I am trying to bring up an AD7124-8 to measure a 3-Write RTD. I have tried many configurations, but have not managed to read any values from the data register, nor banish all errors from the error register.
All reads from the DATA register always return 0. All reads from the STATUS register always show the IDLE/RDY bit as high, and the error bit is high if I enable enough errors.
I have 1 PT100 RTD connected to the RTD1 input as pictured. All other RTDs connections are left floating.
REGCAPA = 1.92V
REGCAPD = 1.795V
REFIN+ - REFIN- = 1.21V
AIN2 - AIN1 = 398 mV
0x00,0x000000c0 0x01,0x00000081 0x02,0x00000000 0x03,0x00003505 0x04,0x00000000 0x05,0x00000014 0x06,0x00000080 0x07,0x0007fbda 0x08,0x00000000 0x09,0x00008022 0x0a,0x00000001 0x0b,0x00000001 0x0c,0x00000001 0x0d,0x00000001 0x0e,0x00000001 0x0f,0x00000001 0x10,0x00000001 0x11,0x00000001 0x12,0x00000001 0x13,0x00000001 0x14,0x00000001 0x15,0x00000001 0x16,0x00000001 0x17,0x00000001 0x18,0x00000001 0x19,0x000009e4 0x1a,0x00000860 0x1b,0x00000860 0x1c,0x00000860 0x1d,0x00000860 0x1e,0x00000860 0x1f,0x00000860 0x20,0x00000860 0x21,0x00060180 0x22,0x00060180 0x23,0x00060180 0x24,0x00060180 0x25,0x00060180 0x26,0x00060180 0x27,0x00060180 0x28,0x00060180 0x29,0x00800000 0x2a,0x00800000 0x2b,0x00800000 0x2c,0x00800000 0x2d,0x00800000 0x2e,0x00800000 0x2f,0x00800000 0x30,0x00800000 0x31,0x00554f25 0x32,0x00554f25 0x33,0x00554f25 0x34,0x00554f25 0x35,0x00554f25 0x36,0x00554f25 0x37,0x00554f25 0x38,0x00554f25
Any support is appreciated!