Desired Register Set

* uint16_t raw_voltage; // 32.
* uint8_t error_state; // 33. 0 = no errors.
* can be turned on to dispatch an event if the error state changes
* uint8_t dispatch_events; // 34
* bit0: turn on error_state event dispatch
* uint16_t voltage_dispatch_frequency_hz; // 35
* 0 to disable, nonzero to dispatch the raw_voltage register