Resistive short circuit immunity for wheel speed sensor interface on braking system

An apparatus comprising:

• a first circuit for transmitting a first current to a wheel speed sensor;
• a second circuit for receiving a second current, some or all of which may be received from the wheel speed sensor;
• a first threshold detection circuit for generating a first periodic signal based on the first current;
• a second threshold detection circuit for generating a second periodic signal based on the second current;
• a circuit, wherein the circuit is configured for selecting the first periodic signal for output if a magnitude of the second current is greater than a magnitude of the first current, wherein the circuit is configured to select the second periodic signal for output if the magnitude of the second current is not greater than the magnitude of the first current;
• wherein the selected first or second periodic signal comprises information relating to a speed of a wheel that is associated with the wheel speed sensor.

A system comprising:

• a first circuit for generating a first periodic signal based on first current transmitted to a wheel speed sensor;
• a second circuit for generating a second periodic signal based on second current some or all of which is received from the wheel speed sensor;
• a circuit, wherein the circuit is configured for selecting the first periodic signal for output if a magnitude of the second current is greater than a magnitude of the first current, wherein the circuit is configured to select the second periodic signal for output if the magnitude of the second current is not greater than the magnitude of the first current;
• wherein the selected first or second periodic signal comprises information relating to a speed of a wheel that is associated with the wheel speed sensor.