SetZero / ARMband

STM32MP1 based smartwatch
MIT License
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Check connections on battery, connectors and peripherals #1

Closed Ihysol closed 1 year ago

Ihysol commented 1 year ago
  1. check gas gauge connections a. pullups are connected to 3v3 from BUCK. So the Battery needs to function first, in order for the PMIC and hence, the pullups to work. b. shunt resistor value is TBD

  2. check Li-Ion charging connections a. led footprint TBD b. check R_prog calculation (currently 1k == 1000mA)

  3. check connectors a. usb connector/pogo pins supply VIN directly (charging input for Li-Ion charger) b. connect shield through resistor to GND? c. CC and other communication pins from USB-C not needed?

Ihysol commented 1 year ago
  1. a. closed

    • Battery will be charged through connectors
    • Once bat voltage is sufficient (should always be or battery dead) the buck will start to work. So it should always work, if a battery is connected and not malfunctioning.
    • pullups are only for alert and not general function. So this should not impact functionality of other parts.
  2. b. closed

    • still to do, moving to new issue
  3. a. closed

    • led footprint still to be done, moving to new issue
  4. b. closed

    • charging current is 1A atm. should be double checked with the battery we're going to use in the future
  5. a. closed

    • schematic changed and issue is obsolete.
  6. b. closed

    • should be fine without resistor
  7. c. closed

    • schematic changed and this issue is obsolete