Portable Power for PropellerQuickstart board?
I have an application that requires battery power for a QuickStart board---40000, Revision B. I have 3V and 6V battery power available.
Applying +6V power alone (no USB signals) to the QuickStart board through the USB socket's power pins does not work. The Parallax designer has used the CBUS-0 and the CBUS-3 output pins from the FTDI231 USB-interface chip to control the current flow through the AP1117 voltage regulator. I have no insight into why the designer did this. The QS board has a Vin connection that goes directly to the voltage-regulator IC. This signal also goes to pin 40 on the 40-pin interface board, so that might provide a work-around; that is, apply 6V to the Vin pin. But before I apply 6V to the Vin contact I'd like to hear from someone at Parallax--or someone with experience battery powering the QS board.
I still need an operating USB interface so people can do field updates of software.
Any ideas are greatly appreciated. Thanks. --Jon