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CC2652R: CC2652 Custom Board CPU not running, 48MHz Oscillator not working

ak
Prodigy 20 points
Part Number: CC2652R
Other Parts Discussed in Thread: LAUNCHXL-CC26X2R1,

Hi,

I have designed a custom board around CC2652R1F chip , please see the schematic : 

Issue Description: 

When I upload the example sketch (Project Zero from SimpleLink™ CC13x2 and CC26x2 software development kit) ,it uploads successfully with following messages on Console: 

Cortex_M4_0: GEL Output: Memory Map Initialization Complete.

Cortex_M4_0: GEL Output: Board Reset Complete.

But after uploading the code successfully, Play / Run button does not appears in CCS and break point does not reaches at Main function.

Also The TI Starter Phone App does not show anything in bluetooth scan., Upon probing the main 48MHz oscillator using Oscilloscope, I figured it out that it is not working (not oscillating) and no sine wave appears on any of the Oscillator pins (i.e. X48M_N/46 and X47M_P/47). But If i probe the Y2 oscillator pins of LAUNCHXL-CC26X2R1 Kit, then I can see 48MHz sine wave on both oscillator pins.

Initially I thought it maybe a bad crystal issue,  So I removed the crystal from LAUNCHXL-CC26X2R1 kit and installed the crystal on my custom CC2652R board but still the issue remains same. That is no oscillation on Crystal pins and code does not work / runs.

However the same example code works fine on LAUNCHXL-CC26X2R1 Kit, but it does not works on my custom designed CC2652R board.

Voltages measured on my Board:

VDDS  is 3.29V 

VDDR is 1.67V

Manufactured Part Number on My Board:


Questions: 

1. Is there any issue in my scheme ?

2. What maybe the reason that can prevent: 48MHz from oscillating ?

3. What maybe the reason that prevent code to reach main break point?

Regards,

  • 0
    TI__Mastermind 27145 points

    Hi ,

    We don't recommend to put the test lead on the Crystal pins. Please refer to SWRA640 for Crystal Frequency measurement and tuning procedure.

    Did you check the Orientation of your Crystal?

    I see that you don't have External Loading Caps on the Crystal ( 48MHz), you need to tune Cap Array value for better frequency accuracy. You can use SmartRF Studio.

    Did you try with SmartRF Studio?

    Please request design review by using the following link. One of our engineer will contact you to get the design files from you for a complete review.

    Thanks,

    PM

  • 0 in reply to PM
    Prodigy 20 points

    Hi PM,

    Thank you so much for your quick reply. Please find below answers/comments to your questions / suggestions:

    We don't recommend to put the test lead on the Crystal pins. Please refer to SWRA640 for Crystal Frequency measurement and tuning procedure.

    Answer: I am using oscilloscope test leads in 10x mode. So I think it should not hurt the crystal operation very much. I also did oscilloscope test with  LAUNCHXL-CC26X2R1 kit but it still works fine. The oscillator works, the code example work on the kit.

    Did you check the Orientation of your Crystal?

    Answer: Yes checked the orientation, land pattern and please note that the schematic symbol, land pattern used in my design for crystal and cc2652 chip are from TI reference design. 

    I see that you don't have External Loading Caps on the Crystal ( 48MHz), you need to tune Cap Array value for better frequency accuracy. You can use SmartRF Studio.

    Answer: I did not use external loading capacitor because the TI Launchpad kit reference design also does not uses any external loading capacitors in Schematic and PCB.

    Did you try with SmartRF Studio?

    Answer: No i have yet not tried SmartRF studio because the CC2652 chip is not working on my board. The code seems to be not running / executing.

    Please request design review by using the following link. One of our engineer will contact you to get the design files from you for a complete review.

    Answer: Ok, i will submit my design review.

     

    Regards

  • 0 in reply to ak
    TI__Mastermind 27145 points

    Hi,

    OK, when you submit for design review request then one of engineer will contact you and they will help you in resolving your issue.

    So, I want to close this thread.

    Thanks,

    PM