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US 2016/0103002 A1Published application
System and method for mems sensor system synchronization
AssigneeInvenSense, Inc.
InventorsAndy Milota, James Lim, William Kerry Keal
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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.
Claims23
A system for synchronizing sensor data, the system comprising:
- at least one module operable to, at least:
- during normal operation, attempt to acquire and store sensor information at a regular target output data rate (ODR) with a target period T;
- acquire and store a first sensor value at a first time;
- receive an ODR sync signal;
- in response to the received ODR sync signal acquire and store a second sensor value at a second time that is less than the first time plus the target period T.
2 more elements
A system for synchronizing sensor data, the system comprising:
- at least one module 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 an internal sensor sync clock, a time differential between the received first sync signal and the received second sync signal;
- determine an adjustment to the internal sensor sync clock based, at least in part, on the determined time differential and an expected time differential.
2 more elements
A system for synchronizing sensor data, the system comprising:
- at least one module operable to, at least:
- first communicate a first sync signal to a sensor circuit;
- after said first communicate, receive a first counter value from the sensor circuit;
- second communicate a second sync signal to the sensor circuit;
- after said second communicate, receive a second counter value from the sensor circuit;
- determine, based at least in part on the first and second counter values from the sensor circuit, an adjustment to a clock circuit of the sensor circuit;
- and
- communicate information of the determined adjustment to the sensor circuit.
5 more elements
Dependencies are inferred from the claim text.