LMK05028: Changing the input from XO to INx

David Huang

Part Number: LMK05028

Hi team,

If the DPLL input is programmed into non-volatile memory to use the XO pin by default, how to change the input to INx pin instead?

Can this be programmed, or is achieved by external circuitry?

Regards

over 1 year ago

0 vicente flores prado over 1 year ago

TI__Mastermind 21561 points

Hi David,
If customer would want to change default input clock after having programmed EEPROM the customer would have to re-program the EEPROM to reflect this change.
LMK05028 supports up to 100 cycles of EEPROM config changes.

Regards,

Vicente

0 David Huang over 1 year ago in reply to vicente flores prado

TI__Intellectual 2285 points

Hi Vicente,

Thanks for the response. Adding several questions here.

1. The customer is considering re-program the EEPROM using I2C without TIC Pro GUI, is this possible? Is there a way to know the register address and description?

2. What happens if the EEPROM configure changes more than 100 cycles? Does this cause any malfunction to the device?

Regards,

0 vicente flores prado over 1 year ago in reply to David Huang

TI__Mastermind 21561 points

Hi David,
1. Have customer refer to section 9.5 of DS which goes over programming and register information. Programming information starts on page 67.

2. After 100 cycles, TI cannot guarantee DS performance. The more write cycles you perform on non-volatile memory, the more the EEPROM health degrades which affects storage integrity.

Regards,

Vicente

0 David Huang over 1 year ago in reply to vicente flores prado

TI__Intellectual 2285 points

Hi Vicente,

Thanks. Is it possible to export the GUI register setting to txt file or csv file?

vicente flores prado said:
If customer would want to change default input clock after having programmed EEPROM the customer would have to re-program the EEPROM to reflect this change.

Also, customer the customer wants to switch input from XO to INx while the device is locked to XO(When the device is working). Is there any way to achieve this?

Regards

0 vicente flores prado over 1 year ago in reply to David Huang

TI__Mastermind 21561 points

Hi David,

This is possible.

I understand the XO is used as a reference only in holdover mode when primary input is lost. When the device is locked and working, INx is used.

Regards,

Vicente

0 vicente flores prado over 1 year ago in reply to vicente flores prado

TI__Mastermind 21561 points

Sorry forgot to acknowledge your config question.
Yes, inside TICSpro GUI, you can export HEX register values as .txt file.

Regards,

Vicente

0 David Huang over 1 year ago in reply to vicente flores prado

TI__Intellectual 2285 points

Hi Vicente,

Thanks for the response.

With the GUI export function I only found register addresses as below, is there additional setting required for full register values?

R0 0x000000

R1 0x000100

R2 0x000200

R3 0x000300

R4 0x000400

R5 0x000500

R6 0x000600

R7 0x000700

R8 0x000800

R9 0x000900

R10 0x000A00

・

Regards,

0 vicente flores prado over 1 year ago in reply to David Huang

TI__Mastermind 21561 points

Hi David,
if all register values are 0, there is an issue with your configuration...
I loaded the EVM default configuration and exported the register values as .txt file without any issue.

Regards,

Vicente

Clock & timing

Clock & timing forum

LMK05028: Changing the input from XO to INx