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UCD9222的配置问题

Other Parts Discussed in Thread: UCD9222

大家好,我在配置UCD9222的时候发现当PMBus的 CNTRL管脚是3.3V的时候,PMBus adapter就找不到UCD9222了?请问这是为什么?原理图如下,我把FPGA和UCD9222的CNTRL管脚连接的电阻R321卸掉之后,PMBus adapter就连接不到UCD9222了,因为如果我不卸载这个电阻,PMBus adapter就不能讲CNTRL管脚拉高了,怎么办呢?哪里出问题了?求指导