axis
Digital Inclinometer and Accelerometer
ADIS16209 This anomaly list describes the known bugs, anomalies, and workarounds for the ADIS16209.
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. Anomalous Start-up Behavior [er001]
Background Issue Workaround Related Issues The ADIS16209 uses a number of internal functions (accelerometer, A/D, D/A, I/O, clock, reference) to produce highly
accurate tilt angles, with respect to gravity. Once the power supply level reaches +2.35 V, the ADIS16209 begins its poweron sequence to start each of these functions. The ADIS16209 uses an internal processor core and firmware to facilitate
this power-on sequence.
On a small percentage of units that have Date Code 1233 (or lower), the start-up process occasionally exhibits behaviors
that preclude correct inclinometer function and supply measurements. The observable symptoms include (but are not
limited to) the following:
•
SUPPLY_OUT < 1 V (when VCC = +3.0 V to 3.3 V)
•
STATUS[0] = 1, indicating the low-supply error condition
•
Incorrect XINCL_OUT, YINCL_OUT measurements
Investigation of this phenomenon has found that the anomalous start-up behavior depends on external power supply
configurations and the source impedance they present to the ADIS16209. When experiencing these behaviors, review the
application design for opportunities to lower the source impedance of the power supply (situational improvements in
power trace routing and/or bypass have eliminated this behavior). Units that have a Date Code of 1234 (or higher) use …