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LMK03328: About Soft pin Programming Mode

Y.Ottey
Mastermind 6145 points
Part Number: LMK03328

Dear all,

 Would you mind if we ask about Soft pin Programming Mode?

Our customer ask 3 questions like below.

 1.In the case of Soft pin programing mode, Which of following GPIO2's and GPIO3's setting is correct at start up?

(1)VIH=1.4V~ (2)VIM=0.9V (3)VIL=~0.4V　(4)No connection

2.The following description is given in Datasheet p.32 10.3.3.2 Soft Pin Programming Mode(HW_SW_CTRL=0).

http://www.ti.com/lit/ds/snas668d/snas668d.pdf

"The GPIO inputs[3:2] are sampled and latched at power-on reset (POR), and select one of 6 EEPROM pages which are custom-programmable. When GPIO[3:2] are left floating, EEPROM is not used and the hardware register default settings are loaded. Table 10, Table 11, Table 12, Table 13, and Table 14 show the predefined EEPROM configurations according to the GPIO[3:2] pin settings."

2-1.Is it correct that  "hardware resister default settings" is Table 15,16(Default ROM Contents)?

2-2. Is it correct that Table10~14’s contents is the stored value at time of shipment and loaded setting when latched in the Soft pin Programming mode? 

it would be great if you could let me know your thoughts on the following questions.

Best regards,

Y.Ottey

  • 0
    TI__Genius 11900 points
    Hello Ottey,

    1) In soft pin mode GPIO2 and GPIO3 select which EEPROM setting is loaded into the device. The device must startup with the setting being used. For example, if I want to have my device operate according to EEPROM page 3, I would set GPIO3 to high and GPIO2 to low at startup.

    2.1) No. "Table 15, Table 16, Table 17, Table 18 and Table 19 show the pre-defined ROM configurations according to the GPIO[5:0] pin settings." These can be powered up using hard-pin mode.

    2.2) Yes, these are the stored values at the time of shipment. "Table 10, Table 11, Table 12, Table 13, and Table 14 show the predefined EEPROM configurations according to the GPIO[3:2] pin settings."
  • 0 in reply to Vibhu Vanjari
    Mastermind 6145 points

    Hi Vibhu.

    Thank you for your reply.
    Our customer would like to ask more questions about LMK03328's EVM.

    ※LMK03328EVM Datasheet
    www.ti.com/.../snau184.pdf

    1. If we select "Register Default Mode"(GPIO3=MID,GPIO2=MID),How is this supposed to be used?

    2. It says " Loads all registers from the register default setting."in "3. Register Default Mode" of "3.Modes of Operation" in LMK03328EVM Datasheet p.7. Does this refer to all registers of LMK03328 as Rxxx?
    If this answer is "Yes", Please tell us registers that execute updating stored value in LMK03328.

    it would be great if you could let me know your thoughts on the following questions.

    Best regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Genius 11900 points

    Hello,

    Register default mode is a default frequency plan that is activated when GPIO3 = MID and GPIO2 = MID. These may not be the frequencies that the customer needs (highly unlikely).

    Yes, the register values on the chip are updated to set the registers up for default configuration. You can view this configuration on the TICSPro software and going to Default Configuration->EVM Default. The frequencies generated are 312.5, 312.5, 156.25, 156.25, 212.5, 212.5, 106.25, 106.25.