A circuit comprising: a first channel comprising: a first external terminal; and a first lower resolution analog-to-digital converter, LRADC, configured to perform a first analog-to-digital, A-D, conversion of a first analog signal received at the first external terminal to a first digital value; a second channel comprising: a second external terminal configured to receive a second analog signal; a channel selector coupled to a plurality of channels, the plurality of channels comprising at least the first channel and the second channel, each channel includes a corresponding external terminal, the channel selector having an output to provide a selected analog signal from a corresponding external terminal of a selected channel; a higher resolution analog-to-digial converter, HRADC, coupled to the output of the channel selector and configured to perform an analog-to-digital conversion of the selected analog signal, wherein the first LRADC has a lower resolution as compared to the HRADC; and a controller coupled to the channel selector and configured to control the channel selector to select the selected channel to provide the selected analog signal to the HRADC, wherein the controller schedules for selection the selected channel based on the first digital value, wherein scheduling a channel for selection comprises: when the first digital value indicates a change in value of the first analog signal, the controller is configured to schedule the first analog signal for selection in order to provide a second A-D conversion of the first analog signal by the HRADC to a second digital value; and when the first digital value by the first LRADC indicates no change in value of the first analog signal, the controller is configured to periodically provide the second analog signal to the HRADC such that the HRADC periodically performs an A-D conversion of the second analog signal, in which performance of the A-D conversion of the second analog signal by the HRADC is not based on any lower resolution A-D conversion. a first channel comprising: a first external terminal; and a first lower resolution analog-to-digital converter, LRADC, configured to perform a first analog-to-digital, A-D, conversion of a first analog signal received at the first external terminal to a first digital value; a first external terminal; and a first lower resolution analog-to-digital converter, LRADC, configured to perform a first analog-to-digital, A-D, conversion of a first analog signal received at the first external terminal to a first digital value; a second channel comprising: a second external terminal configured to receive a second analog signal; a channel selector coupled to a plurality of channels, the plurality of channels comprising at least the first channel and the second channel, each channel includes a corresponding external terminal, the channel selector having an output to provide a selected analog signal from a corresponding external terminal of a selected channel; a higher resolution analog-to-digial converter, HRADC, coupled to the output of the channel selector and configured to perform an analog-to-digital conversion of the selected analog signal, wherein the first LRADC has a lower resolution as compared to the HRADC; and a controller coupled to the channel selector and configured to control the channel selector to select the selected channel to provide the selected analog signal to the HRADC, wherein the controller schedules for selection the selected channel based on the first digital value, wherein scheduling a channel for selection comprises: when the first digital value indicates a change in value of the first analog signal, the controller is configured to schedule the first analog signal for selection in order to provide a second A-D conversion of the first analog signal by the HRADC to a second digital value; and when the first digital value by the first LRADC indicates no change in value of the first analog signal, the controller is configured to periodically provide the second analog signal to the HRADC such that the HRADC periodically performs an A-D conversion of the second analog signal, in which performance of the A-D conversion of the second analog signal by the HRADC is not based on any lower resolution A-D conversion. when the first digital value indicates a change in value of the first analog signal, the controller is configured to schedule the first analog signal for selection in order to provide a second A-D conversion of the first analog signal by the HRADC to a second digital value; and when the first digital value by the first LRADC indicates no change in value of the first analog signal, the controller is configured to periodically provide the second analog signal to the HRADC such that the HRADC periodically performs an A-D conversion of the second analog signal, in which performance of the A-D conversion of the second analog signal by the HRADC is not based on any lower resolution A-D conversion.