Magnetic-field sensor with test pin for control of signal range and/or offset

An integrated circuit (IC) comprising:

• a magnetic-field sensor comprising:
• a first magnetoresistance circuitry configured to receive a magnetic field signal from a target, and configured to convert the magnetic field signal received to a first channel signal;
• a second magnetoresistance circuitry configured to receive the magnetic field signal from the target, and configured to convert the magnetic field signal received to a second channel signal;
• analog circuitry configured to receive the first and second channel signals, and configured to provide a first analog output signal and a second analog output signal;
• digital circuitry comprising a first analog-to-digital converter (ADC) and a second ADC, the digital circuitry configured to receive the first analog output signal and, using the first ADC, configured to convert the first analog output signal to a first digital signal representing a first channel output signal, the digital circuitry further configured to receive the second analog output signal and, using the second ADC, configured to convert the second analog output signal to a second digital signal representing a second channel output signal, the digital circuitry further configured to provide an output signal of the IC at a first pin of the IC, wherein the output signal of the first pin indicates a speed and rotational direction of the target;
• and
• diagnostic circuitry configured to receive, from the digital circuitry, an input signal related to the first and/or the second digital signals, and configured to provide a test signal at a second pin of the IC,
• wherein in response to a range parameter, the diagnostic circuitry is configured to provide the test signal comprising a range of codes from the first and/or the second ADC corresponding to the range parameter,
• wherein the range parameter is used to select a full range of codes equal to 2x−1, where x is at least equal to 16, and
• wherein the range parameter is used to select a range of codes equal to the full range of codes divided by 2n, where n is less than x.

An integrated circuit (IC) comprising:

• a magnetic-field sensor comprising:
• a first magnetoresistance circuitry configured to receive a magnetic field signal from a target, and configured to convert the magnetic field signal received to a first channel signal;
• a second magnetoresistance circuitry configured to receive the magnetic field signal from the target, and configured to convert the magnetic field signal received to a second channel signal;
• analog circuitry configured to receive the first and second channel signals, and configured to provide a first analog output signal and a second analog output signal;
• digital circuitry comprising a first analog-to-digital converter (ADC) and a second ADC, the digital circuitry configured to receive the first analog output signal and, using the first ADC, configured to convert the first analog output signal to a first digital signal representing a first channel output signal, the digital circuitry further configured to receive the second analog output signal and, using the second ADC, configured to convert the second analog output signal to a second digital signal representing a second channel output signal, the digital circuitry further configured to provide an output signal of the IC at a first pin of the IC, wherein the output signal of the first pin indicates a speed and rotational direction of the target;
• and
• diagnostic circuitry configured to receive, from the digital circuitry, an input signal related to the first and/or the second digital signals, and configured to provide a test signal at a second pin of the IC,
• wherein in response to a range parameter, the diagnostic circuitry is configured to provide the test signal comprising a range of codes from the first and/or the second ADC corresponding to the range parameter,
• wherein the input signal is a first input signal,
• wherein the digital circuitry comprises channel separation circuitry,
• wherein the diagnostic circuitry is further configured to receive, from the digital circuitry, a second input signal related to a separation of the first channel output signal and the second channel output signal,
• wherein the diagnostic circuitry comprises:
• a multiplexor;
• and
• target assessment diagnostic circuitry,
• wherein the second input signal related to a separation of the first channel output signal and the second channel output signal is sent from the channel separation circuitry to the target assessment diagnostic circuitry,
• wherein the IC and the target are separated by a distance,
• wherein the target is a gear-toothed target having a plurality of teeth,
• wherein with the multiplexor in a first state and in response to the diagnostic circuitry receiving the first input signal from the digital circuitry, the diagnostic circuitry is configured to provide the test signal indicating whether the distance between the magnetic-field sensor and the target, spacing between the teeth and shape of the teeth, comply with at least one rule, and
• wherein with the multiplexor in a second state and in response to a range parameter and an offset parameter, the diagnostic circuitry is configured to provide the test signal comprising a range of codes from the first and/or the second ADC corresponding to the range and offset parameters.