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LMK03328: unused-pins & EVM

Satoshi Yoshida
Prodigy 660 points
Part Number: LMK03328
Other Parts Discussed in Thread: CODELOADER, , USB2ANY, TICSPRO-SW

Hi team,
Please allow me to ask you some questions from our customer as below,

1.
We can see the description in the datasheet as below,

(P.47 - 48 in the datasheet of LMK03328)
->  Outputs 0 and 1 share an output supply (VDDO_01), as well as outputs 2 and 3 (VDDO_23). Outputs 4, 5, 6, and 7 have individual output supplies (VDDO_4, VDDO_5, VDDO_6, VDDO_7). Each output supply can be independently set to 1.8 V, 2.5 V, or 3.3 V. When a particular output is desired to be disabled, the bits [5:0] in the corresponding output control register (R31, R32, R34, R35, R37, R39, R41, or R43) should be set to 0x00. If any of outputs 4, 5, 6, and 7 and their output dividers are disabled; their corresponding supplies can be connected to GND.

 I understand that VDDO_23 can be connected to GND when output 2&3 are disabled, is it correct?

2.
Could you advise me the treatment of SECREF_P/_N in the case of non-used secondary reference clock.?

3.
Is LMK03328EVM supported by both CodeLoader and TICSPRO vis USB2ANY?


Best regards,
Satoshi

  • 0
    TI__Mastermind 28550 points
    Hello Satoshi-san,

    1) My understanding is that you cannot connect VDDO_23 to ground when outputs 2&3 are disabled. Only VDDO4/5/6/7.
    > I'll double check with someone else.

    2) Leave unused SECREF floating and program SECBUFSEL = 0x03 (disabled).

    3) It is supported by both CodeLoader and TICSPRO-SW by USB2ANY. I recommend using TICS Pro.

    73,
    Timothy
  • 0 in reply to Timothy T
    TI__Prodigy 660 points
    Hi Timothy-san,
    Could you have double check for the question#1?
    Please let us know if you already have the result.

    Best regards,
    Satoshi
  • 0 in reply to Satoshi Yoshida
    TI__Mastermind 32575 points

    Satoshi-san,

    If output channels powered down through register control, VDDO_23 can be tied to the supply rail and it will consume almost no current.  Therefore, it is not necessary to pull-down the VDDO_23 pin to GND (through a weak pull-down resistor) or float the VDDO_23 pin if you've already disabled the channel through register control.

    Regards,
    Alan