We'd like to use both reference sources (REF1, REF0) on the ADS1261, as well as AC excitation. This is so that we can reconfigure our reference from one of two sources in software (while still using AC excitation).
Unfortunately, the REF1 pins (REF1P, REF1N) share the same pins as ACX1_N, ACX2_N (negated), and in two-wire mode the negated ACX1/2 are used - it looks like we cannot access AC excitation and use the second reference.
However, four-wire excitation mode enables ACX1, ACX2 (not negated) on different pins, and GPIO_CON seems to allow us to disconnect the GPIO (used for AC excitation) from certain pins.
I was wondering if we could go into 4-wire excitation mode (CHOP[1:0] = 11), and use GPIO_CON[:] to disconnect the GPIO from ACX1_N, ACX2_N (AIN2, AIN3), and use a gate-driver or similar to drive excitation using just ACX1, ACX2.
Thanks.
