System and method of power-saving in MEMS sensor applications
At least some of the embodiments are methods including detecting low user dynamics by a first MEMS sensor, determining a first sensor sampling rate value corresponding to the low user dynamics wherein the first sensor sampling rate value is less than a second sensor sampling rate value corresponding to high user dynamics, and adjusting a sampling rate of a second MEMS sensor to the first sensor sampling rate value.
1. A system comprising:
a plurality of sensors;
a first logic unit coupled to an output of at least one sensor of the plurality of sensors, the first logic unit estimating user dynamics in response to an output signal from the at least one sensor;
second logic unit coupled to the first logic unit, the second logic unit generating a sampling rate value of a first MEMS sensor in response to an output signal from the first logic unit, and wherein the first MEMS sensor comprises a selectable sampling rate and wherein the selectable sampling rate is selected in response to the generated sampling rate value.
2. The system of claim 1 further comprising a sensor processor, the sensor processor comprising the first logic unit and the second logic unit.
3. The system of claim 1 wherein:
the second logic unit comprises a sampling rate engine and a rate control generator, the sampling rate engine configured to receive the output signal from the first logic unit, and
the rate control generator coupled to the sampling rate engine and generating an output signal in response to the sampling rate value, and wherein the rate control generator output signal is coupled to the first MEMS sensor and configured to select a sampling rate of the first MEMS sensor.
4. The system of claim 2 wherein the sensor processor is configured to estimate a physical parameter using sensor data from at least two sensors of the plurality of sensors.
5. The system of claim 1 wherein the first sensor comprises a first ADC and a second ADC, and wherein selecting a sampling rate of the first sensor comprises selecting one of the first and second ADCs having the sampling rate value.
6. The system of claim 1 wherein the first sensor comprises an ADC, the ADC comprising a programmable sampling rate, and wherein the first sensor selectable sampling rate is selected in response to a programming value received from the second logic unit.
7. The system of claim 6 wherein a programming value of the programmable sampling rate comprises an n-bit binary value and wherein m least significant bits of the programming value received from the second logic unit are negated, and wherein m comprises a number of bits less than n.
8. The system of claim 4 wherein the physical parameter is selected from the group consisting of:
a yaw; and
a heading.