Datasheet

MPLAB
®
Starter Kit for Intelligent.Integrated.Analog User’s Guide
DS50002172A-page 18  2013 Microchip Technology Inc.
1.3.1 Power Sources
The Starter Kit can be powered in one of three ways, depending on the usage:
• PKOB USB Connector (J6). This will power the entire MPLAB Starter Kit board,
including the PICkit programming circuitry. Jumper, J10, must be placed into the
USB position (Pins 2-3), which is the default position. Both power LEDs (D4 and
D5) will light.
• USB Device Port (J3). In this mode, only those portions of the board driven by the
PIC24FJ128GC010 are functional; the PKOB is not powered. Jumper, J10, must
be placed into the USB position (Pins 2-3), which is the default position. Only
LED, D4, will light.
• CR2032 Coin Cell (not supplied). Only those portions of the board driven by the
PIC24FJ128GC010 microcontroller are functional; the PKOB is not powered.
Jumper, J10, must be placed into the BATTERY position (Pins 1-2). While
operating from a battery, the USB LEDs do not light.
1.3.1.1 SWITCHED_VDD CONTROL
In order to reduce power consumption of the Starter Kit, certain circuits can be powered
on or off by the microcontroller. This is controlled by port pin, RA9 (WAKE). Asserting
this pin (logic ‘1’) turns V
DD on to the following devices:
• MCP6022 headphone buffer (U3)
• Potentiometer (R7)
• TC77 temperature sensor (U8)
• Ambient light sensor (Q1)
• Precision voltage reference (U11)
• Electret Microphone (MK1)
• Optional wireless module (U2) (also is the WAKE function to the module)
When SWITCHED_VDD is off, power supply current is reduced approximately 3.5 mA
without the wireless module installed. Since the wireless module shares its WAKE pin
with the control line for SWITCHED_VDD, the module will not be able to go into Sleep
mode. Installing the wireless module adds approximately 21 mA of current requirement
whenever SWITCHED_VDD is asserted.
1.4 INSTALLING DEVICE DRIVERS FOR THE STARTER KIT
The USB mode firmware requires the generic Microsoft
®
WinUSB driver
(winusb.dll) to be in the directory, C:\\windows\system32. This driver should
already be installed on computers running Microsoft Windows. When the Starter Kit
board is attached for the first time, a notification window that drivers are being installed
may briefly appear.
When the drivers are properly installed, the Starter Kit will appear as a USB COM port
when plugged into the USB device port (J3).