Method and apparatus for multi-channel sensor interface with programmable gain, offset and bias

1. A system, comprising:

a plurality of circuits configured to generate a corresponding plurality of input signals;

a signal conditioner configured to condition the plurality of input signals; and

a controller configured to control the signal conditioner;

wherein:

the controller generates one or more control signals for the controlling of the signal conditioner; and

the signal conditioner:

selects one or more input signals from the plurality of input signals, based on a first control signal from the one or more control signals generated by the controller;

generates an adjustment signal based on an second control signal from the one or more control signals; and

adjusts at least one of the selected one or more input signals based on the adjustment signal and a third control signal from the one or more control signals.

2. The system of claim 1 , wherein the signal conditioner comprises a multiplexer configured to select one input signal based on the first control signal from the one or more control signals.

3. The system of claim 2 , wherein the multiplexer comprises a differential multiplexer.

4. The system of claim 1 , further comprising a plurality of adjustment registers configured to store adjustment values, with each adjustment register corresponding to a respective input signal from the plurality of input signals.

5. The system of claim 1 , wherein the signal conditioner is configured to generate adjustment values with both polarity.

6. The system of claim 1 , wherein the signal conditioner is configured to provide a number of selectable gains for use in adjusting input signals.

7. The system of claim 1 , comprising an interface circuit configured to enable interfacing with the signal conditioner.

8. The system of claim 7 , wherein the interface circuit comprises an I2C serial digital interface based circuit.

9. The system of claim 8 , wherein the controller comprises a slave I2C serial digital interface.

10. The system of claim 1 , wherein the controller is configured to generate a mode control signal that is configured to control or adjust one or more characteristics of input signals to the signal conditioner.

11. The system of claim 10 , wherein the controller is configures the mode control signal to cause a voltage applicable to at least one input to the signal conditioner to be proportional to a current applied in at least one other circuit in the system.

12. The system of claim 1 , further comprising a regulator that regulates power supply to at least one other circuit in the system.

13. The system of claim 12 , wherein the signal conditioner is configured to select between at least one input signal and a signal from the regulator.

14. The system of claim 1 , further comprising an analog to digital converter (ADC) for converting an analog output signal of the signal conditioner to a digital output.

15. The system of claim 1 , further comprising a comparator that compares an output of the signal conditioner with a reference signal, and provides an output that is configured for use in performing adjustment correction to the selected input signal.

16. The system of claim 15 , wherein the signal conditioner is configured to set or modify at least one adjustment based on an output of the comparator.