System and method for mems sensor system synchronization
AssigneeInvenSense, Inc.
InventorsAndy Milota, James Lim, William Kerry Keal
Life of this patent
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Abstract
Various aspects of this disclosure comprise systems and methods for synchronizing sensor data acquisition and/or output. For example, various aspects of this disclosure provide for achieving a desired level of timing accuracy in a MEMS sensor system, even in an implementation in which timer drift is substantial.
Claims19
1-23. (canceled)
An integrated sensor having an adjustable sensor output data rate (ODR), wherein the sensor has an internal sensor sync clock, is configured to output measurements at an ODR established by the internal sensor sync clock, and comprises a processor operable to, at least:
- receive a first sync signal from an external source;
- receive a second sync signal from the external source;
- determine, based at least in part on the internal sensor sync clock, a time differential between the received first sync signal and the received second sync signal;
- determine an adjustment to the ODR based, at least in part, on the determined time differential;
- and
- modify operation of the sensor by applying the determined adjustment to the ODR, so that subsequent sensor measurements are provided at the adjusted ODR.
A method for adjusting a sensor output data rate (ODR), wherein measurements from a sensor are output at an ODR established by the internal sensor sync clock of the sensor, comprising:
- receiving a first sync signal from an external source;
- receiving a second sync signal from the external source;
- determining, based at least in part on the internal sensor sync clock, a time differential between the received first sync signal and the received second sync signal;
- determining an adjustment to the ODR based, at least in part, on the determined time differential;
- and
- modifying operation of the sensor by applying the determined adjustment to the ODR, so that subsequent sensor measurements are provided at the adjusted ODR.
A portable device comprising:
- a host processor;
- an external clock source;
- and
- an integrated sensor having an adjustable sensor output data rate (ODR), wherein the sensor has an internal sensor sync clock, is configured to output measurements at an ODR established by the internal sensor sync clock, and comprises at least one sensor processor operable to, at least:
- receive a first sync signal from the external clock source;
- receive a second sync signal from the external clock source;
- determine, based at least in part on the internal sensor sync clock, a time differential between the received first sync signal and the received second sync signal;
- determine an adjustment to the ODR based, at least in part, on the determined time differential;
- and
- modify operation of the sensor by applying the determined adjustment to the ODR, so that subsequent sensor measurements are provided at the adjusted ODR to the host processor.
Dependencies are inferred from the claim text.