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CC2652R: Custom board with CC2652R1: How to connect reset button.

VV
Intellectual 640 points
Part Number: CC2652R


Hi,

I am designing my own PCB board using the CC2652R1. I have a few questions regarding the connection of some pins.

1. How do I connect the nReset pin? Do I need to connect it?

2. What pins do I use to load my programm onto my microcontroller?  (cJTAG?)

3. Is it necessary to connect an external oscillator or can I just use the internal oszillator?

4. I could not import the Inverted_Antenna.dxf file into eagle, so I had to draw it myseld, but there were some distances and an angle missing. I am not suer if I missed somthing.

  • 0
    TI__Guru**** 317180 points

    1) You should have the reset pin available on the debug connector since our software tools use this line.  

    2) You can use 2- or 4 pin JTAG to program the chip. 

    3) Are you here referring to the 32 KHz xtal or a 24 MHz xtal? 

    4) W2 should be the width you need in your design to get a 50 ohm line. Use 45 degree angle.

  • 0 in reply to TER
    Intellectual 640 points

    1) So I can connect it to the debugger. But If I don't want to use the debugger anymore after I have finisched programming. What do I do then? Do I still need the capacitor and the resistor. or can I leave the pin floarting or pull it up to the supply voltage?

    2) Thanks. :)

    3) I would like to use jst internal clocks. Is that possible? Or is it strickly advisable to use an external clock (any of them)?

    4) So is L9 not important or L10 ? I realised that the branch where the angle is, does not start directly at the corner of L7 and L6 but overlaps

  • 0 in reply to VV
    TI__Guru**** 317180 points

    1) You need the RC network so ensure that you still are in reset while the power ramp on. 

    3) No, RF requires a xtal

    4) I would open the gerber files for on of the ref designs that uses this antenna and measure in a gerber viewer. 

  • 0 in reply to TER
    Intellectual 640 points

    Hi,

    1) Can you be more precise? I have never designed a board before unsing a MCU. So it the pin should be low, when zwitching on the device, but then go high? Do you have an example for such a circuit?

    3) Do you meen an xtal of 48MHz? I couldn't find this hint in any of the documents. So would it be enough to connect the XTAL 48MHz (CX2016DB48000C0FPLC1). I think this one was used on the development board aswell. Or do I also need the 32.768 (FC-135 32.7680KA-AG0)?

    4) What programm do you suggest to open and measure the gerber file? I would be so much easier, if the document was complete.

  • 0 in reply to VV
    TI__Guru**** 317180 points

    1) Follow the reference design

    3) Yes, the 48 MHz xtal. The answer depends on what you are going to use the chip for. The chip has a 32 kHz RC osc and can use this but it depends on the accuracy you need, typically for sleep. 

    4) It exist a fair amount of gerber viewers, I use gerbv