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Part Number: UCD9240

I am sending I2C commands to a UCD9240 from an FPGA on the Xilinx SP605 board.  I can send CLEAR_FAULTS and PAGE commands OK but when I send FREQUENCY_SWITCH the response is NACK even if I request the default frequency of 500 kHz.  I have a sensitive ADC attached to the FMC and I wish to implement a spread spectrum EMI reduction scheme to constantly sweep the frequency up and down by a few kHz.  I have tried preceding the FREQUENCY_SWITCH with PAGE 0x00 and PAGE 0xFF.  Every I2C command is bracketed with START and STOP.  I have tried varying the I2C clock.  The I2C driver supports clock stretch.

Thanks in advance,