Programmable drive sense unit
A programmable drive-sense unit (DSU) includes a drive-sense circuit operably coupled to a load, wherein the drive-sense circuit is configured to drive and simultaneously to sense the load via a single line, and produce an analog output based on the sensing the load. The programmable DSU also includes an analog to digital circuit operably coupled to the drive-sense circuit, where the analog to digital circuit is operable to generate a digital output based on the analog output and in accordance with one or more programmable operational parameters to achieve one or more of load sensing objectives associated with the sensing of the load and data processing objectives associated with the sensing of the load.
1. A programmable drive-sense unit (DSU) comprising:
a drive-sense circuit operably coupled to a load, wherein the drive-sense circuit is configured to:
drive and simultaneously to sense the load via a single line; and
produce an analog output based on the sensing the load;
an analog to digital circuit operably coupled to the drive-sense circuit, wherein the analog to digital circuit is operable to:
generate a digital output based on the analog output and in accordance with one or more programmable operational parameters to achieve one or more of load sensing objectives associated with the sensing of the load, and data processing objectives associated with the sensing of the load; and
a processing module operably coupled to one or more of the drive-sense circuit and the analog to digital converter, wherein the processing module is configured to generate the one or more programmable operational parameters based on one or more inputs.
2. The programmable DSU of claim 1 , wherein the load sensing objectives comprise one or more of:
a signal to noise ratio;
a sensitivity;
a bandwidth;
a sampling rate; and
a power.
3. The programmable DSU of claim 1 , wherein the drive-sense circuit further comprises:
a comparator configured to produce the analog output signal based on comparison of a reference signal to a drive-sense signal, wherein the reference signal is received at a first input of the comparator, and the drive-sense signal is received at a second input of the comparator, and wherein the second input is coupled to the single line.
4. The programmable DSU of claim 3 , wherein the drive-sense circuit further comprises:
a feedback circuit operably coupled to the comparator and configured to process the analog output to generate a control signal; and
a dependent current supply operably coupled to the feedback circuit and configured to generate the drive-sense signal based on the control signal and to provide the drive-sense signal via the single line.
5. The programmable DSU of claim 4 , wherein the programmable operational parameters comprise one or more of:
a number of reference signals;
a waveform for at least one of the reference signals;
a frequency for at least one of the reference signals;
a phase for at least one of the reference signals;
a gain of the feedback circuit; and
a scaling factor of the dependent current supply;
a number of clock signals;
a waveform for at least one of the clock signals; and
a frequency for at least one of the clock signals.
6. The programmable DSU of claim 1 further comprises:
a digital filtering circuit operably coupled to a clock circuit and the analog to digital converter, wherein the digital filtering circuit produces filtered data based on the digital output in accordance with first clock signals from the clock circuit; and
a data processing circuit operably coupled to the clock circuit and the digital filtering circuit, wherein the data processing circuit produces output data based on the filtered data in accordance with second clock signals from the clock circuit.
7. The programmable DSU of claim 6 , wherein the programmable operational parameters comprise one or more of:
a number of filtering stages to activate;
a number of filter coefficients;
a frequency for a rate of the output data;
a number of the first and second clock signals;
a waveform for at least one of the clock signals; and
a frequency for at least one of the clock signals.
8. The programmable DSU of claim 1 , wherein an input of the one or more inputs comprises one of:
a command from another processing module;
previous output data from the programmable DSU;
a load sensing objective of the load sensing objectives; and
a data processing objective of the data processing objectives.
9. The programmable DSU of claim 1 , wherein the one or more load sensing objectives are based on one or more of:
a number of loads, wherein the loads include the load;
a type of the sensing performed by the load; and
a nature of the sensing performed by the load.
10. The programmable DSU of claim 9 , wherein the type of sensing comprises one or more of:
a self capacitance;
a mutual capacitance;
an impedance;
a voltage;
a current;
a frequency response; and
tuning for a desired frequency.
11. The programmable DSU of claim 9 , wherein the nature of the sensing comprises one or more of:
a touch;
a hover;
a movement;
a vital parameter regarding a human; and
an environmental parameter.
12. The programmable DSU of claim 1 further comprising:
a digital filtering circuit operably coupled to the analog to digital circuit, wherein the digital filtering circuit is configured to filter the digital output in accordance with one or more of the data processing objectives and the load sensing objectives to produce filtered data regarding the sensing of the load.
13. The programmable DSU of claim 12 , wherein a data processing objective of the data processing objectives comprises one of:
a filter bandwidth;
a filter coefficient;
a filter slew rate;
a number of filter taps;
a filter center frequency; and
an oversampling ratio.
14. The programmable DSU of claim 12 further comprising:
a data processing circuit operably coupled to the digital filter circuit, wherein the data processing circuit generates output data based on the filtered data in accordance with desired characteristics for the output data.
15. The programmable DSU of claim 14 , wherein the desired characteristics for the output data comprises one or more of:
an output value type;
an output data format; and
an output data rate.
16. The programmable DSU of claim 1 further comprises:
a digital to analog circuit operably coupled to the analog to digital circuit and the drive-sense circuit, wherein the digital to analog circuit is configured to generate a control signal based on the digital output, and wherein the drive-sense circuit is configured to generate a drive-sense signal for the driving and simultaneously sensing the load on the single line based on the control signal.
17. A programmable drive-sense unit (DSU) comprising:
a drive-sense circuit operably coupled to a load, wherein the drive-sense circuit is configured to:
drive and simultaneously to sense the load via a single line; and
produce an analog output based on the sensing the load in accordance with a first set of programmable operational parameters;
an analog to digital circuit configured to:
generate a digital output based on the analog output and in accordance with a second set of programmable operational parameters;
a digital filtering circuit configured to:
generate filtered data based on the digital output and in accordance with a third set of programmable operational parameters; and
a data processing circuit configured to:
generate output data based on the filtered data in accordance with a fourth set of programmable operational parameters.
18. The programmable DSU of claim 17 , wherein the programmable operational parameters comprise one or more of:
a number of reference signals;
a waveform for at least one of the reference signals;
a frequency for at least one of the reference signals;
a phase for at least one of the reference signals;
a gain of a feedback circuit;
a scaling factor of a dependent current supply;
a number of filtering stages to activate;
a number of filter coefficients;
a frequency for a rate of the output data;
a number of clock signals;
a waveform for at least one of the clock signals; and
a frequency for at least one of the clock signals.
19. The programmable DSU of claim 17 , wherein a programmable operational parameter of one or more of the first, second and third sets of programmable operational parameters is the same for each set of first, second and third sets of programmable operational parameters that includes the programmable operational parameter.