The Power Cape provides integrated UPS-style functionality by combining a lithium battery charging circuit with a buck/boost regulator. If DC power is insufficient or unavailable, the supply will be supplied by the lithium battery. When DC input is available, the battery will be charged to 4.2V. The cape also has an INA219 power monitor on the battery input so that voltage and charge/discharge rates can be monitored by software. An AVR microcontroller acts as a "power supervisor" and provides power up/down on user-definable events (DC power good, timeout, external signal, or cape button press).
Initial release of BeagleBone Power Cape
- Molex connector removed from opto-isolator so that it's not the same as the DC input connector.
- UART1_TXD and UART1_RXD resistors are de-populated. These signals were tri-stated (available for other capes) on the A0.
- The cape now has access to the power button (PWR_BUT) and system reset (SYS_RESETn).
- An AndiceLabs Power Cape
- A BeagleBone Black or BeagleBone White
- A 5V DC power supply (recommended 5V @ 2A)
- A single-cell (3.7V) LiPo battery
|DC input voltage||5VDC to 14VDC|
|Cape supplied power on DC||5V @ 2A to BeagleBone|
|Cape supplied power on battery||5V @ 1.2A to BeagleBone|
|Battery charge current||350mA typical|
|Battery charge timeout||3 hours typical|
|Battery full voltage||4.2V|
|System quiescent power draw on DC input||1.2mA typical|
|System quiescent power draw on battery input||75uA typical|
|Indicators||2 green LEDs controlled by ATmega328p|
|DC Power Input||Molex MicroFit3 connector|
|Battery Input||JST PH (found on AdaFruit and SparkFun LiPo packs)|
|External Signal Input||Right-angle MTA-100 connector|
The BeagleBone Power Cape uses the following signals:
- PWR_BUT (A1 only)
- SYS_RESETn (A1 only)
|System Reference Manual||In progress|
To go back to the cape list, please click BeagleBone Capes