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Original question:

CC1310 Minimum Required Circuit for Radio Use

CC1310: Related: Minimum Required Circuit for Radio Use

user4841079
Prodigy 80 points
Part Number: CC1310
Other Parts Discussed in Thread: SEGGER

Hello, 

Before I with my custom design (which will be based on the 5x5mm EVM reference design), I wanted to do a lab test (debugger connection and run) on a super-minimalistic board.

For this, I hand-soldered a CC1310F128RHB (5x5mm) to a QFN32 adapter PCB and and connected all decoupling caps and a 24MHz HC49 Crystal, as well as the 100K nReset resistor and the four jtag lines.

Also, I am using a 10uH inductor (0805) for the DCDC as I did not have the 6.8uH at hand.

Now, when I try to connect with a JLINK debugger, the JLINK connects via full JTAG (1000khz) and shows the registers and verifies that a CM3 core is present. Also, I can read out any memory.

However, I can neither flash nor run the part. XDC110 (from a CC1310 LAUNCHPAD) complains with a lot of "try resetting..." errors, and the JLINK doesn't flash either.

My question is now, what the issue might be... 

Referring to an older post: https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/554040?CC1310-Minimum-Required-Circuit-for-Radio-Use#pi320995=2

where TER states that:

The CC13xx family is not designed to be used without external components on the RF_P/N pins. Using the IPC from Johanson or Murata you are able to get a very small footprint with a 50 ohm interface. This is a fairly large antenna so why do you want to save a few square mm on the PCB?

I wanted to know whether it is really necessary to hook up the complete antenna-network to the RF-pins as well only to get be able to run the jtag debugger?

I have a lot of experience with playing around with Cortex M0 to M7 on adapter boards, and there was NEVER a single case where the part could not run at all, especially of the SEGGER jlink commander was able to verify the core.

NOTES:

The adapter PCB has very long traces so the distance to the crystal is quite long, and so is the distance to the decoupling caps, but in my experience this was never an issue (at least not when I ran a part with its initial BOR-settings which are usually the internal RC-resonator and now IO anyways.

I did not use a 32khz external RTC crystal, but this too should be irrelevant.

The voltage after the inductor is 1.62V, a bit lower than I expected but I guess the DCDC still works.

Would it make a difference to omit the internal DCDC and power the CC1310 from a single external DCDC or LDO?

Best Regards

AMK

  • 0
    TI__Guru**** 317180 points
    You write "For this, I hand-soldered a CC1310F128RHB (5x5mm) to a QFN32 adapter PCB and and connected all decoupling caps and a 24MHz HC49 Crystal, as well as the 100K nReset resistor and the four jtag lines."

    Does the adapter have a ground connection under the chip? I highly suspect that the way you have soldered on the chip and connected the external components are the reasons why you have issues connecting to the chip.