UCD9081 EVM not detected

Yiding Luo

Other Parts Discussed in Thread: UCD9081

Hello Team,

I am using the UCD9081 EVM evaluate the part but it is having an issue with the USB adapter interface not registering on the PCB so cannot control the board. The GUI says that no EVM attached and plugging in to multiple USB ports on multiple computers yields the same results.

Could you please help to solve the issue?

Thanks,

Yiding

over 8 years ago

0 Zhiyuan Hu over 8 years ago

TI__Genius 9845 points

UCD9081 only supports 100kHz PMBus. You will need to adjust the USB-to-GPIO dongle's operation frequency from 400kHz to 100kHz. This can be done with Fusion Digital Power GUI, under File-> USB Adapter Setting.

0 Catalin Palade over 8 years ago in reply to Zhiyuan Hu

Prodigy 180 points

Are there any updates to the USB-to-GPIO dongle driver (any OS...????) to be able to connect to the 9081EVM. I scoped the I2C_CLK and Data on the EVM and there is no I2C activity (100K or 400K) when the dongle is connected to the EVM.

0 Zhiyuan Hu over 8 years ago in reply to Catalin Palade

TI__Genius 9845 points

Are the I2C lines high or low? When there is no communication, I2C lines should be pulled high. The adapter has a few pull up resistor values options.

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UCD9081 EVM not detected