PICDEM Lab II Development Board Layout and Schematic Information Sheet

The PICDEM™ Lab II Development Board Layout
and Schematic Information Sheet
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The PICDEM™ Lab II Development Board Layout and Schematic can be found on the
Microchip web site:
This board provides hardware design flexibility for experimentation through a variety of
DIP microcontroller sockets coupled with a solderless breadboard. It also includes two
fixed and one variable power supply, plus a USB to Serial/I2C™ converter. Additionally,
it features a USB mini-B connector, two open format connectors (one for expansion, one
for an LCD module), and a pair of mikroBUS™ host connectors to accommodate a
variety of plug-in modules. The PICDEM Lab II is fully compatible with MPLAB® Code
Configurator and MPLAB® X v3.05 or later.
Board Power-Up
On-board power consists of two fixed voltages and one variable voltage. The two fixed
voltages are 5.0V and 3.3V and the variable supply can produce 1.2V to 4.5V. All three
power supplies can be powered from the 9V barrel connector, the USB voltage from the
USB-Serial/I2C™, or supplied via four test points (TP1 and TP2 for 5V, TP3 and TP4 for
Using USB power, the 3.3V and 5.0V supplies are limited to 100 mA. Using the 9V
supply, both 3.3V and 5.0V are capable of 0.75A. Using external supplies, the board is
limited to the external supplies limit, however, a maximum of a 3.0A to 5.0A limit is
imposed on the breadboard contacts.
Out of the Box Labs
A complete selection of parts and wires for four individual labs are included with the
PICDEM™ Lab II board:
• A Hello World LED Project
• An IR Remote Control Link
• A Power Converter Project
• A Class D Audio Amplifier
The lab manuals and additional labs are available on the Microchip web site:
Microchip Technology Inc. • 2355 West Chandler Blvd. • Chandler, AZ 85224-6199
The Microchip name and logo, the Microchip logo, and MPLAB are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries. All other trademarks mentioned herein are property of their respective
companies. © 2015, Microchip Technology Incorporated, Printed in the U.S.A. All Rights Reserved. 06/15
The recommended wire diameter for the white breadboard is AWG 22-29.
Board Layout
The PICDEM™ Lab II Development Board is shown in Figure 1.
The 28/40-pin socket, the 8/14/20-pin socket, the 18-pin socket and 8-pin socket are
provided for connecting DIP package microcontrollers to the corresponding ICSP™
programming/debugging connectors ICSP4, ICSP3, ICSP2 and ICSP1.
Jumpers 2 and 6 control the source of the 3.3V and 5.0V input.
The PICDEM™ Lab II Development Board Layout
and Schematic Information Sheet
If both jumpers connect the center and the top contacts (toward the 9V input), the 3.3V
and 5.0V are supplied by a pair of 1A switching regulators driven by the 9V input. If both
jumpers connect the center and the right contacts (toward the Click™ board
connectors), the 3.3V and 5.0V are supplied by the external power supply test points
(TP1/2 5.0V, TP3/4 3.3V; red test points are positive connections and black are
negative). If both jumpers connect the center and the bottom contacts, the 3.3V and
5.0V are supplied from the USB-Serial/I2C.
The blue potentiometer R7 adjusts the variable power supply voltage and is capable of
supplying maximum 100 mA.
J4 is a PICkit™ serial style connection for Serial/I2C. This device will enumerate as both
an I2C peripheral and a COM port on a PC.
A driver is required for the I2C™ operation, which can be downloaded,
along with a terminal program, from the Microchip web site:
USB to I2C™/
ICSP™ Connectors
sockets: 40, 28,
20, 18, 14, 8, 6
5.0V & 3.0V
Power supplies
USB Header
voltage control
Power Switch
and 9VDC
Power connections
Power select
Host connectors
LCD Module Connector
An additional USB Mini-B socket J17 is available through connector J22 for
microcontrollers capable of supporting a USB interface. Connectors J5 and J8 provide
GND, variable voltage, 3.3V, and 5.0V supplies.
Two Click™ boards may be loaded into the sockets and wired individually to any of the
microcontrollers. Power and ground for the Click™ boards are supplied through
existing connections to the sockets.
Connectors J9/10 and J11/16 are provided for connecting external boards, LCD
modules or wires.
Only VSS is connected to the microcontroller DIP sockets, VDD must be
supplied from the appropriate power supply voltage, see connectors J5
and J8 above.
Additional Recommended Equipment and Software:
PG164130 PICkit™ 3 Programmer/Debugger
DV244005 REAL ICE™ Programmer/Debugger
MCC MPLAB® Code Configurator
MPLAB® XC Compilers