AWR2243: SPI clock levels between host board and BOOST eval board

Jacob Mackay

Part Number: AWR2243

G'day everyone,

We're trying to interface with the AWR2243 chip and program it over SPI, but are having many troubles. Currently, we're using a host board with output lines connected to the BOOST eval board for testing.

When we try SPI write from the host board, the clock signal (yellow) varies between 0-3 V:

Photo of analyser when only connected to host. SPI clock signal (yellow) goes between 0-3 V.

When the BOOST board is connected the clock signal now goes between 1-2 V:

Photo of analyser when connected to host and BOOST board. SPI clock signal (yellow) goes between 1-2 V.

As you can see, the clock signal changes level between the two photos. This could disrupt the interpretation of high and low states. Any assistance in debugging this issue would be much appreciated!

Cheers,

Jacob

over 2 years ago

0 Jacob Mackay over 2 years ago

Prodigy 30 points

Also for reference, when nothing is connected the clock line remains constant at 1.8 V. Is this to be expected?

0 Abhed Misra over 2 years ago in reply to Jacob Mackay

TI__Genius 13805 points

Hi,

I can't make out the difference between the 2 images. can you please point where do you see the voltage change? If it does drop to 1.8V does the communication still go through?

In the default state is the HOST board connected? Is this behavior also evident on other IO's.

Regards

0 Jacob Mackay over 2 years ago in reply to Abhed Misra

Prodigy 30 points

Hi Abhed,

The differences are as follows. When boost is not connected, host behaves as expected and the clock signal varies between 0 and 3 V:

When the boost is connected, the clock signal is dragged to 1-1.8 V:

When there is nothing connected, the boost shows an idle clock signal at 1.8 V as seen in the third photo: e2e.ti.com/.../20230213_5F00_160804.jpg

In regards to the other IOs, the blue, light blue and pink traces show expected behaviour, sitting at ground or 3 V.

Cheers,

Jacob

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AWR2243: SPI clock levels between host board and BOOST eval board