Monitoring electrode voltages in an implantable medical device system having daisy-chained electrode-driver integrated circuits

An implantable stimulator device, comprising:

• a first integrated circuit comprising a plurality of first electrodes configured to provide stimulation pulses to a patient's tissue via at least one lead;
• a second integrated circuit comprising a plurality of second electrodes configured to provide stimulation pulses to the patient's tissue via the at least one lead;
• and
• control circuitry configured to program any of the first and second electrodes as an anode for the stimulation pulses and configured to program a different any of the first and second electrodes as a cathode for the stimulation pulses,
• wherein the second integrated circuit comprises measurement circuitry configured to select and receive a voltage at the anode and a voltage at the cathode.