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TPS65216: Power Sequencer

Brian Wang0928
Genius 12680 points
Part Number: TPS65216
Other Parts Discussed in Thread: TPS65126, , TPS6521905

Tool/software:

Hello Team,

Customer plans to use TPS65126 as a biasing power for Renesas RZT2M with RX65N(Communication chip) devices.

  • Power On Sequence : 1.1V -> 1.8V -> 3.3V
  • Power OFF Sequence: 3.3V -> 1.8V -> 1.1V

There're two questions here;

1. How does TPS65126 do the i2c programming on register for power sequencer design?

2. Below is a load table of MCU/FPGA/others, the loading currents are under TPS65216's max current. it should be ok, right?

Voltage Rail

TI-28377(Operation Current)

FPGA(Operation Current)

RZ/T2M (Max Current)

RX65N (Max Current)

Summary Current

0.9V

Not applicable

80mA

Not applicable

Not applicable

80mA

1.1V

Not applicable

Not applicable

660 mA (Core)

Not applicable

660mA

1.2V

450mA(Operational Mode)

Not applicable

Not applicable

Not applicable

450mA

1.8V

Not applicable

Not applicable

80mA (I/O)

Not applicable

80mA

3.3V

90mA(Operational Mode)

50mA

80mA (I/O)

80 mA

300mA

 

Application: Servo Drive

Regards

Brian

  • 0
    TI__Intellectual 2965 points

    Hi Brian, 

    1. The typical power-up sequence of TPS65216 is depicted below:

    The output rails (LDO1, DCDCx) are assigned a specific time slot, or "strobe" by the LDO1_SEQ/DCx_SEQ register, such that Strobe3 occurs after delays DLY1 & DLY2.
    The length of these time delays can also be programmed to be either 2 ms or 5 ms long, using the DLYx registers.

    Any writes to I2C must occur after device is powered, more information on timing requirements for I2C communication are in Section 4.6 of the datasheet.
    More information on writing to password-protected registers is also in section 5.5.1 of the datasheet.

    2. Yes the currents listed are well below the maximum output currents of the TPS65216. 
    Only concern would be to ensure LDO1 is being used for a rail with < 400mA. Else, this will be perfectly fine. 

    Let me know if anything needs more clarification.

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    TI__Genius 12680 points

    Thank you for your help,

    It looks It's okay to use RZ/T2M with RX65N with the TPS65216.

    But as it stands, Power Sequence has to be modified over the I2C communication interface after power up.
    Is there a chance to set up and programming specific Power Sequence at the factory site before silicon are ship out?

    That's because it can be a hassle if you have to power up and make programming every time.

    Regards

    Brian

  • 0 in reply to Brian Wang0928
    TI__Guru* 79943 points

    Hi Brian,

    Sarah is out today but will return to help on Monday. One other option to look at is the TPS6521905 - this device allows the customer to program the power settings and sequencing themselves or they can work with a 3rd party programming service. Many customers are using this options for new projects.

    It is not likely that a new version of the TPS65216 can be made, but you can reach out to the marketing engineer for this product to discuss further.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Intellectual 2965 points

    Hi Brian,

    I agree with Matt's answer above. The best way to avoid the I2C programming each time is to use a "user-programmable" device, like the TPS6521905 that enables them to alter the default settings, this way the preferred timing sequence is saved as the default setting.

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    TI__Genius 12680 points

    Thanks. For the TPS65216, You may have to reconfirm that the I2C can be burned from the TI factory Or maybe customer can burn it themselves once at their line end, and then customer can do it without needing to burn it again.

    For the TPS6521905, we'll consider of it and doing price estimation if it can be implement on new project or not!

    Regards

    Brian

  • 0 in reply to Brian Wang0928
    TI__Intellectual 2965 points

    Hi Brian, 

    Let me clarify.
    The TPS65216 is not able to be burned with the custom values by the factory nor the customer.
    The device will come with the default sequence programmed as shown in the datasheet, and any changes written to I2C are temporary and the register values will reset upon power cycle. 

    However, for TPS6521905, the register values can be programmed and burned by customer/ a third-party vendor, and this way, the I2C is not necessary.
    And custom voltage/timing values can be set by the customer.

    If using the TPS65216, then they will have to use the I2C to write after power up each time.
    Let me know if there is still more questions.

    Best Regards, 
    Sarah