Userguide

5
POWER REQUIREMENTS
In order for the watchdog to cycle the power to Raspberry Pi, +5V power needs to be supplied only to
the watchdog. The watchdog has two power connectors: USB connector on bottom and 2.1mm barrel
connector on top. The USB connector can supply up to 1.5A, while the barrel connector up to 2A. If your
Raspberry Pi system requires more than 2A, you need to supply power to both connectors.
If the 5V power supply fails, the watchdog switches the power supply to battery. When running on
battery, the current supplied to Raspberry Pi is limited to 1.5A. Actual current drawn from battery will
be about twice the current supplied to Raspberry Pi.
SPECIFICATIONS
Watchdog current consumption: 10 mA @ +5V
Maximum switched power to Raspberry Pi: 3.5A
Battery charging current: 400mA
Maximum Raspberry Pi current supply: 3.5A
Raspberry Pi current supplied from battery: 2.0A (up to 10 seconds)
Raspberry Pi current until battery discharge: 1.5A