User manual

 2015 Microchip Technology Inc. DS40001812A-page 33
EXPLORER 8 DEVELOPMENT BOARD
USER’S GUIDE
Appendix A. Hardware Details
A.1 HARDWARE ELEMENTS
A.1.1 Processor Sockets
The Explorer 8 Development Board contains four processor sockets:
• 20-pin Socket – for 8/14/20-pin DIP microcontrollers
• 28-pin Socket – for 28-pin DIP microcontrollers
• 40-pin Socket – for 40-pin DIP microcontrollers
• 84-pin PIM Socket – for 44/64/80-pin PIM-mounted microcontrollers
Only one device may be used at a time. Remove unnecessary devices before
demonstrating your program.
For a complete list of 8-bit PIC microcontrollers and available PIMs, go to the Microchip
web site at www.microchip.com.
A.1.2 Display
Eight blue LEDs (D8:D1) are connected to the <RB3:RB0> and <RD3:RD0> pins of
each processor type, respectively. These pins are set high to light the LEDs.
LEDs D8:D5 may be disconnected by removing jumper J21 while LEDs D4:D1 may be
disconnected by removing J7.
D5 lights up once J21 is attached because RB0 is also connected to switch SW1 and
this pin is always pulled up to V_VAR.
A.1.3 Power Supply
The Explorer 8 Development Board does not come with a power supply but it comes
with a micro USB cable for powering the board via USB. Using USB power, however,
limits the supply to only 100 mA. Using the 9V external supply, both 3.3V and 5.0
supplies are capable of up to 1A. Microchip’s 9V, 1.3A power supply (Part Number
AC002014) can be used if external supply is needed. When using an external supply,
the board is limited to a maximum of 5A, imposed on the breadboard contacts.
The board is populated with two fixed (U5 and U1) and one variable (U2) voltage
regulators to provide 5.0V, 3.3V and any voltage between 1.2V and 5V.
Note: For power supply selection, see Section 2.5 “Powering the Board” and
Section 2.6 “Selecting Vdd Values”.