AD9542 Eval Board I2C jumper settings

HI,

The table 4 from the wiki refers to how to connect the USB chip to the AD9542. You are right that if you have your own controller and want to manage the AD9545 through I2C, you need to use the P512 connector. Take out P506 and P507, so you take out any influence of the USB chip. 

You need to have 1K pull ups on  the SDA and SCL lines between the controller and the AD9542 because the AD9545 rev C data sheet does not state there are any internal pull ups on the AD9542.

Then, you need to manipulate M4, M5 and M6 pins as follows:

• M4 must be connected to VDD for the AD9545 to use I2C
  • P605 M4 jumper between 1 and 2 (middle pin and VDD)
• M5 and M6 pins must be connected to GND, so the AD9545 has the I2C address 0x48
  • P605 M5 pin jumper between 5 and 6 (middle pin and GND)
  • P605 M6 pin jumper between 8 and 9 (middle pin and GND)

Set M5 and M6 function of what AD9542 I2C address you need. I considered them being connected to ground.

Petre

Hi Petre, I now want to avoid using a 3.3 to 1.8 level shifter for the external I2C master.

It seems possible if I follow the all but the first step in the wiki for powering directly from the ADP2384A:

• [DO NOT] Install P802 (sets switcher output voltage to 1.8 V)
• Install P712/P728 (connects switcher output to VDD_DUT_EXT & VDD_DUT_IO_EXT)
• Change P704/P725/P727 to pins 2/3 (connects VDD_DUT & VDD_DUT_IO/VDD_MPIN to VDD_DUT_EXT & VDD_DUT_IO_EXT)
• Change P701/P721/P729 to pins 2/3 (disables LDOs that are being bypassed)

Would this work?

Thanks, Steve

Luckily, I did not do this and spotted the error of my ways (VDD is 1.89V max). VDDIOA and B are OK at 3.3V.

So, I made jumpers P712, P728 (linking SW_OUT @ 3.3V, to VDD_DUT_EXT and on to VDD_DUT_IO_EXT) and swapped P725 and P727 to pins 2-3 to make VDDIOA and VDDIOB link to VDD_DUT_IO_EXT.

Hi Petre,

I faced the same issue. The settings in Table 4 of the AD9545 user guide are wrong.
Could you please correct since other users will waste their time to find the right settings.

Thanks,
Sven

HI,

I changed it. Please take a look and tell me if you agree with the new settings:

https://wiki.analog.com/resources/eval/ad9545-user-guide#serial_port_configuration_pins

Petre

Hi Petre,

I agree with your changes in the draft. 

Thanks,
Sven