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TPS659128: How to use PMIC

Satoshi Okamoto
Intellectual 505 points
Part Number: TPS659128


Tool/software:

I plan to use the TPS659128.
I have some questions about the datasheet.

Q1
There is a difference between the VIN of 6.3 and the VIN of 6.5/6.6.
Which one is correct?
6.3: VIN=2.7 to 5.5V
6.5/6.6: VIN=2.3 to 5.5V

Q2
Please tell me how to handle each signal when it is not in use.
We are not planning to use DCDC in our system.

Best regards
- satoshi

plan (動) 計画する、予定する、考える、画策する、企画する、企む、考案する

plan (名) 予定、計画、プラン、構想

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  • 0
    TI__Genius 11917 points

    Hi Satoshi, 

    [Q1] It is best to follow the recommended specifications of VIN in section 6.3, VIN = 2.7 to 5.5 V.

    Sections 6.5/6.6 states that the minimum operational VIN is 2.3 V. However, it is recommended to be at least 2.7 V since this is the voltage monitoring (VMON) threshold.

    [Q2] It is strongly advised to still use the DCDC in your system.
    This device has not been tested with the DCDC unused, so behavior is unexpected. You could try the following connections, but this has not been tested.

    Typically for an usued buck, the connections would be:

    • VINDCDCx should still be connected to VIN source
    • SWx pin can be left floating
    • VDCDCx should be connected to GND
    • VDCDCx_FND should be connected to GND
    • PGNDx should be connected to GND.

    It is also important to make sure that the bucks are disabled in the I2C registers. The ENABLE bit of the respective DCDCx_AVS should be set to 0.

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Intellectual 505 points

    Hi Sarah,

    Sarah's response provided useful information !

    In the reference circuit, VINDCDCx was connected to GND.
    I was unsure how to leave it unused.

    Is there any information on what to do with each pin when it is unused?
    I would like to decide what to do with the pins other than DCDC.

    Best regards
    - satoshi

    Sarah (名) セイラ

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  • 0 in reply to Satoshi Okamoto
    TI__Genius 11917 points

    Hi Satoshi, 

    Unfortunately, there is no other documentation for TPS659128 other than the datasheet. 
    The TPS65912xEVM-081 User Guide may be a helpful reference.

    May I know what pins other than DCDC you are specifically wanting to leave unused?

    Best Regards, 

    Sarah

  • 0 in reply to Sarah Lao
    Intellectual 505 points

    Hi Sarah,

    The pin in the attached file is going to be unused.
    Could you please tell me how to deal with it if it is unused?

    Best regards
    - satoshi
    TPS659128.xlsx

  • 0 in reply to Satoshi Okamoto
    TI__Genius 13860 points

    Hi Satoshi-san,

    US in on public holiday 17th of Feb. They will come back to you next business day. 

    Br, Jari

  • +1 in reply to Satoshi Okamoto
    TI__Genius 11917 points

    Hi Satoshi, 

    Please refer below to the recommended connections if the pins are left unused:

    Pin Name Pin Number Pin Type Connection if not used
    LSO_A8 A8 Output Leave floating
    LSO_A9 A9 Output Leave floating
    LEDC/GPIO5 B1 Bidirectional Leave floating
    LEDB/GPIO4 B2 Bidirectional Leave floating
    LEDA/GPIO3 B3 Bidirectional Leave floating
    LSI_B8 B8 Input Connect to GND
    LSI_B9 B9 Input Connect to GND
    EN_LS1 C2 Input Connect to GND
    EN_LS0 C3 Input Connect to GND
    GPIO2_CE C4 Bidirectional Leave floating
    NPWRON D3 Passive Tie to LDOAO pin (G3)
    GPIO1_MISO D4 Bidirectional Leave floating
    SCL_AVS/CLK_REQ1 E5 Input Leave floating
    SDA_AVS/CLK_REQ2 E6 Bidirectional Leave floating
    VCON_PWM F4 Input Leave floating
    VCON_CLK F5 Input Leave floating
    SLEEP/PWR_REQ G4 Input If CONFIG2 = 0 (PWR_REQ): pull up to VDDIO
    If CONFIG2 = 1 (SLEEP): connect to GND
    INT1 G5 Output Leave floating
    NRESPWRON/VSUP_OUT G6 Output Leave floating

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Intellectual 505 points

    Hi Sarah,

    I found an error in the reference circuit.
    Sarah's answer gave us the best results.

    Best regards
    - satoshi