CC1310

Fleishman Fleishman

Other Parts Discussed in Thread: CC1310

Hi,

We have working and stable system run on CC1310 .

We are working now to change the 24Mhz crystal osc and we want to understand how the osc start-up time is impact on the timing and scheduling.

Is the timed chain start after the osc stable ?
If yes , What the maximum osc start-up time that aloud ? is it configurable ?
If no, where in the chin the start-up time impact ?

For example our chain for Tx :

RF_Op* const rf_cmd_chain_tx[] =
{
(RF_Op*) &RF_cmdFs,
(RF_Op*) &RF_cmdSchImm_RF_cmdWriteFwpar,
(RF_Op*) &RF_cmdSchImm_RF_cmdSetTxPower,
(RF_Op*) &RF_cmdPropTx,
NULL,
};

To set RF command to RF core we are using :RF_postCmd

Please advice .

over 6 years ago

0 Fredrik K over 6 years ago

TI__Guru** 106705 points

Hi Yaki,

The RF driver will automatically account for the crystal start-up time. As long as you are using a crystal with specifications within the CC1310 requirements, you do not need to be concerned about the start-up time of the crystal..

Regards,
Fredrik

0 Fleishman Fleishman over 6 years ago in reply to Fredrik K

Intellectual 340 points

Hi Fredrik,

Thanks for your replay.

I understand your answer.

In the Datasheet section 5.19.3 Clock Specification write start-up time TYP - 150usec the Max and Min are not define .

Do you have this numbers ? especially the MAX .

We what to work with osc that have 250usec start-up time , Do you thing it is a problem ?

Do you have recommended way to test it ?

Yaki

0 Fredrik K over 6 years ago in reply to Fleishman Fleishman

TI__Guru** 106705 points

Hi Yaki,

The typical start-up time value in the datasheet is simply what is measured on our characterization board.

The RF driver accounts for worst case crystal specifications and operating conditions. 250 us start-up time is not a problem.

Regards,
Fredrik

0 Fleishman Fleishman over 6 years ago in reply to Fredrik K

Intellectual 340 points

Hi Fredrik ,

Can you describe the impact ,if there are ,of start-up time on timed Tx/Rx chain ?

It the RF driver normalizing the impact of temperature changing on start up time ?
We need to understand if and how the start-up time impact on our system .

Thanks

Yaki

0 Fredrik K over 6 years ago in reply to Fleishman Fleishman

TI__Guru** 106705 points

Hi Yaki,

There is sufficient margin in the RF driver to account for all worst-case conditions. There is no impact on system performance.

Regards,
Fredrik

0 Fleishman Fleishman over 6 years ago in reply to Fredrik K

Intellectual 340 points

Hi Fredrik ,

What is the worst-case ? What the maximum start-up time that RF driver support ?

Do you have document or link that explain how the RF driver handle the start-up time ?

Thanks

Yaki

0 Fredrik K over 6 years ago in reply to Fleishman Fleishman

TI__Guru** 106705 points

Yaki,

As long as you are using a crystal with specifications within the requirements listed in the CC1310 datasheet, there is nothing to be concerned about.

Regards,
Fredrik

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