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TPS650864: Power management forum

Part Number: TPS650864

hello

the datasheet said 

8.10.1 CTLx Sequencing
The device has six control-input pins (CTL1–CTL6) to control six SMPS regulators, three LDO regulators,
and three load switches. This allows the user to define up to six distinctive groups, to which each VR can
be assigned for highly flexible power sequencing. Of the six CTLx pins, CTL3 and CTL6 can be configured
alternatively to active-low sleep enable pins. For instance, if a system level SLEEP state is defined such that
BUCK1 output regulation voltage is lower than in the normal mode, then BUCK1 SLEEP state can be assigned
to CTL3 or CTL6. By being pulled low, either CTL3 or CTL6 can be used to put BUCK1 into SLEEP state,
and BUCK1 will regulate its output at a voltage defined by BUCK1_SLP_VID[6:0] in Section 8.13.23. For a
demonstration of this feature, Figure 8-24 shows how BUCK1 is enabled from the CTL1 pin.

but how to define those VR groups? I could not find the corresponding registers, we plane to use  TPS6508640, and there is a example as follows.

ddr_en -> ctrl1

ddr_sel->ctrl2

Main_sequence -> ctrl3

VCCINT_PG ->ctrl4

VTT_EN->ctrl5

BUCK2_SEL ->ctrl6

but where are those controls from? can I use MIOs of ZU MPSOC to genertate these signal?

  • Hi Xiao,

    For the TPS6508640, the CTLx settings are fixed in the 0x38 address. The registers in this address are set to work with the processor attachments in the picture you shared and we do not recommend changing them. 

    For custom programs, I recommend using the TPS650861. This PMIC would allow the user to create custom CTLx sequences.

    The CTLx signals are usually handled by an external host or SoC before main power is available. The controlling device will need to be be able to pull CTLx pins above 1.2V to ensure active high enable.

    Regards,

    James