• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 20 subscribers
  • Views 765 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMX2430 reduce the power consumption

cafain
Mastermind 6765 points
Other Parts Discussed in Thread: LMX2430

Hi

I have a question about LMX2430.

We will order to reduce the power consumption, to be used only IF circuit.

If you do not use the RF circuit, please tell me the terminal processing related to RF.

Is not used RF PLL GND(11 & 13pin ULGA) and RF PLL Vcc(8 & 16pin ULGA).
This terminal you sure you want the OPEN at that time?

Is it good in the OPEN FinRF(13 & 14pin ULGA) ?

If you want to know only IF circuit,
Are you sure you want be realized by powering to IF PLL GND(1pin ULGA) and IF PLL Vcc(20pin ULGA)?

Best regards

  • 0
    TI__Mastermind 28021 points

    Cafain,

     

    If you are not using one side, then:

    1. Power down the unused side in software.  It will not draw any current.

    2.  Do NOT ground any outputs

    3.  Leave FinRF open is fine, but it is powered downanyways.

    4. 

    Regards,

    Dean

  • 0 in reply to Dean Banerjee
    Mastermind 6765 points

    Hi.

    Your answer, I would like to thank.
    It is a question of additional.

    Q1:
    When not using the RF circuit, or no problem in the (OPEN) not connected all power terminals?
    (9pin,12pin,14pin,17pin ⇒ No commented Power Line(OPEN))?

    Q2:
    When not using an RF circuit, please tell me the Pin treatment CPoutRF, FLoutRF, FinRF, and FinRF*.

    Q3:
    Vcc power-up after application, How long is the time to serial data input?
    (The time it takes data input from Power-up)

    Best Regards.

    Cafain

  • 0 in reply to cafain
    TI__Mastermind 28021 points

    Cafain,

    Q1:

    You MUST connect the power supply pins,even if you think they are not connected.   It does not save current by not connecting them.  The datasheet description of the power supply pins gives the main functional blocks it supplies, but there are other blocks not mentioned and some pins may be shared.   Again DO NO leave these VCC pins floating;  connect them to the supply.  They will draw minimal (i.e 1 uA) current.

    Q2:

    These are all output pins, so it is best to just leave them open. DO NOT ground them.  They will not oscillate because the RF side should be powered down.  The programming bit RF_PD (R1[23]) can be set to zero that powers down all these pins.

    Q3:

    Our actual device is very fast (in the us) range.  However, gives some time for this because the bypass capactors that you have can cause the supply voltage at the pins to lag the supply voltage.

     

    Comment:

    The EN pin can be used to control the powerdown state of the device, irregardless of the programming state.   Before the device is programmed, the register states are random and the device may draw current as well as the RF PLL supply pins.

     

    Regards,

    Dean

  • 0 in reply to Dean Banerjee
    Mastermind 6765 points

    Hi . Dean-san

    I appreciate it

    Try to experiment.
    Thank you