Hello everyone, I am debugging a board with communication between STM32F767 and ADS1299. Now I meet some problem. My ADS1299 is using internal reference and configure as bipolar supplies. I initial the system as the datasheet says. I write the 0xE0 to CONFIGURE3 and delay for almost 1s. But the VREFP is still -2.5v and the voltage conversion is 0x00. The register can be wrote and read correctly. I don't know why. Can someone help me, thank you.