Datasheet

MPLAB

STARTER KIT FOR

INTELLIGENT.INTEGRATED.ANALOG

USER’S GUIDE

 2013 Microchip Technology Inc. DS50002172A-page 29

Chapter 4. Troubleshooting

This chapter discusses common operational issues and how to resolve them.

1. The demo application does not run.

The Starter Kit board must be plugged into a powered USB hub, computer or other USB

host device. Start by plugging into the USB device port, J2. LED, D4, should light when

BUS is detected.

If D4 is not lit, verify that the USB host side port is functional.

Verify that there is a jumper in the USB position on J10.

2. The temperature sensor does not provide a reading or does not read

correctly.

Verify that a jumper is installed at JP7.

3. The Starter Kit is not recognized as a COM port device when it is

connected.

The virtual COM port is only available when the Starter Kit is connected through the

device port (J2).

Be certain to launch the terminal software only after the Starter Kit has been powered

up and the demo application is running. If the terminal program is started first, it will not

see the Starter Kit.

4. The light sensor’s voltage saturates under some bright light conditions.

The voltage generated by Q1 is set by resistor, R11. The default value is 27 kΩ. If your

ambient light is bright (over 500 lux), try lowering the value of R11 to 15 kΩ.