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TPS65311-Q1: LPM Clock, SMPS Clock

Kuramochi Tadahiko
Guru 28715 points
Part Number: TPS65311-Q1

Hi,

The LPM Clock is shown on the datasheet.

What does it mean?

And does the SMPS clock mean the clock operating each SMPS?

Best Regards,

Kuramochi

  • 0
    TI__Expert 5650 points
    Hi Kuramochi,

    Your question has assigned to expert responsible for this product.

    Best regards,
    Jari Niemelä
  • 0 in reply to Jari Niemela13
    TI__Expert 8730 points

    Hi Kuramochi-san,

    Basically we have two different clock domains: one is lpm clock domain and another is main oscillator domain. LPM clock domain is mostly related to monitoring  functions of the device and main oscillator (SMPS clock) is used for generating clocks for each regulators. Yes, SMPS clock is the clock for each device regulation.

    Hope this helps you.

    Regards,

    Murthy

  • 0 in reply to Krishnamurthy Hegde
    Guru 28715 points
    Murthy-san,

    I have additional questions.

    1. About SMPS CLK, how much is the freqency of SMPS/LPM CLK?
    2. How is SMPS CLK frequency related to each DC/DC block?
    And How is LPM CLK frequency related to each monitor block?
    3. Could you show me the SMPS/LPM block on the block diagram(Figure 15) of the datasheet?

    Best Regards,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Expert 8730 points
    Hi Kuramochi-san,

    See my comments below.

    1. SMPS oscillator has 4.9 MHz frequency and this is used to generate clocks for device regulation related circuits and watchdog.
    2. LPM clock has 500 KHz and it is used for State machine, SPI, EEPROM control, monitoring related circuits.
    3. LPM/SMPS clocks are not shown in the datasheet block diagram as they are internal to the device.
    4. LPM clock and SMPS clocks are generated separately

    Regards,

    Murthy