ADG715 Ack issue, but scope trace looks ok

Hello all,

I am having some difficulty getting the ADG715 channels to turn on. I am sending 0x90 (1001 0000) followed by switch configuration, please, refer to scope image. According to the datasheet, page 13, it looks like the ADG715 is not acknowledging the packet of data. SDA is 1 after the address data has been sent but should be 0.

My circuit configuration is:

  • VSS, A0 and A1 are tied to ground.
  • Reset line 3V3, via 10k resistor
  • VDD = 3V3, with 100nF capacitor

ADG715 Scope Pic

Does anyone from the community have any suggestions?

Regards,
Aaron