User manual

Getting Started
 2011 Microchip Technology Inc. DS41614A-page 19
2.7 POWERING WITH A USB CABLE
To power with the USB cable, perform the following steps:
1. Make sure a jumper or an ammeter is connected across J4.
2. The USB cable will supply 5V DC to the F1 LV Evaluation board. The MCP1703
converts the 5V to 3.3V supply voltage for the PIC16LF1947.
3. Populate the USB PWR jumper, J8.
FIGURE 2-6: USB POWER
2.8 DEFAULT FIRMWARE
The default firmware supplied with your F1 LV Evaluation Board Demo performs the
following functions:
1. Blink LEDs
2. Measure the ambient temperature
3. Run an attached add-on board motor (the firmware will auto-detect the add-on
motor type, or indicate if no add-on board is attached.)
4. Display time/temperature/pot position/motor RPM on the LCD
5. User interface with a button and pot
For the latest firmware go to www.microchip.com/F1
LVEval
2.8.1 Blinking LEDs
LED RA4 is used to indicate timing of the demonstration main loop. The LED toggles
at each cycle through the demonstration program main loop. LEDs RA6, RA7 and RC5
are add-on board dependent, their function will change depending on the add-on board
attached.
2.8.2 Measuring the Ambient Temperature
The MCP9800 is polled when in Temperature Measurement mode. The measured
temperature is filtered, scaled to either Centigrade or Fahrenheit and displayed on the
LCD.