Hi everyone,
I am trying to get CC Debugger to establish a connection to a CC2540 chip in a very basic circuit to be able to download software onto it using IAR.
For the moment I just want to be able to connect to my CC2540. I tried to rebuild the circuit shown in the CC2540 manual "Figure 22. CC2540 Application Circuit". However when connecting to the CC Debugger the led stayed red, i.e. no connection could be established. I then tried to simplify the setup and use only the most necessary components.
Now I have this simple setup:
- Pins 4, 10, 21, 24, 27, 28, 29, 31, 39 of CC2540 connected to Pins 2 & 9 on the 10-pin connector (Voltage supply by Debugger)
- Pin 1 of CC2540 connected to Pin 1 of 10-pin connector (Ground)
- Pin 40 of CC2540 connected to 1µF capacitor (through hole) and then to ground (Pin 1 of 10-pin connector)
- Pin 30 of CC2540 connected to 56K resistor (through hole) and then to ground (Pin 1 of 10-pin connector)
- Pin 23,24 of CC2540 connected to pins 1, 3 of FA-128 32MHz crystal (10pF loading) and then connected to (Pin 1 of 10-pin connector). Pins 2&4 of the crystal connected to ground.
And for the connection to the debugger:
- As said power is connected to pins 2 and 9 of 10 pin connector and ground to pin 1.
- Pin 20 of CC2540 connected to Pin 7 of 10-pin connector (Reset)
- Pin 34 of CC2540 connected to Pin 3 of 10-pin connector (DC)
- Pin 35 of CC2540 connected to Pin 4 of 10-pin connector (DD)
I am assuming this should be enough for the CC Debugger to establish a connection with the CC2540?
I have my CC2540 on an "QFN-40 to DIP-40 SMT" adapter. The connection should be ok since the reference voltages on the chip (pin 30 @ 1.25V, pin 40 @ 1.8V) are ok.
Still I cannot establish a connection to the CC Debugger - the led always stays red after reset.
Is there anything else I am missing that is required for the operation of the CC2540? Or is there anything else I can do to check my setup?
Any help would be greatly appreciated!
