Part Number:UCD9090
Hi
i'm trying to program UNC9090 device for prominent customers. According to i2c/PMBus interface specification i send address of device and command (f.e. to get ID i send 0x68 and 0xfd ). But whatever i do i get ACK for address and NACK for command. If i change resistors and therefor address, the device sends NACK to old address and ACK to new one. So device "understands" me. I have changed the frequency, gaps between the frames. The same result.
i also noticed some strange thing. If i set PMBus_CLK to input during response (ACK/NACK) from device, then sometimes i lose 9th clock fro command frame (address frame is OK).
Have you any advice?
Thank you very much.
