LMK05028: DCO FDEV for 2 loop: TCXO, APLL

Satoshi Yone

Part Number: LMK05028

Hi, Team,

For "2 loop: TCXO, APLL", could you please let me know how to change the DCO FDEV by software during the device is working? Is it ok just to change DPLLy_FDEV_REG_UPDATE register or is there any sequence for that?

Best Regards,
Satoshi Yone

over 6 years ago

0 Timothy T over 6 years ago

TI__Mastermind 28560 points

Hello Yone-san,

Yes, once you setup the step size as per 9.4.4.1 of datasheet, all you need to do is program the DPLLy_FDEV_REG_UPDATE.

You may consider disabling pin inputs:

DPLL1_IGNORE_GPIO_PIN = 1
DPLL1_IGNORE_GPIO_PIN = 1
GPIO3_FDEV_EN = 0
GPIO4_FDEV_EN = 0
GPIO5_FDEV_EN = 0
GPIO6_FDEV_EN = 0

73,
Timothy

0 Satoshi Yone over 6 years ago in reply to Timothy T

TI__Expert 3600 points

Thanks! I will post additional question.

Best Regards,
Satoshi Yone

0 Timothy T over 6 years ago in reply to Satoshi Yone

TI__Mastermind 28560 points

Thanks for posting new questions in a separate thread when appropriate for clarity.

73,
Timothy

Clock & timing

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LMK05028: DCO FDEV for 2 loop: TCXO, APLL