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TPS65070: TPS65070

ASB
Intellectual 355 points
Part Number: TPS65070

I am using TPS65070 as PMIC for OMAP L138.  In my case I do not need battery or USB.  The only power source is through AC pin. Also I dont have external Push button to start power sequence.  My questions are following

How should USB pin and BAT1 and BAT2 pins should be connected?

How TS pin should be connected

  • 0
    TI__Mastermind 30280 points
    ASB,

    Short the BAT pins (5 and 6) together and pull them to GND through a 1-10kOhm resistor. Do not use a 10-uF capacitor.

    USB pin can be shorted directly to GND.

    TS pin can be left floating.
  • 0 in reply to Brian Berner
    Intellectual 355 points

    Thanks Brian, I have few more questions

    1- if RTC is not used do we need to provide voltage to RTC_CVDD pin

    2-  In my design the  DCDC2 and DCDC1 both are set to 3.3V can these voltage be ORed together or they have to kept separate?   

    3- Similarly DCDC3 and LDO2 are both at 1.2V  can they be Ored or tied together

    4- for non battery operated design, how should POWER_ON,  PGOOD, PB_IN , PB_OUT pins be connected and terminated?

      

    DCDC3 
    LDO2
    DCDC2 
  • 0 in reply to ASB
    TI__Mastermind 30280 points

    ASB said:
    1- if RTC is not used do we need to provide voltage to RTC_CVDD pin

    You can confirm with OMAP team. My advice is that it is safest to connect this rail in your schematic with the option to remove the connection it in assembly (0-Ohm resistor).

    ASB said:
    2-  In my design the  DCDC2 and DCDC1 both are set to 3.3V can these voltage be ORed together or they have to kept separate?

    They have to be separate. You should not wire-OR any DCDCs or LDOs together in any power design.

    ASB said:
    3- Similarly DCDC3 and LDO2 are both at 1.2V  can they be Ored or tied together

    They have to be separate. You should not wire-OR any DCDCs or LDOs together in any power design.

    ASB said:
    4- for non battery operated design, how should POWER_ON,  PGOOD, PB_IN , PB_OUT pins be connected and terminated?

    The recommended wiring of all these pins is shown in Figure 1 of this Application Note, Powering OMAP-L132/L138, C6742/4/6, and AM18x with TPS65070.

    POWER_ON can be pulled high to the main input voltage through a pull-up resistor.

    PGOOD is a useful output and should be wired to an MCU or the OMAP device.

    PB_OUT is useful during prototyping and should be wired to an MCU or the OMAP device.

    PB_IN should be wired to a test point if you don't want to include a physical push-button in the design. If you are having any issues during testing, "pressing" the push-button (pull PB_IN low) is a useful debug technique.