DM163010 Microchip Technology, DM163010 Datasheet - Page 55

• Manufacturer Part Number: DM163010
• Description: BOARD DEMO PICDEM USB
• Manufacturer: Microchip Technology

Specifications of DM163010

• Processor To Be Evaluated: PlC16C745/765
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

©
5.1
5.2
5.3
2001 Microchip Technology Inc.
Introduction
Highlights
FAQ
5.3.1
5.3.2
Chapter 5. Troubleshooting
This chapter describes some common problems associated with using
PICDEM™ USB and steps to follow to resolve those problems. It also
includes frequently asked questions (FAQ’s) associated with using PICDEM™
USB.
Highlights covered in this chapter:
Hardware Questions
Q: Should I connect V
A: NO, these are completely different voltages. V
intended to source power to pull-up resistors on D+ or D-. V
supply, intended to power the entire circuit board.
Q: Ok, but can I leave the 220 nF capacitor off of V
A: NO, this capacitor is required to stabilize the V
copy the circuit as drawn in the data book.
PC/Windows Questions
Q: When I made a descriptor change, why is Windows still showing my
old description?
A: Windows stores most of the descriptor information in the registry. It then
makes the assumption that devices with the same vendor and product ID
have the same descriptor and will load the old descriptor from the registry.
This may be fine for consumers, but engineers require different behavior.
Before you enumerate with a new registry, simply use regedit to delete all
old entries about your device from the registry. If this is slowing you down, use
a Macintosh to develop the device descriptors and then switch to Windows to
develop the actual application code. The Macintosh does not have a perma-
nent device registry and rereads all the information every time.
• Common Problems
• FAQ’s
PICDEM™ USB User’s Guide
BUS
to V
USB
?
USB
USB
is a 3.3V power supply,
voltage. Make sure you
USB
?
BUS
DS41174A-page 51
is a 5V power