Powering the Macrocontroller
|WARNING:||Be sure to take appropriate Electrostatic Discharge (ESD) precautions. Disconnect the power source before moving, cabling, or performing any set up procedures. Inappropriate handling may cause damage to the board.|
Using one of the "off the shelf" baseboards, be sure to refer to that baseboard's manual here. Different baseboards use different power connectors, voltage ranges, and may have different power requirements.
The macrocontroller only requires a 5V rail from the baseboard which may be regulated from other voltage ranges. Refer to the #TS-Socket Connector section for the POWER pins. While operating the board will typically idle at around 350mA@5V with the PXA166 or 450mA with the PXA168, but this can vary slightly based on your application. For example, every USB device can consume up to 500mA@5V. The ethernet interface can draw around 50mA while the interface is up. Every DIO pin can source up to 12mA from the FPGA. A Sandisk SD card can draw 65mA@3.3V during a write, and larger cards can consume more. A typical power supply for just the macrocontroller will allow around 1A, but a larger power supply may be needed depending on your peripherals.