Thank you for your prompt response, Gordon. It is good to know this quirk of the software I2C, I will change my code to rely on the hardware I2C instead, for now. Does the Software I2C object accept arguments to disable internal pullup feature when the External Device already has Pullup resistors? This would be ideal for some of my work. I will get back to testing my custom pcb, I designed a small hat for the MDBT42Q breakout board to interface with a texas instument LDC3114 chip and add analog output capability utilizing a MCP4725 DAC. both of these chips are on a I2C bus. Thanks again!
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