Saleh, [quote userid="593855" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1431288/amc131m03-spi-communication-with-the-device/5503965#5503965"]It's recommended to configure the device before sending in the CLKIN signal, but it should still work with the CLKIN already present.[/quote] You are correct. I delayed the CLKIN signal, and it made no difference. [quote userid="593855" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1431288/amc131m03-spi-communication-with-the-device/5503965#5503965"]What change did you make to get DOUT from the device? [/quote] I believe it was poor solder joint or connection. I took all my probes off and then carefully re-connected them, and the DOUT signal showed up after that. [quote userid="593855" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1431288/amc131m03-spi-communication-with-the-device/5503965#5503965"]One thing to note is that you should be sending at least 5 words per command:[/quote] Found one mistake in my WREG command. The CRC (or zero when disabled) should follow the command and I had it at the end of my. Here is my config of MODE, CLOCK and GAIN registers after power up: I get 0x4083 in response and send command to enable DC/DC: Then getting what seems like correct response 0x5880, but no CRC in the output. Next, I am sending 0xB880 to request status: As you can see no change in DCDC_OUT or HLDO_OUT. Next CLKIN is enabled, and I send null command. The status is returned as 0x0100 and again no CRC in the response: After that I get 0x0740 in response to each null request: [quote userid="593855" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1431288/amc131m03-spi-communication-with-the-device/5503965#5503965"]Is the DCDC_OUT voltage changing at all?[/quote] As you can see from my captures there is no even attempt to enable DCDC_OUT at any point in my power up sequence. I would like to confirm that I am sending correct commands before I start removing parts from my board to verify current draw. Thanks,
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