I am trying to read the voltage on monitor pin 1 of the UCD90124 using a PICCOLO F28027 controlSTICK through the PMBUS line. I have tried sending the PAGE and READ_VOUT commands but the UCD90124 does not respond, all I get is the alert let turned on. Does anybody have a sample on code on how to read voltages from the UCD90124.
Here is a link to a document which covers PMBus command tranactions between MSP430 and UCD9112 Power Controller which should be similar.
Obviously the command codes would be different, I'm going to move this thread to the sequencer section of the forum where the UCD90124 is handled and you should get additional assistance.
Digital Power is for the UCD92xx/UCD3xxx power controllers.
Sequencer I/F docs can be accessed via http://software-dl.ti.com/analog/analog_public_sw/fusion/doc/?DCMP=hpa_pmp_general&HQS=NotApplicable+OT+fusiondocs
See specifically, http://software-dl.ti.com/analog/analog_public_sw/fusion/doc/UCD90xxx_PMBus_Command_Reference.pdf for command reference and
http://software-dl.ti.com/analog/analog_public_sw/fusion/doc/Configuration%20Programming%20of%20UCD%20Devices.pdf for interface via external uP.
Best bet is to get a TI EVM and use the Fusion GUI (many, many scripting tools) and then emulate what it does.
Thank you for your fast response. I have already managed to send write commands to the UCD90SEQ64EVM through the PMBus. Nevertheless when I am trying to read values using the read byte command READ_VOUT, after the read bit from the send byte sequence, is sent the board does not return stop command and my SCL is held LOW.
Are the files mentioned the document available [slaa386.zip?]
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