Hi Kobena, I don't see any issue with your schematic that would cause this issue. One thing to note if you are using HART the 1uF capacitor across Loop+ and Loop- is too large and will attenuate the signal. If the DAC161S997 output is at one of the error current values, it means one of the error conditions is being met as described in section 8.4 of the datasheet. I would suspect it may be the watchdog timer as it is enabled by default. Can you provide captures of the SPI transmissions between your MCU and the DAC? Thanks, Garrett
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