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LMK05318B: Startup modes

Hailiang Zhang
Genius 13600 points

Part Number: LMK05318B

Tool/software:

Hi Expert,

The customer is asking us to customize the firmware according to his clock needs, and they will pre-burn it in their own factory. In this case, does HW_SW_CTRL have to be tied low, right?

Regards，
Hailiang

  • 0
    Intellectual 711 points

    Right, pull HW_SW_CTRL low to load eeprom setup at reset and use i2c bus for control/monitoring. Most common use case I think.

    But it depends on the control method, i2c or spi.

    • float: eeprom + spi
    • low: eeprom + i2c

    If you fully rely on the eeprom configuration in a controller-less setup, then the HW_SW_CTRL may be left floating or tied low. 

    Reference: LMK05318B datasheet SNAS801B, Table 6-2

  • 0
    TI__Genius 17250 points

    Hi Hailiang, 

    I agree with Octo's comment, HW_SW_CTRL can be pulled low or left floating to boot from EEPROM. 

    Regards, 

    Connor