ARM Technical Support Knowledge Articles

USE AS A SELF-POWERED USB DEVICE

Applies to: MCB2140 Evaluation Board

Answer

The MCB2140 power supply may be changed from a bus-powered USB device to self-powered mode enabling the SoftConnect feature of the LPC2148. SoftConnect is especially useful for devices that change USB functionality during runtime. USB debugging with uVision becomes easier because the firmware may be reset without unplugging the board.

HARDWARE CHANGES

Remove the following components:

Add the following components:

Additional information about the transistor: Philips PMBTA92

SOFTWARE CHANGES

P0.31 must be configured for SoftConnect as follows:

PINSEL1 |= 0x80004000;

SCHEMATICS

MCB2140 SoftConnect Schematic Modifications

MORE INFORMATION

Article last edited on: 2007-01-10 12:11:08

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