Patent ID: 8754793

Claim:
An apparatus, comprising: a first terminal; a second terminal; a first multiplexer having a first input, a second input and an output; a second multiplexer having a first input, a second input and an output; a device having a first input, a second input, an output, a first oscillator, and a second oscillator, said device being configured to convert a time period to a digital value; evaluation logic coupled to the output of said device; wherein the first input of said first multiplexer is coupled with the first terminal, the second input of said first multiplexer is coupled with the output of said first oscillator, the output of said first multiplexer is coupled with the first input of said device; and wherein the first input of said second multiplexer is coupled with the second terminal, the second input of said second multiplexer is coupled with the output of said second oscillator, and the output of said second multiplexer is coupled with the second input of said device.