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Crystal oscillator is not working

Ziting
Prodigy 160 points
Other Parts Discussed in Thread: CC2511, CC-DEBUGGER, CC2540

Hi all,

I'm a college student and I have a problem when using a CC2511 transceiver and a oscillator.

I purchased a CC2511 Dongle first and then I designed my own circuit. The schematic is almost the same as the CC2511 Dongle except my PCB does not have a USB interface. I powered my board with a power supply. I checked every pin of the CC2511 chip with a oscilloscope and they are all good. Those pins connected to power all have a 3.3V voltage. I also checked the traces between the pin and the oscillator with a multimeter and the connection is good too. But the oscillator is not working. When I checked the oscillator on the CC2511 Dongle with a oscilloscope, I can see a 48 MHz sine wave. I used the same crystal oscillator as it is recommended in the datasheet of the CC2511 transceiver. But it is not oscillated. What could possibly cause this problem?

Thank you.

  • 0
    TI__Genius 10955 points

    Have you programmed the CC2511 on your board? The 48 MHz oscillator is only started when enabled by software, so you need to program the flash with something that at least enables the oscillator.

  • 0 in reply to hec
    Prodigy 160 points

    I connected the chip with a CC Debugger to my computer. But my computer can not detect the chip. Is there any other way to program the flash?

    Thank you!

  • 0 in reply to Ziting
    TI__Genius 10955 points

    The only way to program the flash on a new chip is through the debug interface, so you need to get that working. Your problem description is not clear. Is the problem in the communication between the CC-debugger and the computer or between the CC2511 and the CC debugger? To find out, check if the CC debugger works with the dongle supplied by TI. Keep in mind that you need to power the dongle (from the USB connector) also when you have the debugger connected.

    By searching on this forum, you should be able to find many other posts on problems with the debugger, both getting the PC to recognize the debugger as a USB device and getting the debugger to recognize the chip. You can apply advice given for any of the 8051 based SoC's, that is CC111x, CC251x, CC243x, CC253x and CC2540. I hope that can help you in solving your problem.

    Edit: I now saw that you had posted the same problem in this thread http://e2e.ti.com/support/low_power_rf/f/155/t/113200.aspx. I guess from that thread it is clear that your problem is the communication between the debugger and your board. Please follow the advice from M, who is an expert on this topic. I suggest you keep follow-up posts on the debugger issue in that thread.

  • 0
    TI__Genius 14940 points

    Since you identify yourself as a student, I am not sure as to the soldering equipment you have at your disposal.  The reason I am discussing this is because the ground pad on the bottom of the chip MUST be connected as it is the only ground connection on the part.  You will at least need a hot plate and some solder paste to get this connection made.  Without it, you will never be able to communicate with the part.

    Are you be sure this connection is soldered properly?

    Jim Noxon