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Documentation Index

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Power Management for Glyph S3

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Battery + USB Power

We designed the Glyph S3 to be easy to power both when connected to a computer and via a battery. Here are the ways to power your Glyph:
  1. USB Power: Connect with a USB cable to regulate the 5V USB down to 3.3V.
  2. Battery Power: Connect a 4.2/3.7V Lithium Polymer (LiPo/LiPo) or Lithium Ion (LiIon) battery to the JST jack for rechargeable battery power.
When USB power is connected, it will automatically switch over to USB for power and start charging the battery (if attached). This hot-swap functionality allows you to keep the LiPo connected as a backup power source that will only be used when USB power is lost.
Install the LiPo / Li-ion batteries based on the polarity. Using wrong polarity batteries can destroy your Glyph.

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Power Supplies

The Glyph S3 offers multiple power supply options:
  • BAT Pin: Connected to the battery pads (behind the board)
  • USB Pin: Provides +5V from USB if connected.
  • 3V Pin: Provides output from the 3.3V regulator with a 600mA peak output.

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Measuring Battery Voltage

To monitor battery voltage, short the msr pads behind the board.

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Alternative Power Options

For powering the Glyph S3:
  • USB powered: Use a 5V 1A USB wall adapter to plug in a USB cable for reliable power.
  • Portable Use Without LiPo: Use a USB battery pack(Power Bank).
  • Higher Voltage Power Supply: Use a 5V buck converter and wire it to a USB cable’s 5V and GND input.
What You Cannot Do
  • Do not use alkaline or NiMH batteries and connect to the battery port, as it will destroy the LiPo charger.
  • Do not use anything >4.2v LiPo batteries on the battery port, as it will destroy the board.

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External Power Supplies

The Glyph S3 is not designed for external power supplies. If you must:
  • Connect an external 3.3V power supply to the 3V and GND pins
  • Connect an external 5V power supply to the USB and GND pins.