The Power Cape provides flexible power supply and control options by combining a lithium battery charging circuit with a buck/boost regulator. If DC power is insufficient or unavailable, the BeagleBone will be supplied by the lithium battery. When sufficient DC power is available, the battery will be charged to 4.2V whether the system is on or not. The cape also has an INA219 power monitor on the battery input so that voltage and charge/discharge rates can be monitored by software.
The on-board AVR microcontroller acts as a "power supervisor" and provides system power on user-definable events (DC power good, timeout, external signal, or cape button press). The AVR's firmware is field-upgradeable over the I2C bus. Additional functionality such as real-time clock (RTC) and watchdog functions are also provided by the power supervisor.
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