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About twatts

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  1. Hello, I am trying to communicate with an MCP4441 chip using the I2C interface and using an Aardvark I2C cable from Total Phase. I am trying to read the registers which have non-zero default values (2,3,8,9), but always get back 0. It appears from the data sheet for the part that the control byte should be 0x59 is A1:A0 = 00 (see attached page from datasheet) I have attached scope captures of SCL and SDA when I tried setting the write and read address to 0x59 and 0x2c. Both of these attempts read back 0. Any ideas on what I am doing wrong? Thanks.
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