DA9062 Review and Questions

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sametron90
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DA9062 Review and Questions

Hi,

I have attached herewith the schematic and here is the list of parts used in the schematic:

  • 0.1uF, 100nF:GCM155R71H104KE02J
  • 4.7K: RC0402FR-074K7L
  • 22uF: GRT31CR61E226ME01L
  • 12pF: GRM1555C1H120JA01D
  • X2 (32.768KHz): XDBCHLNDDD-0.032768 (Datasheet attached)
  • 2.2uF: GRM155R61C225KE11J
  • 470nF: GRT155R61C474ME01D
  • BAT2: MS621FE-FL11E
  • 200K: RC0402FR-07200KL
  • 110K: RC0402FR-07110KL
  • 10K: RC0402FR-0710KL
  • 1uH: SRP2512A-1R0M
  • 47uF: GRM21BR61A476ME15L
  • We have some questions:

    Design implementation questions:

  • Need confirmation if all the passives used are approved?
  • If we move the 1V8 to LDO 2 & 3, how much would be the total power dissipated across the LDO when having a load of 400mA and an I/P voltage of 5V.
  • Need confirmation if the crystal and load capacitance values used are approved?
  • Is the section used for programming DA9062 implemented properly?
  • Is the battery implemented correctly? Is there any specific code or pin configuration we need to follow to enable charging? Do we really need the 470nF parallel to the battery?
  • Can we program any of the GPIO to give a power good signal O/P? Open Drain (active high) output, which will be going to the FPGA, the signal transition would be from 0V to 3V3. Further, will it be possible to drive an LED with this pin, if so what is the maximum source current possible?
  • Can we use any of the GPIO to be an EN to turn on all the buck and LDO supply? If there is any specific pin on the DA9062 that can handle it, then it would be great. We can save a GPIO for future use.
  • As far as the existing WDT implementation, 1 chip (STWD100NYWY3F) that is controlled by pulling the /EN pin high to disable it during normal operation. When enabled the WDT triggers a POR after 1.6 seconds. We want a similar implementation using DA9062. Is there a specific pin on the chip that can be effectively used instead of using a GPIO (or) do we need to use the GPIO. If we need to use the GPIO, which one and just adding a pull-down external is enough? Here is the schematic section for the existing implementation:
  • Look into the attachment image: "STWD100NYWY3F"

  • As far as the RTC is concerned, we are using M41T62 for the current implementation. We need an interrupt to be generated from RTC, which will be programmed later by us. Is there a specific pin on the chip that can be effectively used instead of using a GPIO (or) do we need to use the GPIO. If we need to use the GPIO, which one? Here is the schematic section for the existing implementation:
  • Look into the attachment image: "M41T62"

    Device: