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Powering F28377S with battery power

Hac Le
Intellectual 670 points
Other Parts Discussed in Thread: CONTROLSUITE

In my application, I have to provide uninterrupted power to the F28377S board and battery seems to be my best choice. Does F28377S design allow external power supply? My best guess is that I have to provide a 3.3V and GND to the GREEN area and remove the pins in YELLOW area. Please comment on this. 

  • 0
    Guru 192875 points
    Hi Hac,

    You can refer to this link: e2e.ti.com/.../1858205

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Intellectual 670 points

    Hi Gautam,

    Sorry for digging this up, but I have conceived an evil plan to use the F28377S Launchpad  on-board regulator like below. Please take a look and please comment whether it could work or not:

  • 0 in reply to Hac Le
    Guru 192875 points
    It will work but what about the controller on the launchpad? Are you planning to remove that? If not then you need to know the current consumption of that part.
  • 0 in reply to Gautam Iyer
    Intellectual 670 points

    Hi Gautam, my aim is to power the controller so I won't remove it. The maximum power consumption on the 3.3V rail is about 300 mA for F28377S and about the same current consumption with the 5V rail as the link you suggested stated. Therefore, I think that I could deliver a total of 600 mA at the miniUSB port and the on-board regulator takes care of the rest.

    However, I'm curious to know the total current consumption required at the miniUSB port.

  • 0 in reply to Hac Le
    Guru 192875 points
    Understand... and what is the current requirement of the external hardware that you plan to attach on these rails?
  • 0 in reply to Gautam Iyer
    Intellectual 670 points

     Hi Gautam, may be this picture will explain better what I'm trying to achieve. I want to power the Launchpad itself and an ESP8266 module. 

  • 0 in reply to Hac Le
    TI__Guru 60865 points
    Hi Hac Le,

    I think what you want to do is download ControlSUITE and then find the schematics for the F2837x Launchpad. From there, find all the components that are connected to the 5V or 3.3V rail. For each of these components, you need to find the current consumption specified in the device datasheet. Now add together all the maximum currents to get the total board maximum current draw (or add the typical currents to get the total typical board current draw).

    Really though, the vast majority of the current will be consumed by the F2837x device. A good first level approximation would be to check the current consumption for the F2837x device in the F2837x datasheet.

    Note that the F2837x is powered by both a 3.3V rail and a 1.2V rail. The board therefore also probably has a 3.3V->1.2V LDO.