CC3200 crystal operation

Sebeom Rho

Other Parts Discussed in Thread: CC3200

Hello,

I designed some board using CC3200 refrenced from evaluation board schematic. Our schematic is attached. There is no signal in the 32kHz and 40MHz crystal after power up. I can see the clk from evaluation board at the same condition. I don't know what is the problem. Pls see our schematic attached if there are some missing point.

Thanks, SebeomWDL3000 _ 01.pdf

over 10 years ago

0 Joseph Gigi over 10 years ago

TI__Guru* 85400 points

Hi,

We will check and get back to you.

Regards,
Gigi Joseph.

0 Prajay Madhavan over 10 years ago

TI__Genius 11120 points

There are couple of things missing on your board.
There needs to be pull-up and pull-down for the serial flash. (100k pull-up for CS# and 100k pull-downs for CLK and data)
The pull-down on SOP2 has to be 2.7K or lower.
Ensure that the nRESET pin is held high (near Vcc)
Ensure that the power supply never dips below 2.1V.
Monitor the supply on C6 after the nRESET is released. It should stabilize at around 1.8V without any dips.

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CC3200 crystal operation