Hi Iance,
Sure, in our device datasheet under section 7.10.4.1.1 MCU_OSC0 Internal Oscillator Clock Source you should be able to find the recommended crystal circuit to implement the oscillator input in your design.
In the following subsections you should also be able to find details in how to calculate the required load capacitances and shunt capacitances for you application by using the provided formulas.
Best,
Daniel
Thank you for replying.
Unfortunately the example you have pointed me to is not a crystal but instead is an oscillator. The launch Pad design uses an Oscillator from Wurth Electronik 831055678
If you could review if there any designs which use the crystal as the datasheet show a crystal connection as shown in the diagram below
Sorry for the confusion!
You are correct, the Launchpad uses an oscillator. On the other hand, our GPEVM does use a 25MHz crystal that you can potentially use and follows a similar datasheet crystal design example that was shown before. this would be the ABM10W-25.0000MHZ-8-K1Z-T3 that you can find here:
https://www.digikey.com/en/products/detail/abracon-llc/ABM10W-25-0000MHZ-8-K1Z-T3/7172507
As a quick note:
Our devices are designed to support both Oscillators and Crystals as input clock to the SOC depending on resistor configurations. In its current implementation, you will see the following in the GPEVM schematic:
SOC_CLK_IN in the top left is providing the system clock from the same oscillator used in our LaunchPad design. If you would like to use the Crystal as input instead, the GPEVM would have to be modified to in order to populate R158 and R155 with 0ohm resistors and leave R161 as a DNI instead.
If you are not planning to use alternate clock sources then the 0-ohm resistors are not needed and the crystal terminals can be routed directly to the SOC, which would yield a schematic that resembles the one in the datasheet
You can follow the same procedure as before to download the schematic and BOM from our product page if you'd like to go and take a look at the documents yourself
Link to the GPEVM Product Page: https://www.ti.com/tool/TMDS243GPEVM?keyMatch=AM243%20GPEVM
Best,
Daniel
